阅读说明：本技术 一种营养型土壤保水组合物、其制备方法及应用 (Nutritional soil water-retaining composition, and preparation method and application thereof ) 是由 常大勇 张在花 孙明明 王琳 丁玮琳 贾朝佩 李恩广 廖俊彦 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种营养型土壤保水组合物,其以重量份数计,包括如下组分：蚝壳-保水剂混合物30～70份,羟丙基甲基纤维素1～10份和脱水木糖醇渣10～20份；所述的蚝壳-保水剂混合物的组分包括蚝壳粉和保水剂,所述的保水剂的用量为以蚝壳粉质量计1wt％～20wt％。本发明还公开了上述营养型土壤保水组合物的制备方法及其在土壤改良中的应用。本发明提供的的营养型保水剂,不仅能够提供土壤所需的钙、镁、锶等元素,而且蚝壳特定粒径的微孔结构与三维网格结构的保水剂发生协同作用,使制备的营养型保水剂在保水保肥方面发挥更强劲功效,改善土壤环境,提高作物产量。(The invention discloses a nutritional soil water-retaining composition which comprises the following components in parts by weight: 30-70 parts of oyster shell-water-retaining agent mixture, 1-10 parts of hydroxypropyl methyl cellulose and 10-20 parts of dehydrated xylitol residue; the components of the oyster shell-water-retaining agent mixture comprise oyster shell powder and a water-retaining agent, wherein the amount of the water-retaining agent is 1 wt% -20 wt% of the mass of the oyster shell powder. The invention also discloses a preparation method of the nutritional soil water-retaining composition and application of the nutritional soil water-retaining composition in soil improvement. The nutritional water-retaining agent provided by the invention can provide elements such as calcium, magnesium, strontium and the like required by soil, and the microporous structure with specific particle size of oyster shells and the water-retaining agent with a three-dimensional grid structure have a synergistic effect, so that the prepared nutritional water-retaining agent has stronger effects on water and fertilizer retention, the soil environment is improved, and the crop yield is increased.)

1. The nutritional soil water retention composition is characterized by comprising the following components in parts by weight: 30-70 parts of oyster shell-water-retaining agent mixture, 1-10 parts of hydroxypropyl methyl cellulose and 10-20 parts of dehydrated xylitol residue;

the components of the oyster shell-water-retaining agent mixture comprise oyster shell powder and a water-retaining agent, wherein the amount of the water-retaining agent is 1 wt% -20 wt% of the mass of the oyster shell powder.

2. The nutritional soil water retention composition according to claim 1, wherein the particle size of the oyster shell powder is 30-100 mesh.

3. The nutritional soil water-retaining composition according to claim 1 or 2, wherein the water-retaining agent is sodium polyacrylate.

4. The nutritional soil water-retention composition according to claim 1 or 2, wherein the oyster shell powder is obtained by acid leaching and crushing oyster shells.

5. A method of preparing a nutritional soil water-retaining composition according to any one of claims 1 to 4, comprising the steps of:

(1) immersing oyster shells into 5-10 wt% hydrochloric acid solution for 36-60 h, cleaning with water, drying, crushing, sieving, and collecting oyster shell powder with the particle size of 30-100 meshes;

(2) uniformly mixing the oyster shell powder obtained in the step (1), a water-retaining agent and water to form a suspension;

(3) treating the suspension obtained in the step (2) at the temperature of 100-150 ℃ and under the pressure of 1.5-1.8 MPa for 5-10 h, drying, crushing, and sieving to obtain an oyster shell-water-retaining agent mixture;

(4) and uniformly mixing the oyster shell-water retention agent mixture, hydroxypropyl methyl cellulose and dehydrated xylitol residues.

6. The preparation method according to claim 5, wherein in the step (3), the sieving is performed by a 60-80 mesh sieve.

7. The production method according to claim 5, wherein in the step (3):

the high-pressure treatment temperature is 120-150 ℃;

the high-pressure treatment time is 6-10 h;

the drying temperature is 60-70 ℃;

the crushing is carried out at a speed of 5000-7000 r/min for 3-6 min.

