CN104304297A - Weeding composition containing metamifop - Google Patents

Abstract

The invention relates to a herbicide composition, and particularly relates to a weeding composition containing chlorpromazine sulfometuron methyl and metamifop as active ingredients for preventing and removing weeds of a paddy field. The weight ratio of the active ingredients chlorpromazine sulfometuron methyl to metamifop in the composition is (1:40) to (32:5); and the percent content of the active ingredients in the composition is 1-80%. The weeding composition is reasonable in components, and good in weed effect; the herbicide controlling spectrum is expanded; the drug delivery times is reduced; the prevention and control cost is reduced; the weed insecticide resistance is delayed; and the weeding composition is safe to rice and is an ideal herbicide.

Description

A kind of Herbicidal combinations of Han You metamifop

[technical field]

The invention belongs to technical field of pesticide, be specifically related to a kind of with promazine Sulfometuron Methyl with the metamifop herbicidal composition that is active component, for preventing and kill off paddy field weed.

[background technology]

China is large agricultural country, and paddy rice is one of maximum crops of China's cultivated area, and in order to ensure high yield, the stable yields of paddy rice, country has carried out the input of each side, especially the applying of science and technology.Paddy rice often suffers the harm of various weeds in vegetative period, and these weeds have very strong vitality, fights for nutrition, moisture, sunlight, growing space etc., have a strong impact on growing of rice seedling with rice seedling, causes rice yield to decline and even has no harvest.Along with the development of agricultural cience and farming techniques, applying of chemical herbicide becomes saving of labor, saves time, one of the strong well stimulation of cost-saving.The direction of pesticide developing embodies efficient, low toxicity, low-residual and pollution-free in recent years, is embodied in pursuits " three height " namely: safety is high, biologically active is high, selectivity is high.Therefore, need to continue to improve the performance of current Pesticidal products, to reach efficient, low toxicity, free of contamination requirement.Select suitable agricultural chemicals to carry out compositely just having become current first-selection and the effective approach of one, make the agricultural chemicals of performance complement play best drug effect by the proportioning adjusting different compound.

Promazine Sulfometuron Methyl is by the pyrimidine radicals sulfonylurea selectivity broad-spectrum herbicide of SUMITOMO CHEMICAL chemistry exploitation, identical with the mechanism of action of other sulfonylurea herbicides, promazine Sulfometuron Methyl is also acetolactate synthestase (ALS) inhibitor, but the weeds of its antagonism sulfonylurea herbicide have good preventive effect, the effect of tool residual effect, effectively can prevent and kill off multiple broad-leaved and the sedge weed such as firefly Lin, Monochoria vaginalis, Procumbent Falsepimpernel, mexicana, waterwort, Herba Cyperi Glomerati, false loosestrife, cyperus iria in paddy field, but invalid to other grassy weeds except barnyard grass.

Metamifop is the aryloxyphenoxypropanoates class weed killer herbicide developed by Chemical Engineering Technology research institute of Korea S, belong to acetyl-CoA carboxylase (ACCase) inhibitor, whole plant can be conducted to rapidly after active ingredient is absorbed by grass cutting blade, be accumulated in plant meristematic tissue, suppress the activity of acetyl-CoA carboxylase, fatty acid biosynthesis block is caused to cause yellowing leaf, finally kill weeds, it effectively can prevent and kill off the main grassy weed of paddy field, low toxicity, environmentally safe, there is miscibilty widely, and be expected to for other crops and Kill weeds, it is very promising weed killer herbicide, but this weed killer herbicide to broad-leaved and sedge weed invalid.

