阅读说明：本技术 除草组合物及其应用 (Herbicidal composition and use thereof ) 是由 左元明 罗小娟 李双阳 黄超 苟骄 于 2019-09-10 设计创作，主要内容包括：本发明公开了一种除草组合物及其应用。所述除草组合物包括活性成分A和活性成分B。其中,所述活性成分A为精草铵膦,所述活性成分B包括精喹禾灵。所述活性成分A和活性成分B的重量比为2:1～30:1。所述除草组合物可用于防治多年生禾本杂草、阔叶杂草和莎草杂草。通过多种活性成分的复配,提高大龄杂草的防除效率,提高低温防效,减少除草活性成分的用量,提高药剂的速效性,减少用药剂量。(The invention discloses a weeding composition and application thereof. The weeding composition comprises an active ingredient A and an active ingredient B. Wherein the active ingredient A is glufosinate-ammonium and the active ingredient B comprises quizalofop-p-ethyl. The weight ratio of the active ingredient A to the active ingredient B is 2: 1-30: 1. The herbicidal composition can be used for controlling perennial grassy weeds, broadleaf weeds and sedge weeds. By compounding various active ingredients, the control efficiency of the old weeds is improved, the low-temperature control effect is improved, the dosage of the weeding active ingredients is reduced, the quick-acting performance of the herbicide is improved, and the dosage of the herbicide is reduced.)

1. The weeding composition is characterized by comprising an active ingredient A and an active ingredient B, wherein the active ingredient A is glufosinate-ammonium, the active ingredient B comprises quizalofop-p-ethyl, and the weight ratio of the active ingredient A to the active ingredient B is 2: 1-30: 1.

2. A herbicidal composition according to claim 1, wherein the weight percentage of active ingredient a and active ingredient B is from 0.5 to 40% based on the total weight of the herbicidal composition.

3. A herbicidal composition according to claim 1 or 2, wherein the effective amount of the herbicidal composition is 1 to 100g (a.i.)/ha.

4. A herbicidal composition according to claim 1 or 2, wherein the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl and 1-30% of composite auxiliary agent.

5. The herbicidal composition of claim 4, wherein the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 0.5-10% of alkyl glycoside, 1-15% of alcohol ether carboxylate and the balance of water.

6. The herbicidal composition of claim 4, wherein the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 1-15% of alkylbenzene sulfonate, 1-10% of alkylphenol polyoxyethylene ether and 10-55% of water.

7. A herbicidal composition according to claim 1 or 2, wherein the herbicidal composition further comprises one or more adjuvants selected from the group consisting of fillers, emulsifiers, thickeners, antifreeze agents, dispersants, binders, stabilizers, safeners and synergists.

8. A herbicidal composition according to claim 1 or 2, wherein the herbicidal composition is in a dosage form selected from the group consisting of dusts, granules, microemulsions, oil suspensions.

9. Use of the herbicidal composition according to any one of claims 1 to 8 for controlling weeds.

Technical Field

The invention relates to a weeding composition, in particular to a weeding composition containing glufosinate-ammonium and application thereof in agriculture.

Background

The chemical name of the refined glufosinate-ammonium is 4- [ hydroxy (methyl) phosphonyl]L-homoalanine, readily soluble in water, poorly soluble in organic solvents, stable to light, melting point 214-216 ℃ and the formula: c₅H₁₂NO₄P; molecular weight: 181.1, respectively; the structural formula is as follows:

the glufosinate-ammonium belongs to a non-conductive contact herbicide, and is used for preventing and controlling weeds by inhibiting glutamine synthetase, so that the metabolic disturbance of nitrogen in a plant body and the cumulative poisoning of nitrogen are caused, the synthesis and photosynthesis of chloroplast are hindered, and finally the plant is dead. The refined glufosinate-ammonium has the advantages of low toxicity, high safety, wide weeding spectrum, high activity, high weeding speed and the like. In addition, the refined glufosinate-ammonium has good water solubility and is convenient to process and mix for use.