8. The preparation method according to claim 5, wherein in the step (1), the oyster shell is washed and soaked in water for 36-60 hours before being soaked in the hydrochloric acid solution.

9. Use of a nutritional soil water retention composition as claimed in any one of claims 1 to 4 in soil improvement.

10. Use according to claim 9, for soil improvement in soybean, strawberry, tomato, apple planting.

Technical Field

The invention belongs to the field of soil conditioners, and particularly relates to a nutritional soil water-retaining composition, and a preparation method and application thereof.

Background

China is a country with serious shortage of water resources, the total area of arid and semi-arid regions is 508 ten thousand square kilometers, and the area accounts for 53 percent of the total area of the national soil, wherein agricultural water occupies a large proportion in the utilization of the water resources in China, and the water resource crisis gradually one of the facing resource environmental problems. Especially, the drought is serious in northwest area of China, the existing mature technology only has the engineering technology of micro-irrigation, drip irrigation and the like with large investment, and the water-retaining agent with low investment and good water-saving performance is rarely popularized and applied.

The water retention agent, namely, super absorbent resin, is a functional polymer material with extremely strong water absorption capacity, can absorb water which is hundreds of times larger than the self weight in a short time, and can also be slowly released when crops lack water, so that the water retention agent becomes an important preparation in the agricultural chemical water-saving technology. However, the single water-retaining agent can only meet the requirement of crop moisture, has the defects of poor salt tolerance, difficult degradation, high price and the like, and is difficult to popularize and apply.

The oyster shell is formed by biomineralization of a small amount of organic macromolecules (protein or saccharides) and a plurality of inorganic salts as units. The oyster shell structure can be divided into three layers, wherein the outer layer is a hardened protein cuticle with extremely thin thickness, the middle layer is a leaf-shaped prismatic layer existing in natural pores, and the inner layer is a pearl layer and mainly comprises mineral substances and a small amount of organic matters.

The patent of the invention for applying oyster shell to soil conditioning refers to the following: the invention relates to an acid soil conditioner for improving saline-alkali soil (patent application number: 201910686403.9); the invention relates to a soil conditioner for planting sand pear trees (patent application number: 201710910352.4); the invention patent "a soil water-retaining agent" (patent application No. 201610662108.6); the invention discloses a soil conditioner for planting sand pear trees (patent application number: 201710910352.4). The water-retaining agent, the polyacrylamide, the oyster shell and the like are added to the soil water-retaining agent, the conditioning/modifying agent, the loose density of the soil is facilitated, the degradation phenomenon of the chemical fertilizer to the soil is avoided, the water and fertilizer are retained, and the water-permeable and air-permeable effects are good. Reduce the salt alkalinity of the soil and improve the crop yield.

The invention discloses an oyster shell powder modified water treatment agent and a preparation method and application thereof (patent application number: 201910286286.7), wherein the oyster shell powder modified water treatment agent is prepared from oyster shell powder, polyacrylamide, sodium carboxymethylcellulose and the like, and is used for treating Ni²⁺、Co²⁺、Cu²⁺The heavy metal ions have a faster and more efficient adsorption effect, and have excellent stability and durability, so that the treatment of wastes with processes of wastes against one another is effectively realized.

The patent of the invention for applying oyster shells to fertilizers refers to the following: the invention relates to a preparation of a multifunctional humic acid fertilizer with water and fertilizer retention functions (patent application number: 201210573643.6); the invention discloses a preparation method of an animal and plant type organic fertilizer (patent application number: 201611117603.5); the invention patent "a fertilizer" (patent application No. 201510339557.2); the invention discloses a manufacturing method of a synergistic nitrogen fertilizer with slow-release and loss-control effects (patent application number: 201210573663.3); the invention patent of 'an agricultural ecological fertilizer' (patent application number: 201610662108.6); the invention discloses a secondary saline-alkali soil conditioning and improving secondary saline-alkali soil secondary element fertilizer and a production method thereof (patent application number: 201610754970. X). The water-retaining agent, the polyacrylamide, the oyster shell and the like are added to the fertilizer to form different fertilizers, and all the components are combined with each other, so that the nutrient utilization efficiency is improved, and the effects of improving quality and increasing yield are achieved.