Existing a lot of bibliographical information crosses the herbicidal composition containing promazine Sulfometuron Methyl Huo metamifop, such as patent CN103271066A discloses promazine Sulfometuron Methyl and pyrazosulfuron compound for agent for removing grass in paddy field, the two active component mechanisms of action are identical, and the preventive effect of composition to the main grassy weed in rice field is poor; The herbicidal composition of patent CN101965838A Gong Kai metamifop and cyhalofop-butyl mixture, the two active component mechanisms of action are identical, herbicide spectrum similar, composition only has special efficacy to grassy weed, to broad-leaved and sedge weed invalid; Patent CN102724876A describes and comprises fluroxypyr with the Synergistic herbicidal compositions of metamifop, in order to control unwanted vegetation in paddy field, should can also be co-administered with the less desirable vegetation controlling wider scope with other weed killer herbicides such as propyrisulfuron (promazine Sulfometuron Methyl) further containing composition of two kinds of active components, but not yet there is document to be disclosed promazine Sulfometuron Methyl Yu the composite separately composition of metamifop, also support without relevant raw data of surveying.

In order to make up above each single dose and report the deficiency that complex preparation exists in actual application, the present inventor furthers investigate, unexpected discovery on the basis of the screening of a large amount of formula indoors and field control effectiveness test, promazine Sulfometuron Methyl is Yu metamifop is composite in certain ratio range, to paddy field weed, there is excellent control efficiency, the preventive effect shown and activity level exceed the superposition of each component, there is unexpected synergistic function, solve above two kinds of weed killer herbicides to compose in herbicide, the limitation that preventive effect and safety exist, reach and expand herbicide spectrum, improve preventive effect, improve the object of safety.

[summary of the invention]

The object of the invention is to the present situation according to current herbicide for paddy field, and paddy field weed a situation arises, a kind of herbicidal composition for agent for removing grass in paddy field of safe, efficient, wide spectrum is provided.

For realizing object of the present invention, the invention discloses a kind of herbicidal composition, it is made up of a and b two kinds of active components of effective dose.

Wherein, active component a is promazine Sulfometuron Methyl (Propyrisulfuron); other titles: piperazine imidazoles Sulfometuron Methyl; chemical name: 1-(the chloro-6-propyl imidazole [1 of 2-; 2-b] and pyridazine-3-base sulfonyl)-3-(4; 6-dimethoxypyridin-2-base) urea, structural formula is:

Active component b Wei metamifop (Metamifop), other titles: Han Qiuhao, chemical name: (2R)-2-[4-[(6-chloro-2-Ben oxazolyl)] phenoxy group]-N-(2-fluorobenzene)-N-methyl propanamide, structural formula is:

The weight ratio of described active component a and b is: a promazine Sulfometuron Methyl: b metamifop=1:40 ~ 32:5, and be preferably 1:10 ~ 8:5, more preferably 2:5, the weight percentage of two active components in herbicidal composition is 1 ~ 80%; The amount of application when content of active component depends on that often kind of component is used alone in herbicidal composition of the present invention, also depends on the ratio of a kind of component and another kind of component and the degree of synergistic effect.

Herbicidal composition of the present invention, except two kinds of active ingredients, can also add carrier, adhesive, disintegrant, dispersant, wetting agent etc. and other contribute to the active ingredient known substance that plays of stable and drug effect in the formulation.

Herbicidal composition of the present invention can be processed into the various formulations of the applicable agricultural uses such as wetting powder, granule, suspending agent, and preferred dosage form is wetting powder.

Wetting powder of the present invention is adjuvant used to be comprised:

Dispersant can be one or more in lignosulfonates, polycarboxylate, alkylnaphthalene sulfonate, neopelex, alkyl polyoxyethylene ether sulfonate, alkylphenol-polyethenoxy base ether formaldehyde condensation products, and consumption is 2 ~ 12% of preparation total amount;

Wetting agent can be one or more in lauryl sodium sulfate, Teepol, fatty alcohol-polyoxyethylene ether, polyoxyethylene nonylphenol ether, sorbitan fatty acid ester APEO, and consumption is 1 ~ 10% of preparation total amount;

Appropriate carrier can be one or more in kaolin, diatomite, attapulgite, bentonite, white carbon.

