CN105685049A - Sorghum field weeding composition and application thereof - Google Patents

Abstract

The invention belongs to the field of pesticides, and in particular relates to a sorghum field herbicidal composition containing bisfentrazone and its application. The herbicidal composition for sorghum fields comprises a herbicidally effective amount of the active ingredient bisfenzone and the active ingredient B, wherein the active ingredient bisfenzone has the structural formula: The active ingredient B is selected from one or more of the following compounds: 1) HPPD inhibitors: mesotrione; 2) quinoline carboxylic acids: quinclorac. The composition can effectively control broadleaf weeds and some grass weeds in sorghum fields, and has the characteristics of expanding herbicidal spectrum, reducing application amount, being safe to crops, and the like.

Description

A kind of sorghum field herbicide composition and its application

technical field

The invention belongs to the field of pesticides, and in particular relates to a sorghum field herbicidal composition containing bisfentrazone and an application thereof.

Background technique

Hydroxyphenylpyruvate dioxygenase (HPPD) was discovered after inhibitors of acetyl-CoA carboxylase (ACCase), acetolactate synthase (ALS) and protoporphyrinogen oxidase (Protox), etc. Another class of new herbicides. The action of HPPD inhibitors is characterized by broad-spectrum herbicidal activity, which can be used both before and after emergence, and the weeds will die after albinism. Although its symptoms are very similar to those of carotenoid bioinhibitors, its chemical structure characteristics such as polarity and degree of ionization are significantly different from those of known carotenoid bioinhibitors. Among them, bisfentrazone is a typical HPPD inhibitor.

Sorghum belongs to economic crops, Gramineae and sorghum are annual herbaceous plants. Sex likes warmth, drought resistance and waterlogging tolerance. According to its properties and uses, it can be divided into edible sorghum, sugar sorghum, and broom sorghum. It is widely cultivated in China, with the most in Northeast China. Edible sorghum grains are used for food and wine making. Sugar sorghum stalks can be used to make syrup or raw food; broom sorghum ears can be used to make brooms or cooking brooms; chemical weed control with herbicides is the most economical and effective means of weed control in farmland. However, as a small crop, sorghum has a small planting area, and the available herbicides are very limited. At present, the herbicides used in sorghum mainly include atrazine, 2,4-D butyl ester and a few varieties with low activity or narrow herbicidal spectrum. There is an urgent need for varieties with wider herbicidal spectrum and better safety in production.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a sorghum field herbicidal composition containing bisfentrazone and its application, the composition can effectively control broadleaf weeds and some gramineous weeds in the sorghum field Grass has the characteristics of expanding the herbicidal spectrum, reducing the amount of application, and being safe to crops.

A herbicidal composition for sorghum fields, which includes a herbicidally effective amount of the active ingredient bisfentrazone and the active ingredient B, wherein,

The structural formula of the active ingredient bisfentrazone is

Active ingredient B is selected from one or more of the following compounds:

1) HPPD inhibitors: mesotrione;

2) Quinoline carboxylic acids: quinclorac.

An application of a herbicidal composition in a sorghum field, the herbicidal composition comprising a herbicidally effective amount of active ingredient bisfentrazone and active ingredient B, wherein,

The structural formula of the active ingredient bisfentrazone is

Active ingredient B is selected from one or more of the following compounds:

1) Phenoxycarboxylic acids: 2-methyl-4-chloride, 2-methyl-4-chloro-ethylthioester, MCPB, 2-methyl-4-chloropropionic acid, 2-methyl-4-chloro-sodium, 2-methyl-4-chloro-isooctyl, 2,4-D butyl ester, 2,4-D isooctyl ester, 2,4-dichlorophenoxyacetic acid, 2,4-DB, 2,4-dipropionic acid;

2) Pyridine carboxylic acids: fluroxypyr, isooctyl fluroxypyr, fluroxypyr, triclopyr, diclopyr;

3) Benzoic acids: dicamba;

4) Hydroxybenzonitriles: bromoxynil, octanoyl bromoxynil, iodoxenil;

5) Triazolinones: fentrazone;

6) Diphenyl ethers: acifluorfen;

7) Sulfonylureas: Clopyrazosulfuron-methyl;

8) Triazines: atrazine, metrizone, promethazine, terbufen;

9) Sulfonamides: diflusulam, flumesulam, penoxsulam;

10) HPPD inhibitors: mesotrione;

11) Quinoline carboxylic acids: quinclorac;

12) Others: bentazone.

