CN103858914A - Herbicide composition for wheatland - Google Patents
Herbicide composition for wheatland Download PDFInfo
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- CN103858914A CN103858914A CN201410069935.5A CN201410069935A CN103858914A CN 103858914 A CN103858914 A CN 103858914A CN 201410069935 A CN201410069935 A CN 201410069935A CN 103858914 A CN103858914 A CN 103858914A
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Abstract
The invention relates to an herbicide composition for a wheatland, and particularly relates to an herbicide composition for a wheatland, which contains two active ingredients, namely fenoxaprop-p-ethyl and halosulfuron-methyl, wherein the weight ratio of the fenoxaprop-p-ethyl to the halosulfuron-methyl is (1:8) to (32:1), and the active ingredients account for 10-80% of the compound herbicide by weight percentage. According to the herbicide composition, after the two active ingredients, namely the fenoxaprop-p-ethyl and the halosulfuron-methyl, are compounded, the preventing effect on weeds is improved by utilizing the complementarity of the two active ingredients, the shortcoming caused by that when two kinds of herbicides are independently used is overcome, and both grassy weeds and broadleaf weeds in the wheatland can be prevented and removed, so that an obvious synergy effect is achieved. The herbicide composition has an obvious herbicide effect, is safe to wheat, and has no influence on afterreap crops, so that the herbicide composition is an ideal herbicide.
Description
[technical field]
The present invention relates to a kind of agrochemical composition, is exactly the herbicidal composition of the composite control weeds of wheat of You fenoxaprop and halosulfuronmethyl.
[background technology]
Wheat is to be a kind ofly rich in starch, protein, fat, mineral matter, calcium, iron and vitamin A etc. the extensive gramineous plants of plantation all over the world, is the cereal crops of gross yield second in the world, one of cereal crops that Ye Shi China is important.But, in the process of growth of wheat, exist a lot of factors that affect output, wherein weeds harm is exactly an importance, wheat weeds can simply be divided into broad leaved weed and grassy weed according to form, and wherein broad leaved weed mainly contains and broadcasts ma wormwood artemisia, shepherd's purse, clearvers, lamb's-quarters, field thistle, dayflower, ivy glorybind etc.; Grassy weed mainly contains wild oat, amur foxtail, hard grass, bromegrass, Triticum tauschii etc.The main harm of weeds is and wheat contention moisture, nutriment, illumination and space etc., is also the vector of Wheat Diseases And Insect Pests simultaneously, directly affects the yield and quality of wheat.Often need to use every year a large amount of weed killer herbicides carries out weed control to retrieve the production loss of wheat for this reason.But weed killer herbicide improper use or operation technique are not in place tends to cause weeds to produce increasing resistance to it, control efficiency is undesirable or produce the phenomenon such as poisoning.Therefore, reasonable selection wheat paddock weed killer herbicide has become the important technical links of guaranteeing wheat safety in production.
Fenoxaprop belongs to aryloxyphenoxypropanoates class selectivity inner-adsorption conduction-type herbicide, is acetyl-CoA carboxylase (ACCase) inhibitor.After dispenser active ingredient by weeds cauline leaf Assimilation and conductivity the growing point to phyllopodium, internode meristematic tissue, root, suppress the biosynthesis of fatty acid, effect rapidly, in 2～3 days, weeds stop growing, 5～7 days lobus cardiacus chlorosis purplings, meristematic tissue browning look, blade is withered gradually.Can be used for the grassy weeds such as Control Wild oat, amur foxtail, hard grass, Alopecurus, barnyard grass, green foxtail, but invalid to broad leaved weed.Therefore, the harm of all weeds in the uncontrollable field of Shi Yong fenoxaprop separately.
Halosulfuronmethyl belongs to sulfonylurea herbicide, is acetolactate synthestase (ALS) inhibitor, absorbs by root and the leaf of weeds, Bidirectional Conduction in plant corpus, hinder the biosynthesis of branched-chain amino acid, suppress cell division, thereby cause the normal growth of weeds to be damaged and death.Because it is harmless object doing rapid metabolism in object, therefore to crop safety, all can use after Miao Qianmiao.Broad-leaved and the sedge weeds such as halosulfuronmethyl can be used for the various crop such as wheat, corn, paddy rice and non-crop field is prevented and kill off piemarker, Siberian cocklebur, datura, artemisiifolia, Amaranthus retroflexus, knotweed, kitchen garden, Cassia occidentalis, led a cow, the rhizome of nutgrass flatsedge, but invalid to grassy weed.Therefore, the independent use of halosulfuronmethyl can not meet the needs of wheatland management of weeds.