Quizalofop-p-ethyl (R) -2- [4- (6-chloroquinoxaline-2-yloxy) phenoxy ] ethyl propionate) is a phenoxy fatty acid selective systemic conduction type herbicide, and the chemical structural formula is as follows:

the quizalofop-p-ethyl has good selectivity and control effect on gramineous weeds in broad-leaved crop fields, and can prevent and kill off annual gramineous weeds such as wild oats, barnyard grass, green bristlegrass, large crabgrass and the like. But quizalofop-p-ethyl has poor control effect at low temperature, and the dosage of gramineous weeds with large grass age needs to be increased to realize ideal control effect.

In addition, the long-term use of the glufosinate-ammonium or quizalofop-p-ethyl single agent can easily cause drug resistance, so that the dosage is increased, the environmental impact is increased, the prevention and treatment effect is reduced, and the medication cost is increased.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a herbicidal composition, which comprises glufosinate-ammonium as one of the active ingredients and is compounded with quizalofop-p-ethyl, so as to improve the control efficiency of the old weeds, improve the low-temperature control effect, reduce the dosage of the herbicidal active ingredients, improve the quick action of the herbicide, and reduce the dosage of the herbicide.

According to one aspect, the invention provides a weeding composition, which comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is glufosinate-ammonium, the active ingredient B comprises quizalofop-p-ethyl, and the weight ratio of the active ingredient A to the active ingredient B is 2: 1-30: 1.

The weight percentage of the active ingredient A and the active ingredient B is 0.5-40% based on the total weight of the weeding composition.

According to a specific embodiment, the effective amount of the herbicidal composition is 1 to 100g (a.i.)/ha.

According to another embodiment, the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl and 1-30% of composite auxiliary agent.

According to a specific embodiment, the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 0.5-10% of alkyl glycoside, 1-15% of alcohol ether carboxylate and the balance of water.

According to another embodiment, the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 1-15% of alkylbenzene sulfonate, 1-10% of alkylphenol polyoxyethylene ether and 10-55% of water.

The weeding composition also comprises one or more auxiliary agents of fillers, emulsifiers, thickeners, antifreezing agents, dispersing agents, binders, stabilizers, safeners and synergists.

Optionally, the herbicidal composition is in a dosage form selected from the group consisting of a powder, a granule, a microemulsion, an aqueous emulsion, an oil suspension, and an aqueous suspension.

According to another aspect of the present invention, the present invention also provides use of the herbicidal composition for controlling weeds.

The weeding composition contains glufosinate-ammonium, and has the following advantages by being matched with quizalofop-p-ethyl and optionally the compound auxiliary agent: the high efficiency and excellent water solubility of glufosinate-ammonium are fully utilized, the high selectivity and quick-acting property of quizalofop-p-ethyl to grassy weeds are utilized, and the conduction efficiency of the medicament in plants is improved through the bonding effect among the glufosinate-ammonium, the quizalofop-p-ethyl and the composite auxiliary agent, so that the weeding activity of the glufosinate-ammonium and the quizalofop-p-ethyl is exerted more quickly and fully, the using dosage of a pesticide preparation is reduced, and the use of an organic solvent is reduced; further improves the control efficiency of the compound weeding composition on perennial weeds and improves the low-temperature control effect, thereby enlarging the application range of the pesticide.

Therefore, the weeding composition has more remarkable synergistic effect compared with the glufosinate-ammonium and quizalofop-p-ethyl used independently. In particular, the herbicidal composition according to the present invention is particularly suitable for controlling perennial grassy weeds, broadleaf weeds and sedge weeds, such as moleplant seed, bluegrass, alopecurus tape, cogongrass, goosegrass, crabgrass, cyperus rotundus, and the like.

Detailed Description

The weeding composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is glufosinate-ammonium and the active ingredient B comprises quizalofop-p-ethyl.