Preferably, the active ingredient B is 2-methyl-4-chlorosodium, 2-methyl-4-chloro-isooctyl, 2,4-D butyl ester, 2,4-D isooctyl ester, fluroxypyr, fluroxypyr Isooctyl oxyacetate, fluchlorpyrid, mefentrazone, fluorfen, chlorpyrazosulfuron, atrazine, florasulam, flumesulam, bentazone, bromoxynil , one or more of bromoxynil, mesotrione, and quinclorac.

Wherein, the weight ratio of bisfenzone to B is 1-100:1-100, preferably the weight ratio of bisfenzone to B is 1-80:1-80, 1-50:1-50, 1-30 : 1-30, more preferably the weight ratio of bisfenzone and B is 1-20:1-20, 1-10:1-10, within the scope of the defined weight ratio, active ingredient bisfenzone and B Active ingredient B is blended to achieve a synergistic technical effect.

The mass percentage of bisfentrazone and B in the herbicidal composition accounts for 1-95% of the total, preferably 10-80%. Usually, the herbicidal composition of the present invention comprises 1-95 parts by weight of active ingredients and 5-99 parts by weight of conventional pesticide adjuvants.

Conventional auxiliaries of the composition of the present invention may be carriers, surfactants and the like.

The term "carrier" herein means an organic or inorganic, natural or synthetic substance. They facilitate the application of the active ingredient, the carrier being generally inert and must be agriculturally acceptable, especially by the plant to be treated. The carrier can be solid, such as clay, natural or synthetic silicates, silica, resins, waxes, solid fertilizers, etc.; or liquid, such as water, alcohols, ketones, petroleum distillates, aromatic or wax hydrocarbons, chlorine Substituted hydrocarbons, liquefied petroleum gas, etc.

Surfactants may include emulsifying, dispersing or wetting agents, which may be ionic or nonionic. Examples that may be mentioned are the salts of polyacrylic acid, lignosulfonates, phenolsulfonic acids or naphthalenesulfonic acids, ethylene oxide with aliphatic alcohols or with aliphatic acids or with aliphatic amines with substituted phenols (in particular are polymers of alkylphenols or arylphenols), sulfosuccinates, taurine derivatives (especially alkyl taurates) and phosphate esters of alcohols or polyhydroxyethylated phenols, Alkyl sulfonates, alkyl aryl sulfonates, alkyl sulfates, lauryl ether sulfates, fatty alcohol sulfates, and sulfated cetyl, heptadecanyl and stearyl alcohols and sulfated fatty alcohols Glycol ethers, also condensates of naphthalene or naphthalenesulfonic acid with phenol and formaldehyde, polyoxyethylene octylphenyl ethers, ethoxylated isooctylphenols, octylphenols or nonylphenols, alkylbenzenes Polyethylene glycol ether, tributylphenyl polyethylene glycol ether, tristearylphenyl polyethylene glycol ether, alkyl aryl polyether alcohol, alcohol and fatty alcohol/ethylene oxide condensate, ethoxy castor oil, polyoxyethylene alkyl ether, ethoxylated polyoxypropylene, lauryl polyglycol ether acetal, sorbitol ester, lignosulfite waste liquor, and protein, denatured protein, polysaccharide (such as methylcellulose), hydrophobically modified starches, polyvinyl alcohols, polycarboxylates, polyalkoxylates, polyvinylamines, polyvinylpyrrolidone and their copolymers. At least one surfactant needs to be present to facilitate dispersion of the active ingredients in water and to facilitate their proper application to the plants.