However, no report is found that the nutritional water-retaining agent is prepared by utilizing the synergistic effect of the microporous structure with specific particle size of oyster shells and the water-retaining agent with a three-dimensional grid structure.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a nutritional soil water retention composition, a preparation method and application thereof, and the water retention performance of soil is improved by utilizing the synergistic effect of the three-dimensional microporous structure of oyster shells and a water retention agent.

The specific technical scheme is as follows:

one of the purposes of the invention is to provide a nutritional soil water retention composition which comprises the following components in parts by weight: 30-70 parts of oyster shell-water-retaining agent mixture, 1-10 parts of hydroxypropyl methyl cellulose and 10-20 parts of dehydrated xylitol residue;

the oyster shell-water retaining agent mixture comprises the components of oyster shell powder and a water retaining agent, wherein the amount of the water retaining agent is 1 wt% -20 wt% of the mass of the oyster shell powder, and the preferable amount is 8 wt% -20 wt%.

Wherein, the water content in the dehydrated xylitol residues is lower than 5 wt%. The xylitol residue is residue which is generated when rice core is used as a raw material and xylose is prepared by olefine acid hydrolysis and is rich in lignin and cellulose.

Specifically, the particle size of the oyster shell powder is 30-100 meshes.

Specifically, the water-retaining agent is sodium polyacrylate.

Because the structure of the oyster shell is specific, the oyster shell contains a large number of micropores and has strong adsorption capacity, and more importantly, the oyster shell micropore structure with a specific particle size (30-100 meshes) and the water-retaining agent with a three-dimensional grid structure have a synergistic effect under specific conditions, so that the growth of crops is promoted, the soil structure is improved, and the water absorption and water retention performance of the soil is enhanced. Specifically, because the oyster shell has a microporous structure, when the particle size is proper, the oyster shell can provide a framework supporting effect for the water-retaining agent, improve the dispersibility and prevent soil hardening; meanwhile, the water-retaining agent is protected by the micropores, so that on one hand, the contact between microorganisms and the water-retaining agent can be prevented, the decomposition speed of the water-retaining agent is greatly slowed down, the effective period of the water-retaining agent is further prolonged, and the effect of long-term water retention by one-time application is achieved; on the other hand, the micropores can prevent the water-retaining agent from instantly absorbing a large amount of water, play a role in slow release and prevent the soil from waterlogging and damaging the root system. In addition, the composition of the invention can reduce the equilibrium humidity of the water-retaining agent and prevent the water-retaining agent from absorbing water from the soil reversely under the low humidity condition. Therefore, the soil water-retaining composition of the invention can play a unique advantage in the aspects of drought, desertification control and water and soil conservation. It should be noted that the particle size and the dosage of the oyster shell whiting of the present invention are necessary, and the improper particle size or dosage can make the effect of the present invention not be realized.

Further, the oyster shell powder is obtained by crushing oyster shells after acid leaching treatment. On one hand, heavy metals such as mercury and chromium in the oyster shell can be removed through acid leaching, on the other hand, micropores of the oyster shell are completely blocked by sludge after the oyster shell is placed in marine sludge for a long time, and the micropore structure of the oyster shell is cleaned through acid leaching, and meanwhile, a smooth glaze layer on the inner surface of the micropore is damaged, so that the oyster shell is easier to attach.