Find domestic have the respectively patent relevant to fenoxaprop and halosulfuronmethyl or document record by literature search, for example Chinese patent CN101700023A discloses fenoxaprop and clodinafop-propargyl is composite for wheat paddock management of weeds, and it is invalid to broad leaved weed that this composition only works to grassy weed.CN103210946A discloses halosulfuronmethyl and the composite Herbicidal combinations of flucarbazone, and the two component mechanisms of action are identical, adopts cognate interaction mechanism to kill weeds, has accelerated the generation speed of herbicide resistance.The inventor is by a large amount of desk research and field trial, unexpected discovery fenoxaprop and halosulfuronmethyl are composite, there is unforeseeable synergistic function, make up the defect that above each single dose and complex preparation exist in actual applications, expanded herbicide spectrum, a dispenser can be prevented and kill off the various weeds in wheat paddock, has reduced spraying times, reduce cost accounting, to wheat and succession crop safety.And current fenoxaprop and the composite relevant report of halosulfuronmethyl not yet found.
[summary of the invention]
The object of the invention is to seek a kind of novel wheat field herbicide composition, to make up the deficiency of wheatland Common Herbicides, for wheatland provides a kind of available weed killer herbicide conscientiously.Said composition both had advantages of active high, consumption is few, cost is low, has again that broad weed-killing spectrum, safety are good, the obvious feature of synergistic effect.
Realizing technical scheme of the present invention is: the herbicidal composition of a kind of Han fenoxaprop and halosulfuronmethyl.Other titles of described fenoxaprop (Fenoxaprop-P-ethyl): galloping horse, prestige despot, chemical name: (R)-2-[4-(6-Lv benzoxazole-2-base oxygen base) phenoxy group] ethyl propionate, structural formula is:
Described halosulfuronmethyl (Halosulfuron-methyl) chemical name is: 3-chloro-5 (4,6-dimethoxypyridin-2-base amino carbonyl amino sulfonyl)-1-methylpyrazole-4-carboxylate methyl ester, and structural formula is:
In described herbicidal composition, the weight ratio of active component fenoxaprop and halosulfuronmethyl is 1:8～32:1, is preferably 1:2～8:1, more preferably 2:1.This herbicidal composition contributes to active ingredient known substance stable and drug effect performance in preparation to form by 10～80% active component and carrier, wetting agent, dispersant etc. and other.
Need or applying environment according to different uses, herbicidal composition of the present invention can be by conventional at present pesticide producing mode, be prepared into the upper any formulation allowing of agricultural, can be prepared into wetting powder, water dispersible granules etc. as preferred herbicidal composition of the present invention, most preferred dosage form is wetting powder.
Wetting powder (WP) is by pesticide original medicine and a certain amount of auxiliary agent, reaches in proportion the powder dose-type of certain fineness after abundant co-grinding.Adjuvant used wetting agent, dispersant and the carrier etc. of comprising of wetting powder of the present invention.Wherein, wetting agent can be one or more in Negel, lauryl sodium sulfate, Teepol, fatty alcohol-polyoxyethylene ether, polyoxyethylene nonylphenol ether, sorbitan fatty acid ester APEO etc.; Described dispersant can be one or more in lignosulfonates, calcium lignosulfonate, ethoxylated dodecyl alcohol sodium sulphate, neopelex, alkyl polyoxyethylene ether sulfonate, alkylphenol-polyethenoxy base ether formaldehyde condensation products etc.; Described carrier can be one or more in kaolin, diatomite, attapulgite, bentonite, white carbon etc.
Water dispersible granules (WDG) by wetting powder or suspending agent again granulation obtain.Adjuvant used dispersant, wetting agent, disintegrant, adhesive, the carrier etc. of comprising of water dispersible granules of the present invention.Wherein, dispersant can be one or more in polycarboxylate, lignosulfonates, alkylnaphthalene sulfonate, alkylphenol polyoxyethylene, sodium lignin sulfonate, alkyl polyoxyethylene ether sulfonate etc.; Wetting agent can be one or more in naphthalene sulfonate, lauryl sodium sulfate, sorbitan fatty acid ester polyoxyethylene ether, alkylsulfonate etc.; Disintegrant can be one or more in starch and derivative sodium carboxymethyl starch, low-substituted hydroxypropyl cellulose, crospolyvinylpyrrolidone, alginic acid and its esters etc.; Adhesive can be one or more in lignosulfonates, alkylbenzenesulfonate, alkylnaphthalene sulfonate formaldehyde condensation products, polycarboxylic acid and water-soluble high-molecular compound sodium carboxymethylcellulose, polyvinyl alcohol etc.; Carrier can be one or more in white carbon, kaolin, bentonite, precipitated calcium carbonate, gypsum, attapulgite, urea, sucrose etc.