The above compositions may also contain various other components such as protective colloids, binders, thickeners, thixotropes, penetrants, stabilizers, chelating agents, dyes, colorants and polymers.

The compositions of the present invention may be diluted before use or used directly by the user. Its preparation can be prepared by common processing methods, that is, after mixing the active substance with a liquid solvent or a solid carrier, and then adding one or more surfactants such as dispersants, stabilizers, wetting agents, adhesives, defoamers, etc. kind.

The specific formulation of the herbicidal composition is emulsifiable concentrate, suspension concentrate, microemulsion, suspoemulsion, water emulsion, dispersible oil suspension, wettable powder or water dispersible granule (dry suspension).

When the composition is made into a wettable powder, it contains the following components: 1-70% of active ingredient bisfentrazone, 1-50% of active ingredient B, 5-10% of dispersant, 2-10% of wetting agent and the balance of filler.

Mix active ingredient bisfentrazone, active ingredient B, dispersant, wetting agent, and filler, mix uniformly in a mixing tank, pulverize through a jet mill, and then mix uniformly to prepare the wettable powder of the composition of the present invention product.

When the composition is made into water-dispersible granules, it includes the following components: 1-70% of the active ingredient bisfentrazone, 1-50% of the active ingredient B, 3-12% of the dispersant, 1-8% of the wetting agent, and a disintegrant 1-10%, binder 1-8%, filler balance.

The active ingredient bisfentrazone, active ingredient B, dispersant, wetting agent, disintegrating agent, filler, etc. are air-pulverized together to obtain the required particle size, and then other additives such as binder are added to obtain the granulation material . The water-dispersible granule product of the composition of the present invention is obtained by quantitatively sending the material into a fluidized bed granulation dryer for granulation and drying.

When the composition is made into a suspension, it includes the following components: 0.1-40% of the active ingredient bisfentrazone, 0.1-30% of the active ingredient B, 2-10% of the dispersant, 2-10% of the wetting agent, and an antifoaming agent 0.1-1%, binder 0.1-2%, antifreeze agent 0.1-8%, and deionized water to 100%.

The dispersant, wetting agent, defoamer, thickener, and antifreeze agent in the above formula are mixed evenly through high-speed shearing, and the active ingredient bisfentrazone and active ingredient B are added, and ball milled in a ball mill for 2 to 3 hours. The particle size of the particles is all below 5 μm to prepare the suspension product of the composition of the present invention.

When the composition is made into a suspoemulsion, the following components are included: 0.1-40% of the active ingredient bisfentrazone, 0.1-30% of the active ingredient B, 2-12% of the emulsifier, 2-10% of the dispersant, and an antifoaming agent 0.1-2%, thickener 0.1-2%, antifreeze agent 0.1-8%, stabilizer 0.05-3%, water added to 100%.

Mix the dispersant, defoamer, thickener, antifreeze, and stabilizer in the above formula evenly through high-speed shearing, add active ingredient B original drug, and ball mill in a ball mill for 2 to 3 hours to make the particle size completely Below 5 μm, the active ingredient B suspending agent is prepared, and then the active ingredient bisfentrazone original drug, emulsifier and various auxiliary agents are directly emulsified into the suspending agent with a high-speed mixer to prepare the suspoemulsion of the composition of the present invention product.

When the composition is made into an emulsion in water, the following components are included: 0.1% to 40% of the active ingredient bisfentrazone, 0.1% to 30% of the active ingredient B, 2% to 10% of the solvent, 2% to 12% of the emulsifier, Dispersant 2% to 10%, co-emulsifier 0.2% to 5%, antifreeze agent 0.1% to 8%, defoamer 0.1% to 2%, thickener 0.1% to 2%, deionized water to 100 %.

Add the original drug, solvent, emulsifier, and co-emulsifier in the above formula together to dissolve into a uniform oil phase. Mix deionized water, dispersant, antifreeze, defoamer, and thickener together to form a uniform water phase, and slowly drop the water phase into the oil phase under high-speed stirring to prepare the dispersed composition of the present invention. Good emulsion in water product.