The invention also aims to provide a preparation method of the nutritional soil water-retaining composition, which comprises the following steps:

(1) immersing oyster shells into 5-10 wt% hydrochloric acid solution for 36-60 h, cleaning with water, drying, crushing, sieving, and collecting oyster shell powder with the particle size of 30-100 meshes;

(2) uniformly mixing the oyster shell powder obtained in the step (1), a water-retaining agent and water to form a suspension;

(3) mixing the suspension obtained in the step (3) at the temperature of 100-150 ℃ and under the pressure of 1.5-1.8 MPa for 5-10 h, drying, crushing, and sieving to obtain an oyster shell-water-retaining agent mixture;

(4) and uniformly mixing the oyster shell-water retention agent mixture, hydroxypropyl methyl cellulose and dehydrated xylitol residues.

Further, in the step (1), before soaking the oyster shells in the hydrochloric acid solution, cleaning and soaking the oyster shells in water for 36-60 hours to remove silt and salt. Specifically, the water may be changed 2-3 times during soaking with water to remove surface salt.

Furthermore, the crushing in the step (1) can be carried out coarse crushing and then ultramicro crushing,

further, in the step (2), the amount of water is 50-80 wt% based on the oyster shell powder.

Further, in the step (3), the sieving is performed by sieving with a 60-80 mesh sieve.

Further, in the step (3), the high-pressure treatment temperature is 120-150 ℃.

Further, in the step (3), the high-pressure treatment time is 6-10 h.

Further, in the step (3), the drying temperature is 60-70 ℃, and the drying is carried out until the moisture content is lower than 3 wt%.

Further, in the step (3), the crushing is carried out at a speed of 5000-7000 r/min for 3-6 min.

The invention also aims to provide the application of the nutritional soil water-retaining composition in soil improvement.

The soil water-retaining composition can play a unique advantage in the aspects of drought, desertification control and water and soil conservation, and can effectively promote the yield increase of crops.

Furthermore, the nutritional soil water-retaining composition is applied to soil improvement in the planting of soybeans, strawberries, tomatoes and apples.

Furthermore, when the nutritional soil water-retaining composition is used, the nutritional soil water-retaining composition is uniformly mixed with base fertilizer and then is spread and ploughed, and the using amount of the soil water-retaining composition is 10-50 kg per mu.

The invention has the following beneficial effects:

the common water-retaining agent can absorb water by 500 times of the self weight and can not be lower than 100 times at least according to relevant standards of agricultural departments, and the common water-retaining agent can face the following three fatal problems when in use:

1. in dry weather, the water is extremely deficient, the water absorption capacity of the water-retaining agent is far higher than that of the crop root system, and the water-retaining agent can compete for the water with the root system.

2. When flood disasters occur, water needs to be drained when underground is waterlogged, and the root system is rotten because the strong water absorption of the water-retaining agent is not beneficial to draining.

3. The water-retaining agent is quickly decomposed by microorganisms in soil, and the service life is short.

The nutritional water-retaining agent provided by the invention can provide elements such as calcium, magnesium, strontium and the like required by soil, and the microporous structure with specific particle size of oyster shells and the water-retaining agent with a three-dimensional grid structure have a synergistic effect, so that the prepared nutritional water-retaining agent has stronger effects on water and fertilizer retention, the soil environment is improved, and the crop yield is increased.

Due to the multi-layer microporous structure of the oyster shell, the water-absorbing capacity of the water-retaining agent is moderate, and the water-retaining agent cannot compete with root systems for water; the oyster shell does not prevent the excretion of water; the protective effect of the oyster shell on organic substances can prolong the service life of the product. The composition is safe and environment-friendly, does not damage other beneficial components in soil, and has the advantages of simple preparation method, easy large-scale production, less equipment investment and low production cost.

Detailed Description

The principles and features of this invention are described below in conjunction with examples, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

Example 1

A nutritional soil water-retaining composition is prepared by the following steps:

(1) cleaning the surface of the oyster shell, and soaking in tap water for 48h, wherein the water is changed for 2 times; then immersing in 10 wt% hydrochloric acid solution for 48 h; and cleaning the oyster shells subjected to acid treatment with water, drying, then carrying out coarse crushing, carrying out ultrafine crushing by using a universal crusher, sieving by using 30-mesh and 100-mesh sieves, and collecting the oyster shells with the particle size of 30-100 meshes for later use.