Granule of the present invention is adjuvant used to be comprised:

Dispersant can be one or more in alkylnaphthalene sulfonate, dispersant NNO, lignosulfonates, alkylbenzenesulfonate, alkyl ethyl sulfonate, polycarboxylate, and consumption is 0.5 ~ 15% of preparation total amount;

Adhesive can be one or more in bentonite, hydroxypropyl cellulose, polyacrylamide, polyethylene glycol, polyvinyl alcohol, and consumption is 0.2 ~ 5% of preparation total amount;

Disintegrant can be one or more in calcium chloride, sodium chloride, magnesium chloride, aluminium chloride, and consumption is 0.05 ~ 5% of preparation total amount;

Appropriate carrier can be one or more in ammonium sulfate, urea, potassium dihydrogen phosphate, superphosphate, diatomite, white carbon, precipitated calcium carbonate, talcum powder, attapulgite, potter's clay, kaolin.

Suspending agent of the present invention is adjuvant used to be comprised:

Dispersant can be one or more in polycarboxylate, lignosulfonates, alkylnaphthalene sulfonate, TERSPERSE2425, alkylphenol polyoxyethylene, and consumption is 1 ~ 8% of preparation total amount;

Wetting agent can be one or more in alkylphenol-polyethenoxy base ether formaldehyde condensation products sulphate, alkylphenol-polyethenoxy base ether phosphate, phenethyl phenol polyethenoxy base ether phosphate, alkyl sulfate, naphthalene sulfonate, and consumption is 0.1 ~ 5% of preparation total amount;

Thickener can be one or more in xanthans, carboxymethyl cellulose, Sodium Polyacrylate, bentonite, aluminium-magnesium silicate, and consumption is 0.1 ~ 0.5% of preparation total amount;

Antifreezing agent can be one or more in ethylene glycol, propane diols, glycerine, urea, and consumption is 2 ~ 6% of preparation total amount;

Preservative can be one or more in formaldehyde, sorbic acid, Sodium Benzoate, and consumption is 0.1 ~ 2% of preparation total amount;

Defoamer can be silicone based defoamer, and consumption is 0.1 ~ 0.2% of preparation total amount;

Appropriate amount of deionized water.

Herbicidal composition provided by the invention is mainly used in paddy field management of weeds, and compared with prior art, the present invention possesses following beneficial effect:

1, Herbicidal combinations of the present invention adopts promazine Sulfometuron Methyl with metamifop is composite, two active components are composite in certain ratio range shows fabulous synergistic function, mixed composition comparatively single dose significantly improves herbicidal effect, thus reduce using dosage, while minimizing peasant drug cost, reduce the adverse effect of agricultural chemicals to ecotope.

2, Herbicidal combinations of the present invention expands herbicide spectrum, makes a kind of medicament can prevent and treat multiple weeds simultaneously, provides a kind of means of prevention extremely easily and effectively, all have good preventive effect to paddy field main weeds.

3, Herbicidal combinations of the present invention adopts two kinds of different mechanisms of action to kill weeds, and the different action characteristic of medicament makes to produce extremely strong mutual supplement with each other's advantages between two kinds of active components, effectively can delay generation and the development of single dose resistance.

4, the present composition is to rice safety, can kill rice field main weeds when not injuring paddy rice.

[embodiment]

In order to make object of the present invention, technical scheme and advantage clearly understand, the following specific embodiment of the present invention is described, but is only limitted to this absolutely not.The following stated is the good embodiment of the present invention; only for describing the present invention; can not limitation of the present invention be interpreted as, it should be noted that any amendment done within the spirit and principles in the present invention, equivalent replacement and improve, all should be included within protection scope of the present invention.

Example of formulations 1:50% promazine Mi Huang Long metamifop wetting powder

Take 14.3% promazine Sulfometuron Methyl, 35.7% metamifop, 2% lauryl sodium sulfate, 5% sodium lignin sulfonate, white carbon 10%, kaolin complements to 100%, frequent regulation is for the method for wetting powder, i.e. forward slip value, air-flow crushing, rear mixing, obtains 50% promazine Mi Huang Long metamifop wetting powder.

Example of formulations 2:77% promazine Mi Huang Long metamifop wetting powder

Take 7% promazine Sulfometuron Methyl, 70% metamifop, 3% alkylnaphthalene sulfonate, 4% fatty alcohol-polyoxyethylene ether, kaolin complements to 100%, frequent regulation is for the method for wetting powder, i.e. forward slip value, air-flow crushing, rear mixing, obtains 77% promazine Mi Huang Long metamifop wetting powder.