When the composition is made into a microemulsion, the following components are included: 0.1%-40% of the active ingredient bisfentrazone, 0.1%-30% of the active ingredient B, 5%-15% of the emulsifier, 2%-10% of the solvent, Add 5% to 10% of antifreeze, 0.5% to 3% of stabilizer, and add deionized water to 100%.

Add the original medicine, solvent, and emulsifier in the above formula into the mother liquor preparation kettle to obtain a uniform oil phase, mix deionized water, antifreeze, etc. into the product preparation kettle, stir at a high speed, and mix evenly to make the combination of the present invention Transparent or translucent microemulsion products.

Briefly, the compositions of the present invention can be mixed with solid and liquid additives conventionally used in prior art formulations.

In a further preferred form of implementation, the herbicidal composition also includes a safener C, which is selected from the group consisting of mefenpyr-ethyl, quincetidine, isoxadifen, cyprosulfamide (CAS No.: 221667-31-8), naphthalene Diformic Anhydride (NA), Chlorazole, R-28725, AD-67, CGA-154281 (Benoxacor), CGA-43089 (Cyometrinil), CGA-43089 (Cyometrinil), Hoe-70542 (Fenchlorazole), Fenchlorazole Ketone (Fenclorim), Jiecaan, BAS-145138, MON-13900, quinoline derivatives, sulfonylurea (amine) safeners, 2,4-D (organic acids), new antidote T (main ingredient 4% Ti ⁴⁺ ) and one or more of gibberellin (GA).

The composition of the present invention can be applied by spraying on the leaves of the plants to be treated, i.e. on surfaces infested by weeds, especially weeds harmful to crop growth or susceptible to infestation, and the application doses of these active ingredients are usually At 15-1500 g/ha, preferably 30-750 g/ha.

The 2-year field efficacy test of the herbicidal composition of the present invention shows that in the sorghum 3-leaf stage to the 5-leaf stage, the weeds have different stages from 1-5 leaves, and sorghum has no phytotoxicity symptoms from the application to the mature stage. Safe for sorghum. The control effect of weeds reaches over 90% within 45 days. With the increase of dosage, the control effect increases obviously. One application of pesticide can control the weeds in the whole growth period of crops. Not only the weeding effect is remarkable, but also the environment is friendly It has no effect on the following crops.

The herbicidal composition of the present invention also has the following advantages:

(1) The composition of the present invention belongs to the environment-friendly herbicide, is easy to degrade in the environment, and is very safe to the current sorghum and subsequent crops.

(2) The herbicidal composition of the present invention has a wide herbicidal spectrum, high safety, low cost, and convenient use, and its popularization and application will have huge economic and social benefits.

detailed description

The following examples do not limit the present invention, but are only used to illustrate how the present invention is realized. For certain weeds, the examples showed particularly marked effectiveness.

A. Examples

1) Cream

1.1), the active ingredient bisfentrazone, when the active ingredient B is aciflufen.

The formula is composed of: 2.5% bifentrazone + 0.5% fluorfen-ethanol + 5% cyclohexanone + 5% calcium dodecylbenzenesulfonate + 5% phenylethylphenol polyoxyethylene ether + 100# aromatics Solvent make up.

1.2), the active ingredient bisfentrazone, when the active ingredient B is 2,4-D isooctyl ester.

The formula is composed of: 2.5% bisfentrazone + 25% 2,4-D isooctyl ester + 5% cyclohexanone + 4% calcium dodecylbenzenesulfonate + 6% nonylphenol polyoxyethylene ether + 100 #Aromatic solvent oil make up.

1.3), the active ingredient bisfentrazone, when the active ingredient B is bromoxynil octanoyl.

The formula is composed of: 2.5% bisfentrazone + 25% bromoxynil capryl + 5% N-methylpyrrolidone + 4% calcium dodecylbenzenesulfonate + 5% fatty alcohol polyoxyethylene ether + 100# aromatics Solvent make up.

The processing equipment for the above-mentioned emulsifiable concentrate: vacuum pump, batching kettle, storage tank.