(2) Uniformly mixing the oyster shell powder obtained in the step (1), sodium polyacrylate and water to form a suspension; the addition amount of the sodium polyacrylate is 10 wt% of the oyster shell powder, and the addition amount of the water is 70 wt% of the oyster shell powder.

(3) And (3) putting the suspension obtained in the step (2) into an autoclave, mixing and heating for 8h at 130 ℃ and 1.5MPa, cooling, drying at 70 ℃ until the water content is lower than 3 wt%, crushing at 6000r/min for 5min, sieving with a 80-mesh sieve, and taking undersize products to obtain the oyster shell-water-retaining agent mixture.

(4) Dehydrating the xylitol residue until the water content is lower than 5 wt%, and uniformly mixing 300kg of oyster shell-water retention agent mixture, 30kg of hydroxypropyl methylcellulose and 45kg of dehydrated xylitol residue in a high-speed mixer to obtain the soil water retention composition.

Example 2

A nutritional soil water-retaining composition is prepared by the following steps:

(1) cleaning the surface of the oyster shell, and soaking in tap water for 48h, wherein the water is changed for 2 times; then immersing in 10 wt% hydrochloric acid solution for 48 h; and cleaning the oyster shells subjected to acid treatment with water, drying, then carrying out coarse crushing, carrying out ultrafine crushing by using a universal crusher, sieving by using 30-mesh and 100-mesh sieves, and collecting the oyster shells with the particle size of 30-100 meshes for later use.

(2) Uniformly mixing the oyster shell powder obtained in the step (1), sodium polyacrylate and water to form a suspension; the addition amount of the sodium polyacrylate is 15 wt% of the oyster shell powder, and the addition amount of the water is 70 wt% of the oyster shell powder.

(3) And (3) putting the suspension obtained in the step (2) into an autoclave, mixing and heating for 6h at 150 ℃ and 1.8MPa, cooling, drying at 70 ℃ until the water content is lower than 3 wt%, crushing at 6000r/min for 5min, sieving with a 80-mesh sieve, and taking undersize products to obtain the oyster shell-water-retaining agent mixture.

(4) Dehydrating xylitol residue until the water content is lower than 5 wt%, and uniformly mixing 240kg of oyster shell-water retention agent mixture, 19.2kg of hydroxypropyl methylcellulose and 45kg of dehydrated xylitol residue in a high-speed mixer to obtain the soil water retention composition.

Example 3

1. A nutritional soil water-retaining composition is prepared by the following steps:

(1) cleaning the surface of the oyster shell, soaking the oyster shell in tap water for 48h, changing water for 2 times, and then immersing the oyster shell in 10 wt% hydrochloric acid solution for 48 h; and cleaning the oyster shells subjected to acid treatment with water, drying, then carrying out coarse crushing, carrying out ultrafine crushing by using a universal crusher, sieving by using 30-mesh and 100-mesh sieves, and collecting the oyster shells with the particle size of 30-100 meshes for later use.

(2) Uniformly mixing the oyster shell powder obtained in the step (1), sodium polyacrylate and water to form a suspension; the addition amount of the sodium polyacrylate is 20 wt% of the oyster shell powder, and the addition amount of the water is 70 wt% of the oyster shell powder.

(3) And (3) putting the suspension obtained in the step (2) into an autoclave, mixing and heating for 7h at 140 ℃ and 1.6MPa, cooling, drying at 70 ℃ until the water content is lower than 3 wt%, crushing at 6000r/min for 5min, sieving with a 80-mesh sieve, and taking undersize products to obtain the oyster shell-water-retaining agent mixture.