Herbicidal composition of the present invention is mainly used in and in wheat paddock, prevents and kill off grass family and broad leaved weed, the weeds such as common amur foxtail, wild oat, hard Cao, Wang grass, bromegrass, clearvers, lamb's-quarters, Amaranthus retroflexus, kitchen garden are had to splendid control efficiency, but be not limited to above-mentioned weeds.
The beneficial effect that herbicidal composition of the present invention possesses: (1) herbicidal composition of the present invention has synergistic function; (2) herbicidal composition two active components of the present invention are had complementary advantages, fool proof to wheat, have reduced the consumption of active ingredient simultaneously, minimum to environmental influence; (3) herbicidal composition broad weed-killing spectrum of the present invention, can disposablely prevent and kill off the various weeds of wheatland; (4) the herbicidal composition optimum period for applying fertilizer of the present invention extends, and herbicide is thorough; (5) herbicidal composition of the present invention can be avoided, delays and control weeds and develops immunity to drugs, thereby delays the succession speed of weed community.
[embodiment]
Product of the present invention and application are described by following specific embodiment, but should not be construed as limitation of the present invention.Without departing from the spirit and substance of the case in the present invention, the modification of method of the present invention, step or condition etc. being made or replacement all belong to scope of the present invention.
FORMULATION EXAMPLE 1:60% fenoxaprop halosulfuronmethyl wetting powder
Qu fenoxaprop 40%, halosulfuronmethyl 20%, fatty alcohol-polyoxyethylene ether 2%, neopelex 8%, kaolin complement to 100%, pulverize and process to obtain 60% fenoxaprop halosulfuronmethyl wetting powder through mixed airflow.
FORMULATION EXAMPLE 2:45% fenoxaprop halosulfuronmethyl wetting powder
Qu fenoxaprop 40%, halosulfuronmethyl 5%, polyoxyethylene nonylphenol ether 3%, sodium lignin sulfonate 5%, white carbon complement to 100%, pulverize and process to obtain 45% fenoxaprop halosulfuronmethyl wetting powder through mixed airflow.
FORMULATION EXAMPLE 3:20% fenoxaprop halosulfuronmethyl wetting powder
Qu fenoxaprop 10%, halosulfuronmethyl 10%, lauryl sodium sulfate 2%, alkyl polyoxyethylene ether sulfonate 12%, diatomite complement to 100%, pulverize and process to obtain 20% fenoxaprop halosulfuronmethyl wetting powder through mixed airflow.
FORMULATION EXAMPLE 4:75% fenoxaprop halosulfuronmethyl water dispersible granules
Qu fenoxaprop 25%, halosulfuronmethyl 50%, lauryl sodium sulfate 2%, sorbitan fatty acid ester polyoxyethylene ether 6%, low-substituted hydroxypropyl cellulose 1%, alkylnaphthalene sulfonate formaldehyde condensation products 1%, bentonite complement to 100%, after mixing, through ultra micro air-flow crushing, mediate granulation and obtain 75% fenoxaprop halosulfuronmethyl water dispersible granules.
FORMULATION EXAMPLE 5:33% fenoxaprop halosulfuronmethyl water dispersible granules
Qu fenoxaprop 32%, halosulfuronmethyl 1%, alkylnaphthalene sulfonate 3%, sodium lignin sulfonate 8%, alginic acid 3%, sodium carboxymethylcellulose 0.5%, precipitated calcium carbonate complement to 100%, after mixing, through ultra micro air-flow crushing, mediate granulation and obtain 33% fenoxaprop halosulfuronmethyl water dispersible granules.
FORMULATION EXAMPLE 6:54% fenoxaprop halosulfuronmethyl water dispersible granules
Qu fenoxaprop 6%, halosulfuronmethyl 48%, alkylphenol polyoxyethylene 5%, naphthalene sulfonate 5%, crospolyvinylpyrrolidone 1%, polyvinyl alcohol 0.1%, attapulgite complement to 100%, after mixing, through ultra micro air-flow crushing, mediate granulation and obtain 54% fenoxaprop halosulfuronmethyl water dispersible granules.