The processing process of the above-mentioned emulsifiable cream: put all the materials into the batching kettle, stir and dissolve until completely transparent, and transfer to the storage tank for filling after passing the test.

2) Microemulsion

2.1), the active ingredient bisfentrazone, the active ingredient B is fluroxypyr.

The formula is composed of: 5% bisfentrazone + 12% fluroxypyr acetic acid + 10% cyclohexanone + 10% ethanol + 8% sodium cis-butene dioctyl sulfonate + 8% phenylethylphenol polyoxygen Vinyl ether + 3% phenethylphenol polyoxyethylene ether formaldehyde resin condensate + water to make up.

The above-mentioned microemulsion processing equipment: vacuum pump, batching kettle, storage tank.

The above microemulsion processing process: Put the original drug and solvent into the batching kettle, stir and dissolve until completely transparent, then add emulsifier, stir evenly, finally add water, stir until the solution is completely transparent, after passing the test, transfer to the storage tank for filling.

3) water emulsion

3.1), the active ingredient bisfentrazone, the active ingredient B is 2-methyl-4-chloroisooctyl.

The formula is composed of: 2.5% bisfentrazone + 24.5% 2-methyl-4-chloroisooctyl ester + 5% cyclohexanone + 3% phenethylphenol polyoxyethylene ether phosphate triethanolamine salt + 2% phenethylphenol polyoxyethylene ether Oxyethylene ether + 3% castor oil polyoxyethylene ether + 3% ethylene glycol + water make up.

3.2), the active ingredient bisfentrazone, the active ingredient B is fluclopyridine.

The formula is composed of: 2.5% bisflumezone + 0.5% fluchlorpyridine ester + 10% cyclohexanone + 10% 150# solvent oil + 3% nonylphenol polyoxyethylene ether phosphate triethanolamine salt + 2% styrene Base phenol ethoxylate + 3% castor oil ethoxylate + 3% ethylene glycol + water to make up.

The above water emulsion processing equipment: vacuum pump, batching kettle, storage tank, shearing kettle.

The above water emulsion processing process: put the original drug and solvent into the batching kettle, stir and dissolve until completely transparent, then add emulsifier, stir evenly to form an oil phase, and then pump ethylene glycol, defoamer and water into the shearing kettle , and finally in the shearing state, slowly pump the oil phase into the shearing kettle. After all the materials are pumped in, continue to shear for 1 hour. After passing the test, transfer to the storage tank for filling.

4) Suspending agent

4.1), the active ingredient bisfentrazone, when the active ingredient B is atrazine.

The formula is composed of: 2.5% bisfentrazone + 47.5% atrazine + 5% naphthalene sulfonate + 2% fatty alcohol polyoxyethylene ether + 0.1% xanthan gum + 5% glycerol + water to make up.

4.2), the active ingredient bisfentrazone, when the active ingredient B is 2-methyl-4-chlorodimethylamine salt.

The formula is composed of: 2.5% bisfentrazone + 19.5% 2-methyl-4-chlorodimethylammonium salt + 5% polycarboxylate dispersant + 2% fatty alcohol polyoxyethylene ether + 0.3% xanthan gum + 5% acrylic acid Triol + remaining water to make up.

The above-mentioned suspending agent processing equipment: mixing kettle, colloid mill, sand mill, shearing machine, etc.

The above-mentioned suspending agent processing process: Put all the materials into the mixing tank, stir and mix, pass through the colloid mill, then enter the third-stage sand mill of the sand mill, and finally cut evenly in the shearing machine. After passing the test, transfer to the storage tank filling.

5) Dispersible oil suspension

5.1), the active ingredient bisfentrazone, when the active ingredient B is bromoxynil.

The formula is composed of: 2.5% bisfentrazone + 17.5% bromoxynil + 5% phenylethylphenol polyoxyethylene ether phosphate triethanolamine salt + 5% fatty acid polyoxyethylene ester + 8% castor oil polyoxyethylene ether + 2% organobentonite + methyl oleate make up.