Example of formulations 3:37% promazine Mi Huang Long metamifop granule

Take 32% promazine Sulfometuron Methyl, 5% metamifop, 12% dispersant NNO, 0.2% carboxylic propyl methocel, 1% starch, 3% calcium chloride, precipitated calcium carbonate complements to 100%, frequent regulation for granule method and forward slip value, air-flow crushing, rear mixing, add water kneading, granulation, screening, obtains described 37% promazine Mi Huang Long metamifop granule.

Example of formulations 4:28% promazine Mi Huang Long metamifop granule

Take 8% promazine Sulfometuron Methyl, 20% metamifop, 10% alkylbenzenesulfonate, 2% bentonite, 5% sodium chloride, 8% superphosphate, white carbon 5%, diatomite complements to 100%, frequent regulation for granule method and forward slip value, air-flow crushing, rear mixing, add water kneading, granulation, screening, obtains described 28% promazine Mi Huang Long metamifop granule.

Example of formulations 5:42% promazine Mi Huang Long metamifop suspending agent

Take 7% promazine Sulfometuron Methyl, 35% metamifop, 2%TERSPERSE2425,12% phenethyl phenol polyethenoxy base ether phosphate, 0.2% xanthans, 4% glycerine, 0.5% Sodium Benzoate, 0.1% silicone based defoamer, deionized water complement to 100%, frequent regulation is for the method for suspending agent, i.e. high speed shear dispersion, sand milling are pulverized, are in harmonious proportion, and obtain 42% promazine Mi Huang Long metamifop suspending agent.

Example of formulations 6:13% promazine Mi Huang Long metamifop suspending agent

Take 8% promazine Sulfometuron Methyl, 5% metamifop, 3% lignosulfonates, 10% alkylphenol-polyethenoxy base ether phosphate, 0.1% Sodium Polyacrylate, 5% propane diols, 1% sorbic acid, 0.1% silicone based defoamer, deionized water complement to 100%, frequent regulation is for the method for suspending agent, i.e. high speed shear dispersion, sand milling are pulverized, are in harmonious proportion, and obtain 13% promazine Mi Huang Long metamifop suspending agent.

Raw survey embodiment 1:

Promazine Sulfometuron Methyl is with metamifop cauline leaf process synergy toxicity determination test

In order to prevent and treat the paddy field weed in agricultural production, inventors have investigated promazine Sulfometuron Methyl with the herbicidal effect of metamifop binary built, and the synergy type after using with Sun Yun abundant both method evaluations different proportion, for the rational mixture of promazine Sulfometuron Methyl and metamifop provides scientific basis.Experiment is with reference to " farm-chemical indoor determination experiment criterion weed killer herbicide the 9th part ".

1, experimental condition

1.1 for examination weeds

Moleplant seed, lady's-grass, false loosestrife, cyperus iria

1.2 reagent agent

Promazine Sulfometuron Methyl

Metamifop

2, try material to prepare

Cultivation for examination weeds adopts potted plant cultivation.By 11 × 12cm plastic basin, by air-dry for the soil not using the farmland of weed killer herbicide to adopt to return, sieve after fill basin, quantitative 4/5 place of dry ground in basin, P in soil H value 7.2, the content of organic matter 1.1%.Top pouring mode is adopted to make soil completely moistening.Then by the seed uniform broadcasting through the pretreated moleplant seed of vernalization, lady's-grass, false loosestrife, cyperus iria in soil surface, 30-40 grain broadcast by every basin, earthing 1-2mm, is placed in cellar culture in greenhouse.In incubation with top irrigation method moisturizing to saturation state, after weeds emerge, every basin is decided to be 20 strains.

3, experimental scheme

46 process are established in this test altogether, wherein promazine Sulfometuron Methyl establish 52.5,60,67.5,82.5,135g a.i./hm ²5 dosage process ， metamifop establish 120,150,180,210,300g a.i./hm ²5 dosage process.Promazine Sulfometuron Methyl is mixed with both metamifop establishes 7 assembly than process: 1:160,1:40,1:10,2:5,8:5,32:5,128:5, dosage is 52.5,60,67.5,82.5,135g a.i./hm ², separately establish 1 clear water contrast, amount to 46 process, repeat 4 times.