The weight ratio of the active ingredient A to the active ingredient B can be 80: 1-1: 80, preferably 60: 1-1: 60, more preferably 50: 1-1: 50, most preferably 30: 1-1: 30, and can be, for example, 25:1, 15:1, 10:1, 5:1, 1:5, 1:10, 1:15, 1:20, 1: 25.

Preferably, the weight ratio of active ingredient a to active ingredient B may be 2:1 to 30:1, preferably 5:1 to 25:1, more preferably 7:1 to 15:1, most preferably 8:1 to 10: 1.

According to a specific embodiment, the above herbicidal composition further comprises a complex adjuvant. The herbicidal composition comprising, based on the total weight of the herbicidal composition: 1-25% (preferably 3-15%, more preferably 8%) of glufosinate-ammonium, 0.5-15% (preferably 3-12%, more preferably 5-10%, e.g. 7%) of quizalofop-p-ethyl, and 1-30% (preferably 5-25%, more preferably 10-20%, e.g. 14%) of a composite additive. For example, the composite auxiliary agent may be a combination of alkyl glycoside and alcohol ether carboxylate in a weight ratio of 7:1 to 1:4 (e.g., 3:1 to 1:2, preferably 2:1, 1:1), or a combination of alkyl benzene sulfonate and alkylphenol ethoxylate in a weight ratio of 15:1 to 1:5 (e.g., 10:1 to 1:3, preferably 5:1 to 1: 2).

The alkyl group in the alkyl glycoside and alkylphenol ethoxylate may be, for example, a C6-C12 alkyl group, and is preferably a dodecyl group.

The alcohol ether carboxylate may be, for example, a C12-C18 alcohol ether carboxylate, such as a dodecyl ether carboxylate, preferably sodium dodecyl ether carboxylate.

The alkylbenzene sulfonate is preferably sodium dodecylbenzene sulfonate or calcium dodecylbenzene sulfonate.

Preferably, the above herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 0.5-10% of alkyl glycoside, 1-15% of alcohol ether carboxylate and the balance of water.

Optionally, the herbicidal composition comprises, based on the total weight of the herbicidal composition: 1-25% of glufosinate-ammonium, 0.5-15% of quizalofop-p-ethyl, 1-15% of alkylbenzene sulfonate, 1-10% of alkylphenol polyoxyethylene ether and 10-55% of water.

Preferably, the herbicidal composition of the present invention may further comprise 1 to 5% by weight of an organic solvent, preferably 1.5 to 3.5%, e.g. 2%, 2.5%.

The organic solvent is selected from ethanol, methanol, N-dimethylformamide, dimethyl sulfoxide, cyclohexanone, and toluene.

The weeding composition can also comprise an oily matrix such as methyl oleate and the like, and is used for preparing formulations such as oil emulsion and the like.

Further, the above herbicidal composition may further comprise one or more adjuvants selected from fillers, emulsifiers, thickeners, antifreezes, dispersants, binders, stabilizers, safeners and synergists.

The filler used in the present invention may be selected from kaolin, bentonite, white carbon black, light calcium carbonate.

The percentage of the active ingredient is 0.5 to 40%, preferably 5 to 35%, more preferably 7 to 20%, for example 15%, based on the total weight of the herbicidal composition.

The dosage form of the weeding composition is selected from powder, granules, microemulsion, emulsion in water, oil suspending agent and water suspending agent.

The weeding composition is preferably microemulsion, and can quickly form a drug film by being diluted by water and then sprayed on a target before use. The weeding composition has strong systemic conductivity, prolongs the lasting time, and has high low-temperature pesticide effect, so that the pesticide utilization rate and selectivity are high, the pesticide dosage is reduced, and the environment-friendly effect is more remarkable.

The herbicidal composition is used in an effective amount of 1 to 100g (a.i.)/ha, preferably 10 to 80g (a.i.)/ha, 15 to 70g (a.i.)/ha, for example 55g (a.i.)/ha, 40g (a.i.)/ha, 25g (a.i.)/ha.

The herbicidal compositions according to the present invention may be provided in the form of a finished formulation, i.e. the ingredients of the composition have been mixed, or the ingredients of the composition may be provided in a single dose, mixed directly in a tank or tank prior to use and then diluted to the desired concentration.