5.2), the active ingredient bisfentrazone, when the active ingredient B is bentazone.

The formula is composed of: 1.5% bisfentrazone + 36% bentazone + 5% sodium cis-butene di-sec-octyl sulfonate + 5% nonylphenol polyoxyethylene ether + 8% castor oil polyoxyethylene ether + 0.5 % Organobentonite + methyl oleate make up.

5.3), the active ingredient bisfentrazone, when the active ingredient B is florasulam.

The formula is composed of: 5% bifentrazone + 1% florasulam + 5% sodium cis-butene di-sec-octyl sulfonate + 5% sorbitan fatty acid polyoxyethylene ester + 4% nonylphenol polyoxyethylene Oxyethylene ether + 2.6% organic bentonite + 25% soybean oil + methyl oleate to make up.

5.4) The active ingredient bisfentrazone, when the active ingredient B is mesotrione.

The formula is composed of: 2.5% bisfentrazone + 10% mesotrione + 5% sodium cis-butene di-sec-octyl sulfonate + 5% sorbitan fatty acid polyoxyethylene ester + 4% nonylphenol polyoxyethylene Vinyl ether + 2.6% organic bentonite + 25% soybean oil + methyl oleate make up.

5.5) The active ingredient bisfentrazone, when the active ingredient B is quinclorac.

The formula is composed of: 2.5% bisfentrazone + 20% quinclorac + 5% sodium cis-butene dioctyl sulfonate + 5% sorbitan fatty acid polyoxyethylene ester + 4% nonylphenol polyoxyethylene Vinyl ether + 2.6% organic bentonite + 25% soybean oil + methyl oleate make up.

The processing process of the above-mentioned dispersible oil-suspending agent: put all the materials into the mixing tank, pass through the colloid mill after stirring and mixing, and then enter the third-stage sand mill of the sand mill, and finally cut evenly in the shearing machine. After passing the test, transfer To tank filling.

6) wettable powder

6.1), the active ingredient bisfentrazone, when the active ingredient B is atrazine.

The formula is composed of: 3% bisfentrazone + 30% atrazine + 8% naphthalene sulfonate + 5% fatty alcohol polyoxyethylene ether + 5% precipitated white carbon black + calcined kaolin to make up.

6.2), the active ingredient bisfentrazone, when the active ingredient B is sodium 2-methyl-4-chloride.

The formula is composed of: 5% bifentrazone + 35% sodium 2-methyl-4-chloride + 6% polycarboxylate dispersant + 5% fatty alcohol polyoxyethylene ether + 5% precipitated white carbon black + calcined kaolin supplement.

The above-mentioned wettable powder processing equipment: mechanical pulverizer, jet pulverizer.

The above-mentioned wettable powder processing process: put the original drug, additives, white carbon black, kaolin, etc. into a mechanical pulverizer, and then pass through the jet pulverizer, and take a sample for use after passing the test.

7) Water dispersible granules

7.1), the active ingredient bifentrazone, when the active ingredient B is metafentrazone.

The formula is composed of: 2.5% bisfentrazone + 0.5% fentrazone + 10% naphthalene sulfonate + 5% pull open powder + 1% disintegrant polyvinyl alcohol + filler diatomaceous earth to supplement.

7.2), the active ingredient bifentrazone, when the active ingredient B is metrimezone.

The formula is composed of: 2.5% bisfentrazone + 11.5% mecitrazone + 10% polycarboxylates + 5% polyethylene glycol + 1% disintegrating agent polyvinyl alcohol + diatomaceous earth as a supplement.

7.3) The active ingredient bisfentrazone, when the active ingredient B is closulfuron-methyl.

The formula is composed of: 15% bifentrazone + 24% pyrazosulfuron-methyl + 20% polycarboxylates + 5% polyethylene glycol + 1% disintegrating agent polyvinyl alcohol + filler diatomaceous earth to supplement.

The above-mentioned water-dispersible granules processing equipment: jet mill, coulter mixer, basket granulator, drying oven, sieving machine, etc.