(4) Dehydrating the xylitol residue until the water content is lower than 5 wt%, and uniformly mixing 360kg of oyster shell-water retention agent mixture, 25kg of hydroxypropyl methyl cellulose and 54kg of dehydrated xylitol residue in a high-speed mixer to obtain the soil water retention composition.

Comparative example 1

A composition was prepared, with reference to example 1, differing from example 1 in that: and (3) replacing 300kg of the oyster shell-water-retaining agent composition in the components by 272.7kg of the oyster shell powder with the particle size of 30-100 meshes obtained in the step (1) without preparing the oyster shell-water-retaining agent composition.

Comparative example 2

A composition was prepared, with reference to example 1, differing from example 1 in that: no oyster shell-water-retaining agent composition is prepared, and 300kg of oyster shell-water-retaining agent composition in the components is replaced by 27.3kg of sodium polyacrylate.

Comparative example 3

A composition was prepared, with reference to example 1, differing from example 1 in that: in the step (1), collecting an oyster shell powder part with the particle size of less than 30 meshes for later use;

the remaining technical features are the same as those of example 1.

Comparative example 4

A composition was prepared, with reference to example 1, differing from example 1 in that: in the step (1), collecting an oyster shell powder part with the particle size of more than 100 meshes for later use;

the remaining technical features are the same as those of example 1.

Comparative example 5

A composition was prepared, with reference to example 1, differing from example 1 in that: and (3) directly mixing oyster shells, a water-retaining agent, hydroxypropyl methyl cellulose and dehydrated xylitol residues without steps (2) and (3).

The remaining technical features are the same as those of example 1.

Experiment 1

The soil water-retaining composition obtained in example 1 was tested for short-term soil water-retaining performance at various dosages.

Setting 5 experimental groups and 1 control group, wherein 50g of soil in each group is put into an evaporating dish, and adding different amounts of soil water-retaining compositions, and in the experimental groups 1-5, the adding amounts of the soil water-retaining compositions are 1 wt%, 2.5 wt%, 5 wt%, 7.5 wt% and 10 wt% in sequence (the control group is not treated). In the initial stage, the water content of the soil (the water content of the soil is the percentage of the dry soil weight) is uniformly controlled to be 60 wt%, and the room temperature and the environmental humidity are 40-60%. The change in soil moisture content was recorded and the results are shown in Table 1. Each experimental group was performed simultaneously in the same room.

TABLE 1

Experiment 2

The soil water-retaining compositions obtained in examples 1 to 3 and comparative examples 1 to 5 were compared in terms of short-term soil water-retaining performance.

Taking 50g of soil in each group, putting the soil in an evaporation pan, and respectively adding different soil water-retaining compositions accounting for 7.5 wt% of the soil mass; meanwhile, a control group is set, and soil with the same quality is added. At the initial stage, the water content of the soil is uniformly controlled to be 60 wt%, and the room temperature and the environmental humidity are controlled to be 40% -60%. Each experimental group was performed simultaneously in the same room. The change in soil moisture content was recorded and the results are shown in Table 2.

TABLE 2

As can be seen from table 2, the short-term water retention effect of the present invention is significantly superior to that of each comparative example.

Experiment 3

The soil water-retaining composition obtained in example 1 was tested for soil water-retaining properties under different soil humidity conditions. A, B, C, D four groups of soil with different humidity are arranged, wherein the mass of each group of soil is 50g, and the soil is put into an evaporation pan; the group A soil moisture content is 10%, the group B soil moisture content is 30%, and the group C soil moisture content is 60%; the water content of the soil in the group D is 80%, and 7.5 wt% of the soil water-retaining agent composition obtained in example 1 is added to the soil under the same conditions. Meanwhile, four groups of control groups which have the same soil quality and the same initial soil humidity and are not added with the soil water-retaining agent composition are correspondingly arranged. Room temperature and environment humidity of 40-60%, and all experimental groups are carried out simultaneously in the same room. The change in the water content of the soil was recorded and the results are shown in Table 3.