4, application method

The dispenser time limit carries out cauline leaf spraying process when fixing on weeds 2 ~ 4 leaf phase, be placed in spray medicine (ASS-4 type pesticide spraying system, DG8003 shower nozzle, atomisation pressure 2.75MPA in tower, spouting liquid 30Kg/ mu), treat that natural air drying is placed in greenhouse to cultivate and observe.

5, data survey and statistical analysis

Record the damage symptoms of weeds after dispenser in detail, process latter 45 days, carry out fresh weight measurement, and compared with control treatment, calculate weeds fresh weight preventive effect.By the linear regression analysis between the probability value of preventive effect and the logarithm value of series concentration, calculate ED50 and the correlation coefficient of each process, evaluate the biologically active of each process to weeds, the abundant method of Sun Yun is used to calculate the co-toxicity coefficient of different agents proportioning, evaluate the synergy situation of different ratio, determine promazine Sulfometuron Methyl Yu the optimum activity of metamifop ratio.

The abundant method computing formula of Sun Yun:

$E=\frac{C-T}{C}\×100................................................\left(1\right)$

In formula: E---fresh weight preventive effect;

C---contrast weeds acrial part weeds fresh weight;

T---process weeds acrial part weeds fresh weight.

$\mathrm{ATI}=\frac{S}{M}\×100.......................................\left(2\right)$

In formula: ATI---mixture actual measurement toxicity index;

The ED of S---standard herbicide ₅₀, unit is a gram per hectare (g a.i./hm ²);

The ED of M---mixture ₅₀, unit is a gram per hectare (g a.i./hm ²).

TTI＝TI _A×P _A+TI _B×P _B……………………………………………(3)

In formula: TTI---the theoretical toxicity index of mixture;

TI _a---A medicament toxicity index;

P _a---the percentage composition of A medicament in mixture, unit is percentage (%);

TI _b---B medicament toxicity index;

P _b---the percentage composition of B medicament in mixture, unit is percentage (%);

$\mathrm{CTC}=\frac{\mathrm{ATI}}{\mathrm{TTI}}\×100.................................\left(4\right)$

In formula: CTC---co-toxicity coefficient;

ATI---mixture actual measurement toxicity index;

The theoretical toxicity index of TTI---mixture.

Co-toxicity coefficient CTC >=120 of built agent show as synergistic effect; CTC≤80 show as antagonism; 80 < CTC < 120 show as summation action.

6, results and analysis is in table 1 ~ 4

Table 1 promazine Sulfometuron Methyl is with metamifop mixture water prevention weeds in paddy field moleplant seed virulence

Table 2 promazine Sulfometuron Methyl is with metamifop mixture water prevention weeds in paddy field lady's-grass virulence

Table 3 promazine Sulfometuron Methyl is with metamifop mixture water prevention weeds in paddy field false loosestrife virulence

Table 4 promazine Sulfometuron Methyl is with metamifop mixture water prevention weeds in paddy field cyperus iria virulence

Toxicity Determination result shows, promazine Sulfometuron Methyl He metamifop are mixed in the scope of weight ratio 1:160 ~ 128:5 shows as addition or synergistic effect to weeds, mixed in the scope of weight ratio 1:40 ~ 32:5 have good synergistic effect, mixed in the scope of weight ratio 1:10 ~ 8:5 have obvious synergistic effect, expand control of weeds spectrum, reach the object of simultaneously preventing and kill off grass family, broad-leaved and sedge weed.

Raw survey embodiment 2:

Promazine Sulfometuron Methyl is with the composite cauline leaf process of metamifop is tested the Security test of paddy rice

In order to study promazine Sulfometuron Methyl with the composite cauline leaf process of metamifop is to the safety of paddy rice, for promazine Sulfometuron Methyl with the rational mixture of metamifop provides scientific basis, inventor has done following test, test tests criterion-weed killer herbicide with reference to People's Republic of China (PRC) agricultural industry criteria NY/T 1155.8-2007 farm-chemical indoor determination, the 8th part: the safety testing cauline leaf spray-on process of crop.