In the weeding composition according to the invention, the glufosinate-ammonium molecular structure contains carboxyl, hydroxyl, amino and phosphonyl, and the quizalofop-p-ethyl molecular structure contains ester acyl, ether bond and halogen-Cl, so that the active ingredients and the compound auxiliary agents, such as phenolic hydroxyl in alkylphenol ethoxylate, alkyl glycoside and a plurality of ether bonds in alcohol ether carboxylate can form a three-dimensional net hydrogen bond structure, can be better attached to the surface of a plant and penetrate through a waxy layer of the plant epidermis, and the absorption efficiency of the medicament is improved, thereby providing a prevention rate. Because the glufosinate-ammonium, the quizalofop-p-ethyl, the alkyl glycoside, the alkylphenol polyoxyethylene, the alkylbenzene sulfonate or the alcohol ether carboxylate have excellent water solubility and biodegradability, the weeding effect can be improved, and the drug residue is low.

The weeding composition can be used for preventing and controlling gramineous weeds, broadleaf weeds and sedge weeds by compounding glufosinate-ammonium and quizalofop-p-ethyl, particularly high-selectivity prevention and control of perennial gramineous weeds, still keeps good prevention effect at low temperature, and has obviously better prevention and control effect under the condition of obviously low dosage.

Furthermore, through the combination of glufosinate-ammonium, quizalofop-p-ethyl and the specific compound auxiliary agent, the contact mode of the medicine liquid drop and the surface of the plant is improved, and the conduction efficiency is improved. Therefore, the specific combination of glufosinate-ammonium, quizalofop-p-ethyl and the compound auxiliary agent further improves the weeding efficiency of the weeding composition.

Specific examples will be listed below to representatively illustrate embodiments of the present invention.

The composition takes glufosinate-ammonium as an active ingredient (A) and quizalofop-p-ethyl as an active ingredient (B) to form binary compounding, and has obvious synergistic effect on preventing and killing grassy weeds of large grass age.

Indoor toxicity test

The determination method comprises the following steps:

transplanting perennial weeds, namely the palea hirta and the cylindracea into black plastic nutrition cups (the diameter is 20cm) filled with nutrient soil, and culturing 10 plants in each cup in a greenhouse for later use.

The medicament is completely dissolved by acetone to prepare mother liquor, and the mother liquor is gradually diluted to the required concentration according to the requirement of experimental design dosage.

Spraying stem and leaf. Spraying stem and leaf with raw measuring spray tower, adding water 100ml/m²Droplet diameter 100 μm, nozzle flow 90 mL/min^-1And a clear water contrast is set. Weighing the fresh weight of the overground part of weeds 30 days after the treatment, and calculating the fresh weight control effect.

Specifically, the Gowing method is used for evaluating the combined action type of two herbicides, and the theoretical control effect of the mixed herbicide is calculated according to the following formula:

in the formula: when the dosage of X is P, the herbicide A is used singly to achieve the percentage control effect;

y is the single-use percentage control effect of the herbicide B when the using amount is Q;

E₀the theoretical control effect of the herbicide (A + B) when the dosage is (P + Q);

e is the actual control effect of the herbicide (A + B) when the dosage is (P + Q);

when E-E₀Antagonism is indicated when < -10 >, and E-E is indicated when-10 < E-E₀Addition when < 10, when E-E₀The synergistic effect is more than 10.

TABLE 1 evaluation of the control of the compounded reagents in different proportions

As can be seen from the data in the table, the fresh weight control effect of the compound of glufosinate-ammonium and quizalofop-p-ethyl on the palea hirta and the boehmeria cylindrica is far greater than that of each single agent, and the E-E in the proportion₀>10 percent, so the glufosinate-ammonium and quizalofop-p-ethyl have obvious synergistic effect after being compounded, and particularly the control effect on gramineous weeds difficult to control is obviously improved.

(II) field herbicide efficacy test