The processing process of the water-dispersible granules mentioned above: the above-mentioned materials are mixed uniformly and pulverized by airflow, added water into the kneaded granules, then dried, and finally sieved to obtain the finished product.

B. Efficacy

The herbicide composition prepared in Examples 1.1-7.3 was used to control weeds in sorghum fields.

Test method: the weed seeds are uniformly germinated, and the pretreated weed seeds for testing are evenly spread on the soil surface. Before spraying, the seedlings were thinned to 30 plants per pot, and 4 pots of test materials were used for each treatment. Carry out stem and leaf spraying treatment to weeds, investigate the number of dead plants, calculate the control effect of weeds (the control effect of plants in the table is the average value of 4 repetitions), and count the test situation after 45 days of the test, the results are shown in Table 1:

Table 1 herbicide of the present invention is to the control effect of sorghum field weeds

As can be seen from the test results in the table, the composition of the present invention has a good control effect on the broad-leaved weed barnyardgrass in sorghum fields, and the active ingredient bisfentrazone and 2-methyl-4-chloride sodium, 2-methyl-4-chloroisooctyl Esters, 2-methyl-4-chlorodimethylammonium salts, 2,4-D isooctyl esters, fluroxypyr acetic acid, fluroxypyridine esters, mefentrazone, fluroxyfen-ethanol, chlorpyrazosulfuron-methyl, atrazine , metrizone, florasulam, bentazone, bromoxynil, bromoxynil octanoyl, mesotrione, and quinclorac have significant synergistic effects among the active ingredients. The synergistic effect of barnyardgrass is particularly obvious, and it is safe for sorghum. As stem and leaf treatment agents, emulsifiable concentrates, microemulsions, water emulsions, suspension concentrates, dispersible oil suspension concentrates, wettable powders, and water dispersible granules have shown good convenience in the process of spraying, and have good effects on weeds. The control effect is outstanding, and at the same time, the safety of crops is greatly improved.

2) Demonstration test of the composition of the present invention for controlling weeds in sorghum field

In 2015, a demonstration promotion test was carried out in 20 test points in 4 provinces of Heilongjiang, Jilin, Liaoning and Inner Mongolia. See Table 2 for details of sorghum varieties in different demonstration areas.

Table 2 Sorghum varieties in different demonstration areas

Demonstration Area sorghum variety Heilongjiang Longza No. 8, Longza No. 10 Jilin Jiza 118 liaoning Tieza No. 16 Inner Mongolia Tongza 108

Test method: After 3 leaves and 1 heart of sorghum, weeds at the 3-5 leaf stage, manual sprayer, water volume 15 kg/667m ² , spray evenly with stem and leaf spray, see Table 3 for the specific test chemicals and dosage, the area of the plot is 50 square meters , each treatment was repeated 4 times. See Table 3 for the survey control effect 45 days after spraying, and Table 4 for the safety of sorghum.

Table 3 Field Demonstration Effects

Table 4 Safety situation of field demonstration sorghum

Note: The main weed community types in each demonstration site: Heilongjiang: Barnyardgrass + Amaranthus retroflexus; Jilin: Barnyardgrass + Amaranthus retroflexus + Chenopodium; Liaoning: Barnyardgrass + Amaranthus retroflexus; Inner Mongolia: Barnyardgrass + Amaranthus retroflexus.

After a lot of experiments and explorations, the present invention unexpectedly finds that bisfentrazone is used in combination with the active ingredient B for post-emergence control of broadleaf weeds and barnyardgrass in sorghum fields, which has a surprising and unexpected synergistic effect, Especially it has obvious synergistic effect on amaranth, quinoa, barnyardgrass and cruciferous weeds. At the same time, it can reduce the dosage, improve crop safety, reduce environmental pollution, and reasonable compounding reduces agricultural costs. Has great prospects.