1, experimental condition

1.1 for studying thing

Paddy rice

1.2 for examination weeds

Barnyard grass

1.3 reagent agent

Promazine Sulfometuron Methyl

Metamifop

2, try material to prepare

2.1 for studying thing

Adopt greenhouse pot culture method for the cultivation studying thing, by 11 × 12cm plastic basin, put in shallow-water tank, by air-dry for the soil adopted back in the farmland not using weed killer herbicide, after sieving, fill basin, quantitative 4/5 place of dry ground in basin, P in soil H value 7.2, the content of organic matter 1.1%.After adopting top pouring mode to make soil completely moistening, rice paddy seed is quantitatively broadcasted sowing in soil surface, earthing 1.0cm, indoor temperature 28 ~ 32 DEG C/18 ~ 25 DEG C (d/n), relative moisture 75% ± 15%.In incubation with top irrigation method moisturizing to saturation state.After rice seedling, every basin is decided to be 10 strains.

2.2 for examination weeds

Cultivation for examination weeds adopts greenhouse pot culture method, and by 11 × 12cm plastic basin, put in shallow-water tank, by not using, the soil adopted back in the farmland of weed killer herbicide was air-dry, filled basin after sieving, quantitative 4/5 place of dry ground in basin, P in soil H value 7.2, the content of organic matter 1.1%.After bottom employing basin alms bowl, infiltrating irrigation mode makes soil completely moistening, quantitatively broadcast sowing pretreated in soil surface for examination weed seed, earthing 2mm, indoor temperature 28 ~ 32 DEG C/18 ~ 25 DEG C (d/n), relative moisture 75% ± 15%.With top irrigation method moisturizing to saturation state, after barnyard grass is emerged, every basin is decided to be 10 strains.

3, experimental scheme

3.1 weeds dispenser dosage

36 process are established in test altogether, wherein promazine Sulfometuron Methyl establish 20,30,40,50,60g a.i./hm ²5 dosage process ， metamifop establish 40,60,80,100,120g a.i./hm ²5 dosage process.Promazine Sulfometuron Methyl is mixed with both metamifop establishes 5 assembly than process: 1:40,1:10,2:5,8:5,32:5, dosage is 20,30,40,50,60g a.i./hm ², separately establish 1 clear water contrast, amount to 36 process, repeat 4 times.

3.2 crop dispenser dosage

36 process are established in test altogether, wherein promazine Sulfometuron Methyl establish 60,90,120,150,180g a.i./hm ²5 dosage process ， metamifop establish 180,270,360,450,540g a.i./hm ²5 dosage process.Promazine Sulfometuron Methyl is mixed with both metamifop establishes 5 assembly than process: 1:40,1:10,2:5,8:5,32:5, dosage is 180,270,360,450,540g a.i./hm ², separately establish 1 clear water contrast, amount to 36 process, repeat 4 times.

4, application method

The dispenser time limit carries out cauline leaf spraying process when fixing on paddy rice 2 leaf 1 heart stage, weeds 2 ~ 4 leaf phase, be placed in spray medicine (ASS-4 type pesticide spraying system, DG8003 shower nozzle, atomisation pressure 2.75MPA in tower, spouting liquid 30Kg/ mu), treat that natural air drying is placed in greenhouse to cultivate and observe.

5, data survey and statistical analysis

5.1 crop investigation

After dispenser, investigate each process paddy rice with or without symptom of chemical damage, if having, record symptom of chemical damage in detail, within after medicine 45 days, weigh each process paddy rice fresh weight, calculate fresh weight inhibition, with the safety of clear and definite test medicine to paddy rice.

5.2 weedy rices

The damage symptoms (as growth inhibition, chlorosis, deformity etc.) of detailed record weeds after dispenser, after medicine 45 days, weighs each process weeds acrial part fresh weight, the fresh weight preventive effect of employing growth inhibition assay calculating weeds.

