阅读说明：本技术 一种基于近红外光谱的土壤水解性氮的计算方法、预测方法和预测系统 (Near infrared spectrum-based soil hydrolyzable nitrogen calculation method, prediction method and prediction system ) 是由 李�杰 彭海根 王艳 黄果 王铎 喻曦 王戈 白羽翔 陈琼花 杨子孔 于 2021-09-23 设计创作，主要内容包括：本发明“一种基于近红外光谱的土壤水解性氮的计算方法、预测方法和预测系统”属于土壤检测技术领域。所述计算方法的特征是：采用下述公式I对目标区域的土壤的水解性氮的含量进行计算；公式I中,Y为目标区域的土壤的水解性氮的无量纲数值,x-(1)、x-(2)……x-(59)为目标区域的土壤的近红外光谱的特征波段的点数。采用本发明的方法和系统对土壤的水解性氮进行计算和预测,仅仅只需取样在近红外光谱仪下进行近红外光谱数据测定,不再需要进行任何化学实验、无需使用任何化学试剂,环保安全、方便快捷,值得广泛推广应用。(The invention discloses a method for calculating soil hydrolyzable nitrogen based on near infrared spectrum, a method for predicting soil hydrolyzable nitrogen based on near infrared spectrum and a system for predicting soil hydrolyzable nitrogen based on near infrared spectrum, and belongs to the technical field of soil detection. The calculation method is characterized in that: calculating the content of the hydrolyzable nitrogen of the soil in the target area by adopting the following formula I; in formula I, Y is a dimensionless number of hydrolyzable nitrogen in the soil of the target area, x 1 、x 2 ……x 59 The number of points in the characteristic band of the near infrared spectrum of the soil in the target area. The method and the system of the invention are adopted to calculate and predict the hydrolyzable nitrogen of the soil, only sampling is needed to carry out near infrared spectrum data determination under a near infrared spectrometer, no chemical experiment is needed, no chemical reagent is needed, and the method and the system are environment-friendly, safe, convenient and quick, and are worthy of wide popularization and application.)

1. A method for calculating soil hydrolyzable nitrogen based on near infrared spectrum is characterized in that the following formula I is adopted to calculate the content of hydrolyzable nitrogen in soil in a target area:

formula I:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉；

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂……x₅₉The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.

2. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum of claim 1, wherein the number of points in the characteristic band of the near infrared spectrum is:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Represents 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1Points of wave bandsCounting; x is the number of₂₃Represents 5385.358cm^-1The number of points of a wave band; x is the number of₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Represents 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1The number of points of a wave band; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

3. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum of claim 1 or 2, wherein the number of points in the characteristic band of the near infrared spectrum is the value measured by the near infrared spectrometer for the soil in the target area.

4. The method for calculating soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 1 to 3, wherein the soil hydrolyzable nitrogen is measured in mg/kg.

5. A soil hydrolyzable nitrogen prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉；

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂……x₅₉The number of points of the characteristic wave band in the near infrared spectrum data.

6. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to claim 5, wherein the number of points in the characteristic waveband in the near infrared spectrum data refers to:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Represents 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1The number of points of a wave band; x is the number of₂₃Represents 5385.358cm^-1The number of points of a wave band; x is the number of₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Represents 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1Of wave bandsCounting; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

7. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum of claim 5 or 6, wherein the near infrared spectrum data is a value measured by a near infrared spectrometer for soil in a target area.

8. The method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 5 to 7, wherein the soil hydrolyzable nitrogen is measured in mg/kg;

the soil is preferably tobacco planting soil.

9. A near infrared spectroscopy-based prediction system for soil hydrolyzable nitrogen comprising a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program, when executed by a processor, performs a method of calculating soil hydrolyzable nitrogen based on near infrared spectroscopy as claimed in any one of claims 1 to 4.

10. Use of the method for calculating soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 1 to 4, or the method for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to any one of claims 5 to 8, or the system for predicting soil hydrolyzable nitrogen based on near infrared spectrum according to claim 9 for detecting and screening soil.

Technical Field

The invention belongs to the technical field of soil detection, and particularly relates to a method for calculating soil hydrolyzable nitrogen based on near infrared spectrum, a method for predicting soil hydrolyzable nitrogen based on near infrared spectrum and a system for predicting soil hydrolyzable nitrogen based on near infrared spectrum.