TABLE 3

Experiment 4

The soil water-retaining compositions obtained in comparative example 1 and comparative examples 1 to 4 have long-term soil water-retaining properties.

Each group of soil is 50g in mass and is put into an evaporation pan; each group is respectively added with 10 wt% of different soil water-retaining compositions based on the mass of the soil; simultaneously setting a control group 1, and adding soil with the same quality; a control group 2 to which 7.5 wt% of the soil water-retaining composition of example 1 was added based on the mass of the soil was also set. At the initial stage, the water content of the soil is uniformly controlled to be 60 wt%, and the room temperature and the environmental humidity are controlled to be 40% -60%. Each experimental group was performed simultaneously in the same room. The change in soil moisture content was recorded and the results are shown in Table 4.

TABLE 4

As can be seen from Table 4, the long-term water retention effect of the present invention is significantly superior to that of each comparative example.

Experiment 5

The soil water-retaining compositions obtained in comparative example 1 and comparative example 2 were compared in their instantaneous water absorption capacity.

Taking 50g of soil in each group, putting the soil into an evaporating dish with a hole at the bottom, and respectively adding different soil water-retaining compositions accounting for 7.5 wt% of the soil mass; meanwhile, a control group is set, and soil with the same quality is added. Initially, the same excess of water was added, room temperature, ambient humidity 40% to 60%, and the dripping water droplets were received with a graduated cylinder of the same specification, and the graduated cylinder values were recorded, the results are shown in table 5.

TABLE 5

As can be seen from Table 5, the soil water-retaining agent of the present invention can avoid the problems caused by instantaneous absorption of a large amount of water.

Example 4

The soil water-retaining composition obtained in example 1 of the present invention was applied to the planting of crop soybeans.

Treatment 1: 12kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the composition was mixed with a chemical fertilizer and applied uniformly during sowing. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

And (3) treatment 2: 24kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the composition was mixed with a chemical fertilizer and applied uniformly during sowing. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

Comparison: applying the fertilizer for one mu conventionally, and applying 20kg of the special fertilizer for the soybeans.

The results of the application are shown in Table 6.

TABLE 6

Example 5

The soil water-retaining composition obtained in example 1 of the present invention was applied to the planting of strawberry, a crop.

Treatment 1: 10kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the composition was uniformly applied while being mixed with a chemical fertilizer during soil turning. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

And (3) treatment 2: 20kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the composition was uniformly applied while being mixed with a chemical fertilizer during soil turning. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

Comparison: applying the fertilizer for one mu conventionally, and applying 20kg of the special fertilizer for the strawberries.

The results of the application are shown in Table 7.

TABLE 7

Example 6

The soil water-retaining composition obtained in example 1 of the present invention was applied to the planting of tomato crop.

Treatment 1: 10kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the composition was uniformly applied when mixed with a chemical fertilizer for seed loading. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

And (3) treatment 2: 20kg of the soil water-retaining composition obtained in example 1 was applied per mu, and the soil water-retaining composition was uniformly applied when mixed with a chemical fertilizer for seed loading. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

Comparison: applying the fertilizer for each mu in a conventional way, and applying 20kg of the special fertilizer for the tomatoes.

The results of the application are shown in Table 8.

TABLE 8

Example 7

The soil water-retaining composition obtained in the embodiment 1 of the invention is applied to the planting of crops such as apples.

Treatment 1: 15kg of the soil water-retaining composition obtained in example 1 was applied per mu, and mixed with a chemical fertilizer and applied uniformly at the time of flowering. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

And (3) treatment 2: 30kg of the soil water-retaining composition obtained in example 1 was applied per mu, and mixed with a chemical fertilizer and applied uniformly at the time of flowering. The amount of the conventional chemical fertilizer used as the base fertilizer is reduced by 1/3.

Comparison: applying the fertilizer for one mu conventionally, and applying 20kg of special fertilizer for apples.

The results of the application are shown in Table 9.

TABLE 9

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.