5.3 growth inhibition assay computing formula

$E=\frac{T_0-T_1}{T_0}\&times;100...............................\left(5\right)$

In formula:

E-fresh weight preventive effect, unit is percentage (%);

T ₀-contrast weeds acrial part fresh weight, unit is gram;

T ₁-process weeds acrial part fresh weight, unit is gram.

5.4 selectivity index computational methods

6, results and analysis is in table 5 ~ 7

Table 5 promazine Sulfometuron Methyl mixtures' ratio different from metamifop is to the preventive effect of barnyard grass

Table 6 promazine Sulfometuron Methyl mixtures' ratio different from metamifop is to the safety of paddy rice

Table 7 promazine Sulfometuron Methyl mixtures' ratio different from metamifop is to the selectivity index of paddy rice

Note: in table 7 data be by market demand DPS2000 data handling system in table 5, table 6 (Tang Qiyi, Feng Mingguang. Practical Statistic analysis and DPS data handling system [M] thereof. Beijing: Science Press, 2002.188-201) calculate.

When selectivity index >=4, represent that the selectivity of medicament between crops and weeds is very high, as 2≤selectivity index < 4, represent that medicament has selectivity between crops and weeds, as selectivity index < 2, represent the poor selectivity of medicament between crops and weeds.Show the Security test test of paddy rice, promazine Sulfometuron Methyl and metamifop are mixed in the scope of weight ratio 1:40 ~ 32:5 is greater than 2, to rice safety to rice selective index.

Raw survey embodiment 3

Prevent and kill off paddy field weed field control effectiveness test I:

1, test process

(1) 50% promazine Mi Huang Long metamifop wetting powder (1:40) 28g/ mu

(2) 50% promazine Mi Huang Long metamifop wetting powder (1:10) 28g/ mus

(3) 50% promazine Mi Huang Long metamifop wetting powder (2:5) 28g/ mus

(4) 50% promazine Mi Huang Long metamifop wetting powder (8:5) 28g/ mus

(5) 50% promazine Mi Huang Long metamifop wetting powder (32:5) 28g/ mus

(6) 9.5% promazine Sulfometuron Methyl suspending agent 147g/ mus

(7) 10% metamifop wetting powder 140g/ mus

(8) blank

7 process are established in test, repeat for 4 times, totally 28 process communities, and often process plot area 20 square metres, random district group arranges.(1) ~ (5) 50% promazine Mi Huang Long metamifop wetting powder is reagent agent, and 9.5% promazine Sulfometuron Methyl suspending agent and 10% metamifop wetting powder are contrast medicament.Every mu is watered 30 kilograms, adopts 552 third type sprayers (0.7mm aperture) even spraying.Field main weeds has moleplant seed, lady's-grass, eleusine indica, Monochoria vaginalis, false loosestrife, cyperus iria etc.

2, pilot project and method

(1) safety: after dispenser, the situation of growing of investigation paddy rice, evaluates reagent agent to the safety of paddy rice.

(2) herbicidal effect: every community gets 4 points at random, investigates 1/4 square metre at often, and after dispenser, 45 days investigation weed control efficacies, record weeds kind and strain number respectively, calculate weeds strain preventive effect.

3, result of the test

(1) safety: dispenser " Invest, Then Investigate ", chemicals treatment district Plant Height of Rice, Ye Se and blank district are basically identical, show that the grand metamifop wetting powder of the phonetic sulphur of reagent agent (1) ~ (5) 50% promazine is all to rice safety.

(2) herbicidal effect: in table 8

45 days various weed control efficacies after table 8 medicine

Note: (1) 50% promazine Mi Huang Long metamifop wetting powder (1:40)

(2) 50% promazine Mi Huang Long metamifop wetting powder (1:10)

(3) 50% promazine Mi Huang Long metamifop wetting powder (2:5)

(4) 50% promazine Mi Huang Long metamifop wetting powder (8:5)

(5) 50% promazine Mi Huang Long metamifop wetting powder (32:5)