Background

The tobacco planting soil is the foundation of the growth of the flue-cured tobacco, and the physical and chemical properties of the soil have direct influence on the growth of the flue-cured tobacco and are closely related to the yield, quality and style of the flue-cured tobacco.

Soil hydrolyzable nitrogen, also called soil available nitrogen, includes ammonium nitrogen, nitrate nitrogen, relatively simple amino acid nitrogen, amide and easily hydrolyzable protein nitrogen which are easily decomposed in part of organic matters. The soil hydrolyzable nitrogen is an important index for evaluating soil properties and is also an important influence factor of soil environmental conditions. The soil hydrolyzable nitrogen not only affects the soil biological activity, but also is closely related to the formation, transformation and effectiveness of soil nutrients and the growth and development of crops. The traditional soil hydrolyzable nitrogen determination method comprises an acid hydrolysis method and an alkali hydrolysis method. Acid hydrolysis is generally carried out by hydrolyzing with dilute sulfuric acid at a certain temperature, reducing nitrate nitrogen to ammonium with iron powder (or other reducing agent such as Darlington), oxidizing hydrolyzed organic nitrogen to ammonium with oxidant, and distilling to fix nitrogen. The alkaline hydrolysis method is further classified into an alkaline hydrolysis distillation method and an alkaline hydrolysis diffusion method. The alkaline hydrolysis distillation method is to use sodium hydroxide with certain concentration and a reducing agent to carry out alkaline hydrolysis and distillation for nitrogen determination in a distiller; the alkaline hydrolysis diffusion method comprises the steps of preserving heat of soil, sodium hydroxide solution and a reducing agent in a diffusion dish at 40 ℃ for 24 hours, simultaneously carrying out hydrolysis, reduction, diffusion and absorption, finally titrating with acid standard solution, and calculating hydrolyzable nitrogen, also called alkaline hydrolysis nitrogen. The correlation between the measurement result of the acid hydrolysis method on the low organic matter soil and crops is not ideal, and the two existing measurement methods are complex in measurement steps, long in measurement time, and unsuitable for large-scale rapid measurement requirements, and chemical reagents are required.

Therefore, there is a need in the art to develop a method and system for rapidly, efficiently and accurately predicting the hydrolyzable nitrogen in soil, particularly soil, without using chemical reagents.

Disclosure of Invention

Based on the blank of the prior art in the field, the invention provides a soil hydrolyzable nitrogen prediction method and system based on near infrared spectrum.

The technical scheme of the invention is as follows:

a method for calculating soil hydrolyzable nitrogen based on near infrared spectrum is characterized in that the following formula I is adopted to calculate the content of hydrolyzable nitrogen in soil in a target area:

formula I:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉；

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂……x₅₉The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.

The number of points of the characteristic wave band of the near infrared spectrum refers to:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Represents 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1The number of points of a wave band; x is the number of₂₃Represents 5385.358cm^-1Number of points in a band；x₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Represents 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1The number of points of a wave band; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

The number of points of the characteristic wave band of the near infrared spectrum is a value measured by the soil in the target area under the near infrared spectrometer.

The dimension of the soil hydrolyzable nitrogen is mg/kg. The meaning is as follows: 1kg of soil contains about mg of hydrolyzable nitrogen.

A soil hydrolyzable nitrogen prediction method based on near infrared spectrum is characterized by comprising the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉；

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂……x₅₉The number of points of the characteristic wave band in the near infrared spectrum data.

The number of points of the characteristic wave band in the near infrared spectrum data refers to:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Represents 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1The number of points of a wave band; x is the number of₂₃Represents 5385.358cm^-1The number of points of a wave band; x is the number of₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Representing 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1The number of points of a wave band; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

And the near infrared spectrum data is a value measured by the soil in the target area under a near infrared spectrometer.

The dimension of the soil hydrolyzable nitrogen is mg/kg.

A near infrared spectroscopy-based prediction system for soil hydrolyzable nitrogen comprising a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program is executed by a processor to execute the method for calculating the soil hydrolyzable nitrogen based on the near infrared spectrum.

The soil hydrolyzable nitrogen calculation method based on the near infrared spectrum, the soil hydrolyzable nitrogen prediction method based on the near infrared spectrum, or the soil hydrolyzable nitrogen prediction system based on the near infrared spectrum is used for detecting and screening soil.