Claims (10)

1. a sorghum field Herbicidal combinations, it is characterised in that include active component polybenzobisoxazole oxadiazon and the active component B of herbicidally effective amount, wherein,

Active component polybenzobisoxazole oxadiazon structural formula is

Active component B is selected from one or more in following compound:

1) HPPD inhibitor class: mesotrione；

2) quinoline carboxylic acid: dichloro quinolinic acid。

2. a kind of sorghum field Herbicidal combinations according to claim 1, it is characterised in that the weight ratio of polybenzobisoxazole oxadiazon and B is 1-100:1-100, it is preferred to 1-50:1-50, more preferably 1-20:1-20。

3. the Herbicidal combinations application in sorghum field, it is characterised in that described Herbicidal combinations includes active component polybenzobisoxazole oxadiazon and the active component B of herbicidally effective amount, wherein,

Active component polybenzobisoxazole oxadiazon structural formula is

Active component B is selected from one or more in following compound:

1) phenoxy carboxylic acid: 2 first 4 chlorine, 2 first 4 chloroethene thioesters, MCPB, Vi par, 2 first 4 chlorine sodium, the 2 first 4 different monooctyl esters of chlorine, 2 first 4 chlorine dimethylamine salts, 2, the different monooctyl ester of 4-D butyl ester, 2,4-D, 2,4 dichloro benzene ethoxyacetic acid, 2,4-DB, 2,4-drip propanoic acid；

2) picolinic acid class: the different monooctyl ester of fluroxypyr, fluroxypyr, fluorine chloropyridine ester, trichlopyr, clopyralid；

3) benzoic acids: Mediben；

4) hydroxy benzonitrile class: Brominal, bromoxynil octanoate, ioxynil；

5) triazolineone: azoles oxadiazon；

6) diphenylether: fluoroglycofen-ethyl；

7) sulfonylurea: halosulfuronmethyl；

8) triazines: atrazine, metribuzin, prometryn, terbutryn；

9) sulfonamides: florasulam, Flumetsulam, penoxsuam；

10) HPPD inhibitor class: mesotrione；

11) quinoline carboxylic acid: dichloro quinolinic acid；

12) other: bentazone。

4. a kind of Herbicidal combinations according to claim 3 application in sorghum field, it is characterized in that, described active component B be 2 first 4 chlorine sodium, the 2 first 4 different monooctyl esters of chlorine, 2, one or more in 4-D butyl ester, 2,4-D different monooctyl esters, fluroxypyr, the different monooctyl ester of fluroxypyr, fluorine chloropyridine ester, azoles oxadiazon, fluoroglycofen-ethyl, halosulfuronmethyl, atrazine, florasulam, Flumetsulam, bentazone, Brominal, bromoxynil octanoate, mesotrione, dichloro quinolinic acid。

5. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterised in that the weight ratio of polybenzobisoxazole oxadiazon and B is 1-100:1-100, it is preferred to 1-50:1-50, more preferably 1-20:1-20。

6. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterised in that in described Herbicidal combinations, the weight/mass percentage composition of polybenzobisoxazole oxadiazon and B accounts for the 1-95% of total amount, it is preferable that 10-80%。

7. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterised in that described Herbicidal combinations also comprises pesticide conven-tional adjuvants；Preferably, described pesticide conven-tional adjuvants includes carrier, surfactant。

8. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterized in that, the concrete preparation of described Herbicidal combinations is cream, suspending agent, microemulsion, suspension emulsion, aqueous emulsion, dispersibles oil-suspending agent, wettable powder or water dispersible granules。

9. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterised in that described Herbicidal combinations also includes safener C；Preferably, described safener C selected from mefenpyrdiethyl, cloquintocetmexyl, isoxadifen, cyprosulfamide, naphthalic anhydride, chlorine oxalene peace, R-28725, AD-67, CGA-154281, CGA-43089, CGA-43089, Hoe-70542, benoxacor, flurazole, BAS-145138, MON-13900, quinoline, sulfonylureas (amine) class safener, 2,4-D, one or more in novel Antidote T and gibberellins。

10. the application in sorghum field of a kind of Herbicidal combinations according to claim 3 or 4, it is characterised in that described Herbicidal combinations is used for broad leaved weeds and the barnyard grass of preventing and kill off in sorghum field。