(6) 9.5% promazine Sulfometuron Methyl suspending agents

(7) 10% metamifop wetting powders

(8) blank

As shown in Table 8,50% promazine Mi Huang Long metamifop wetting powder of different ratio between 75.54% ~ 96.59%, is all better than contrast medicament 9.5% promazine Sulfometuron Methyl suspending agent and 10% metamifop wetting powder (weeds strain preventive effect is respectively 54.25% and 53.67%) to common weed strain preventive effect.Wherein promazine Sulfometuron Methyl is with metamifop all has obvious preventive effect when weight ratio is 1:40 ~ 32:5 to paddy field common weed, and weeds strain preventive effect is all more than 75%; Promazine Sulfometuron Methyl is with metamifop is better to paddy field common weed preventive effect when weight ratio is 1:10 ~ 8:5, and weeds strain preventive effect is all more than 90%; And promazine Sulfometuron Methyl He when metamifop weight ratio is 2:5 preventive effect especially up to 96.59%.Illustrate thus, promazine Sulfometuron Methyl is with when the weight ratio of metamifop is within the scope of 1:40 ~ 32:5, and grass family, broad-leaved and the sedge weed common to paddy field have preventive effect, and this herbicidal composition is to rice safety.

Prevent and kill off paddy field weed field control effectiveness test II:

1, test process

(1) 10% promazine Mi Huang Long metamifop wetting powder (2:5) 140g/ mu

(2) 50% promazine Mi Huang Long metamifop wetting powder (2:5) 28g/ mus

(3) 70% promazine Mi Huang Long metamifop wetting powder (2:5) 20g/ mus

3 process are established in test, repeat for 4 times, totally 12 process communities, and often process plot area 20 square metres, random district group arranges.(1) ~ (3) promazine Mi Huang Long metamifop wetting powder is reagent agent, and every mu is watered 30 kilograms, adopts 552 third type sprayers (0.7mm aperture) even spraying.Field main weeds has moleplant seed, lady's-grass, eleusine indica, Monochoria vaginalis, false loosestrife, cyperus iria etc.

2, pilot project and method

Herbicidal effect: every community gets 4 points at random, investigates 1/4 square metre at often, and after dispenser, 45 days investigation weed control efficacies, record weeds kind and strain number respectively, calculate weeds strain preventive effect.

3, result of the test: herbicidal effect is in table 9

45 days various weed control efficacies after table 9 medicine

Note: (1) 10% promazine Mi Huang Long metamifop wetting powder (2:5)

(2) 50% promazine Mi Huang Long metamifop wetting powder (2:5)

(3) 70% promazine Mi Huang Long metamifop wetting powder (2:5)

As shown in Table 9, when promazine Sulfometuron Methyl with when the weight ratio of metamifop is 2:5, the promazine Mi Huang Long metamifop wetting powder of different content to common weed strain preventive effect all more than 95%, show promazine Sulfometuron Methyl with when metamifop weight ratio is optimal proportion, the herbicidal composition of different activities component content all has significant preventive effect to weeds.

In sum, instant component is reasonable, preventive effect is better than activity when each component is used separately, good preventive effect is all had to grassy weed, broad leaved weed and sedge weed, expand control of weeds spectrum, delay the generation of herbicide resistance, to crop safety, meet the security requirement of pesticidal preparations.

Claims (6)

1. a herbicidal composition, it is characterized in that said composition is made up of a and b two kinds of active components, wherein active component a is promazine Sulfometuron Methyl, and active component b Wei metamifop, two active component weight ratios are: a promazine Sulfometuron Methyl: b metamifop=1:40-32:5.

2. herbicidal composition according to claim 1, is characterized in that active component weight ratio is: a promazine Sulfometuron Methyl: b metamifop=1:10-8:5.

3. herbicidal composition according to claim 2, is characterized in that active component weight ratio is: a promazine Sulfometuron Methyl: b metamifop=2:5.

4. the herbicidal composition according to any one of claim 1-3, is characterized in that the percentage composition of active component in herbicidal composition is 1-80%.

5. herbicidal composition according to claim 1, is characterized in that said composition can be any one formulation agriculturally allowed.

6. herbicidal composition according to claim 1, is characterized in that for preventing and kill off paddy field weed.