According to the method, a large amount of soil is sampled and measured on site, soil near infrared spectrum data and original data of hydrolyzable nitrogen of the soil are obtained in a certain scale, a data sample library is formed, modeling processing such as fitting and inversion is carried out on the large amount of data by taking the soil infrared spectrum data as independent variables and the hydrolyzable nitrogen of the soil as dependent variables, 59 characteristic bands substantially related to the content of the hydrolyzable nitrogen of the soil are obtained by screening from the near infrared spectrum of the soil, and finally a relational expression of 59 band points of the near infrared spectrum and the hydrolyzable nitrogen of the soil is obtained. Based on the relational expression, the invention provides a calculation method, a prediction method and a prediction system for the content of the hydrolyzable nitrogen in the soil, and the content of the hydrolyzable nitrogen in the soil in the target area can be calculated only by sampling the soil in the target area, measuring the near infrared spectrum data of the soil and substituting the data into the relational expression.

The method utilizes the calculation method, the prediction method and the prediction system to sample the soil of a plurality of target areas and measure the near infrared spectrum data of the soil, respectively calculates and predicts the hydrolyzable nitrogen content of the soil of each target area to obtain predicted values, measures the actual content of hydrolyzable nitrogen in the soil, namely the measured value, by a large number of conventional hydrolyzable nitrogen measuring methods, finds that the difference between the predicted values and the measured values is not significant, and fully proves that the prediction method has extremely high accuracy in the aspect of predicting the hydrolyzable nitrogen content of the soil. Moreover, the method and the system of the invention are adopted to calculate and predict the hydrolyzable nitrogen of the soil, only sampling is needed to carry out near infrared spectrum data determination under a near infrared spectrometer, no chemical experiment is needed, no chemical reagent is needed, and the method and the system are environment-friendly, safe, convenient and quick, and are worthy of wide popularization and application.

Detailed Description

The following detailed description of the present invention is provided in connection with specific embodiments, but not intended to limit the scope of the present invention.

Group 1 example, method for calculating soil hydrolyzable nitrogen of the present invention

The group of embodiments provides a method for calculating soil hydrolyzable nitrogen based on near infrared spectroscopy. The present group of embodiments all have the following common features: calculating the content of hydrolyzable nitrogen in the soil of the target area by using the following formula I:

formula I:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂、x₃、x₄、x₅、x₆、x₇、x₈、x₉、x₁₀、x₁₁、x₁₂、x₁₃、x₁₄、x₁₅、x₁₆、x₁₇、x₁₈、x₁₉、x₂₀、x₂₁、x₂₂、x₂₃、x₂₄、x₂₅、x₂₆、x₂₇、x₂₈、x₂₉、x₃₀、x₃₁、x₃₂、x₃₃、x₃₄、x₃₅、x₃₆、x₃₇、x₃₈、x₃₉、x₄₀、x₄₁、x₄₂、x₄₃、x₄₄、x₄₅、x₄₆、x₄₇、x₄₈、x₄₉、x₅₀、x₅₁、x₅₂、x₅₃、x₅₄、x₅₅、x₅₆、x₅₇、x₅₈、x₅₉The number of points in the characteristic band of the near infrared spectrum of the soil in the target area.

In a specific embodiment, the number of points in the characteristic band of the near infrared spectrum refers to: and (3) measuring the spectral numerical value of the soil sample in the target area under the characteristic wave band in the infrared spectrum measured by the infrared spectrometer. The method comprises the following specific steps:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Representative 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1The number of points of a wave band; x is the number of₂₃Represents 5385.358cm^-1The number of points of a wave band; x is the number of₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Represents 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1The number of points of a wave band; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

In some embodiments, the number of points in the characteristic band of the near infrared spectrum is the number of points in the soil in the target region measured by the near infrared spectrometer.

In other embodiments, the soil hydrolyzable nitrogen is measured in mg/kg.

Group 2 example method for predicting soil hydrolyzable nitrogen of the present invention

The group of embodiments provides a soil hydrolyzable nitrogen prediction method based on near infrared spectroscopy. The present group of embodiments has the following common features: the method for predicting soil hydrolyzable nitrogen based on near infrared spectrum comprises the following steps: measuring near infrared spectrum data of the soil in the target area, and substituting the near infrared spectrum data into the following formula I to calculate the content of hydrolyzable nitrogen in the soil in the target area:

Y＝10.3098x₁-42.4784x₂+51.0755x₃+28.0307x₄+70.2843x₅-45.5027x₆-23.7491x₇-24.4559x₈-24.5916x₉-24.3227x₁₀-23.856x₁₁-22.9758x₁₂-21.539x₁₃-20.2036x₁₄-19.494x₁₅-19.0637x₁₆-31.7123x₁₇-33.8618x₁₈+43.0176x₁₉-34.2903x₂₀-13.4066x₂₁+44.9829x₂₂+48.1193x₂₃+30.6831x₂₄+34.7542x₂₅+44.9715x₂₆+19.3005x₂₇-16.3375x₂₈-18.388x₂₉+25.3382x₃₀+22.8391x₃₁+20.861x₃₂-22.6667x₃₃+15.5656x₃₄+16.9775x₃₅+18.1029x₃₆+20.147x₃₇+20.4145x₃₈+24.8051x₃₉+27.0216x₄₀+32.6909x₄₁+33.4229x₄₂+32.475x₄₃+28.697x₄₄-16.3851x₄₅-42.8647x₄₆-32.062x₄₇-25.6364x₄₈-48.7665x₄₉-44.6191x₅₀+49.7776x₅₁-54.7819x₅₂-47.6881x₅₃+28.2085x₅₄+36.8441x₅₅+33.3235x₅₆+34.5734x₅₇+34.1352x₅₈+34.21x₅₉

wherein Y is a dimensionless number of hydrolyzable nitrogen of the soil of the target area, x₁、x₂……x₃₉The number of points of the characteristic wave band in the near infrared spectrum data.

In some embodiments, the number of points in the near infrared spectral data in the characteristic band refers to:

x₁represents 4118.215cm^-1The number of points of a wave band; x is the number of₂Represents 4156.382cm^-1The number of points of a wave band; x is the number of₃Represents 4240.349cm^-1The number of points of a wave band; x is the number of₄Represents 4526.602cm^-1The number of points of a wave band; x is the number of₅Represents 4599.119cm^-1The number of points of a wave band; x is the number of₆Represents 4637.286cm^-1The number of points of a wave band; x is the number of₇Represents 4866.288cm^-1The number of points of a wave band; x is the number of₈Represents 4870.104cm^-1The number of points of a wave band; x is the number of₉Represents 4873.921cm^-1The number of points of a wave band; x is the number of₁₀Represents 4877.738cm^-1The number of points of a wave band; x is the number of₁₁Represents 4881.554cm^-1The number of points of a wave band; x is the number of₁₂Represents 4885.371cm^-1The number of points of a wave band; x is the number of₁₃Represents 4889.188cm^-1The number of points of a wave band; x is the number of₁₄Represents 4893.004cm^-1The number of points of a wave band; x is the number of₁₅Represents 4896.821cm^-1The number of points of a wave band; x is the number of₁₆Represents 4900.638cm^-1The number of points of a wave band; x is the number of₁₇Represents 5205.974cm^-1The number of points of a wave band; x is the number of₁₈Represents 5209.79cm^-1The number of points of a wave band; x is the number of₁₉Represents 5232.69cm^-1The number of points of a wave band; x is the number of₂₀Represents 5263.224cm^-1The number of points of a wave band; x is the number of₂₁Represents 5305.208cm^-1The number of points of a wave band; x is the number of₂₂Represents 5381.542cm^-1The number of points of a wave band; x is the number of₂₃Represents 5385.358cm^-1The number of points of a wave band; x is the number of₂₄Represents 5389.175cm^-1The number of points of a wave band; x is the number of₂₅Represents 5419.708cm^-1The number of points of a wave band; x is the number of₂₆Represents 5469.326cm^-1The number of points of a wave band; x is the number of₂₇Represents 5476.959cm^-1The number of points of a wave band; x is the number of₂₈Represents 5702.144cm^-1The number of points of a wave band; x is the number of₂₉Represents 5705.96cm^-1The number of points of a wave band; x is the number of₃₀Represents 5763.211cm^-1The number of points of a wave band; x is the number of₃₁Represents 5774.661cm^-1The number of points of a wave band; x is the number of₃₂Represents 5778.478cm^-1The number of points of a wave band; x is the number of₃₃Represents 5843.362cm^-1The number of points of a wave band; x is the number of₃₄Represents 5904.429cm^-1The number of points of a wave band; x is the number of₃₅Represents 5908.246cm^-1The number of points of a wave band; x is the number of₃₆Represents 5912.062cm^-1The number of points of a wave band; x is the number of₃₇Represents 5915.879cm^-1The number of points of a wave band; x is the number of₃₈Represents 5923.512cm^-1The number of points of a wave band; x is the number of₃₉Represents 5942.596cm^-1The number of points of a wave band; x is the number of₄₀Represents 5946.413cm^-1The number of points of a wave band; x is the number of₄₁Represents 5965.496cm^-1The number of points of a wave band; x is the number of₄₂Represents 5969.313cm^-1The number of points of a wave band; x is the number of₄₃Represents 5973.129cm^-1The number of points of a wave band; x is the number of₄₄Represents 6984.554cm^-1The number of points of a wave band; x is the number of₄₅Represents 7041.804cm^-1The number of points of a wave band; x is the number of₄₆Represents 7045.621cm^-1The number of points of a wave band; x is the number of₄₇Represents 7072.338cm^-1The number of points of a wave band; x is the number of₄₈Represents 7076.155cm^-1The number of points of a wave band; x is the number of₄₉Represents 7160.122cm^-1The number of points of a wave band; x is the number of₅₀Represents 7163.938cm^-1The number of points of a wave band; x is the number of₅₁Represents 7194.472cm^-1The number of points of a wave band; x is the number of₅₂Represents 7282.256cm^-1The number of points of a wave band; x is the number of₅₃Represents 7331.873cm^-1The number of points of a wave band; x is the number of₅₄Represents 8579.933cm^-1The number of points of a wave band; x is the number of₅₅Represents 8614.283cm^-1The number of points of a wave band; x is the number of₅₆Represents 8633.366cm^-1The number of points of a wave band; x is the number of₅₇Represents 8656.267cm^-1The number of points of a wave band; x is the number of₅₈Represents 8660.083cm^-1The number of points of a wave band; x is the number of₅₉Represents 8663.9cm^-1The number of points of the band.

In other embodiments, the near infrared spectral data is a value determined by a near infrared spectrometer for soil in the target area.

In a particular embodiment, the soil hydrolyzable nitrogen is measured in mg/kg.

In all embodiments of the invention, the soil is in particular tobacco-planting soil.

Group 3 example, prediction system of soil hydrolyzable nitrogen of the present invention

The group of embodiments provides a soil hydrolyzable nitrogen prediction system based on near infrared spectroscopy. All embodiments of this group share the following common features: the system for predicting soil hydrolyzable nitrogen based on near infrared spectrum comprises a computer readable storage medium; wherein the computer-readable storage medium stores a computer program; the computer program, when executed by a processor, performs a method for calculating soil hydrolyzable nitrogen based on near infrared spectroscopy as provided in any one of embodiment 1.

Experimental example and accuracy verification of soil hydrolyzable nitrogen prediction method

Taking tobacco planting soil in different areas of different places as samples, and numbering; dividing the soil samples of each area into 6 groups, wherein 3 groups adopt a near-infrared spectrometer to measure the near-infrared spectrum data of the soil samples, acquiring the point value of a characteristic waveband, substituting the prediction method of the invention into a formula I to calculate the content of the hydrolyzable nitrogen in the soil, taking 3 groups as 3 repetitions, and averaging to obtain a predicted value of the content of the hydrolyzable nitrogen (as listed in a column of 'predicted value of hydrolyzable nitrogen content' in the following table 3);

in the other 3 groups, the soil hydrolyzable nitrogen content measurement is carried out by a method (a standard method, for example, the method described in the standard document "Kjeldahl determination of hydrolyzable nitrogen in soil" DB 64/T1734-;

specific values are shown in table 3 below:

TABLE 3

The two columns of data in table 3 above were input into SPSS statistical software for significance analysis, and the results are shown in table 4 below:

TABLE 4

As can be seen from table 3 above, the predicted value of the content of hydrolyzable nitrogen in the soil sample predicted by the prediction method of the present invention and the reference value actually measured by the conventional method (alkaline hydrolysis method) have an average value of relative deviation between two sets of data of 16.93%, and according to the general experience in the art, the result that the average value of relative deviation is below 20% is credible.

Moreover, the difference analysis results in table 4 show that the P value is greater than 0.05, which indicates that the difference between the two sets of data is not significant, and further shows that the difference between the soil hydrolyzable nitrogen content value obtained by prediction calculation by the soil hydrolyzable nitrogen prediction method of the present invention is not significant compared with the reference value actually measured by the standard method, and the prediction method of the present invention has accuracy.