The raw embodiment 1 that surveys
Fenoxaprop and halosulfuronmethyl cauline leaf are processed synergy toxicity determination test
In order to prevent and treat wheat paddock broad leaved weed and the grassy weed in agricultural production, two kinds of compositions of inventor Yong fenoxaprop and halosulfuronmethyl have carried out indoor virulence testing research, concrete grammar is: indoor pot method is carried out cauline leaf processing, and experiment is with reference to " farm-chemical indoor determination experiment criterion weed killer herbicide Part IV ".
1, reagent agent
Fenoxaprop
Halosulfuronmethyl
2, for examination weeds
Clearvers, lamb's-quarters, amur foxtail, wild oat
Cultivation for examination weeds adopts potted plant cultivation.By 11 × 12cm plastic basin, by air-dry the soil that did not use the wheat paddock of weed killer herbicide to adopt back, fill basin after sieving, quantitative 4/5 place of dry ground in basin, P in soil H value 7.0, the content of organic matter 1.2%.Adopt basin alms bowl bottom infiltrating irrigation mode to make soil completely moistening.Amur foxtail, wild oat, lamb's-quarters, clearvers seed that last year, field gathered are soaked to 24h with gibberellin, clear water clean after with dark gauze shading, is placed in the culture dish that is covered with gauze, water is moistening carries out vernalization, sows after waiting seed to show money or valuables one carries unintentionally.Each approximately 50 the even program requests of amur foxtail and wild oat are at soil surface, earthing 0.5～1.0cm, and the every basin of clearvers and lamb's-quarters is broadcast 30～40, and earthing 1～2mm is placed in cellar culture in greenhouse, in cultivation process, keeps ground moistening with the moisturizing of basin alms bowl bottom infiltrating irrigation mode.After weeds emerge, amur foxtail and the every basin of wild oat are decided to be to 20 strains, the every basin of lamb's-quarters and clearvers is decided to be 10 strains.
3, test is processed
46 processing are established in this test altogether, wherein fenoxaprop establish 15,30,45,60,75g a.i./hm
25 dosage processing, halosulfuronmethyl establishes 6,12,18,24,30g a.i./hm
25 dosage processing.The two mixedly establishes 7 assembly than processing fenoxaprop and halosulfuronmethyl: 1:32,1:8,1:2,2:1,8:1,32:1,128:1, dosage is respectively 15,30,45,60,75g a.i./hm
2, separately establish 1 clear water contrast, amount to 46 processing, repeat for 4 times.
4, test method
The dispenser time limit fixes on when weeds grew to for 3～4 leaf phase carries out cauline leaf spraying processing, is placed in spray medicine (ASS-4 type pesticide spraying system, DG8003 shower nozzle, atomisation pressure 2.75MPA, spouting liquid 30Kg/ mu) in tower, treats that natural air drying is placed on cultivation in greenhouse and observes.
5, data survey and statistical analysis
After processing, observe and record the growth conditions of weeds, process after 30 days, investigation weed control efficacy, records respectively the strain number of weeds, calculates weeds strain preventive effect.By the linear regression analysis between probability value and the logarithm value of series concentration of preventive effect, calculate the ED of each processing
50and correlation coefficient, evaluate the biologically active of each processing to weeds, the abundant method of utilization Sun Yun calculates the co-toxicity coefficient of different medicament proportionings, evaluates the synergy situation of different proportionings, determines fenoxaprop and halosulfuronmethyl optimum activity ratio.
The abundant method computing formula of Sun Yun:
In formula: E---strain preventive effect;
C---contrast weeds acrial part weeds strain number;
T---process weeds acrial part weeds strain number.
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 (%).
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, result of the test: in Table 1-4
Table 1 fenoxaprop and halosulfuronmethyl mixture control weeds of wheat clearvers virulence
Table 2 fenoxaprop and halosulfuronmethyl mixture control weeds of wheat lamb's-quarters virulence
Table 3 fenoxaprop and halosulfuronmethyl mixture control weeds of wheat amur foxtail virulence
Table 4 fenoxaprop and halosulfuronmethyl mixture control weeds of wheat wild oat virulence
Toxicity Determination result shows that: fenoxaprop and halosulfuronmethyl are mixed in the scope of weight ratio 1:32～128:1 weeds is shown as and are added or synergistic effect, in the scope of weight ratio 1:8～32:1, use with and have good synergistic effect, mixed in the scope of weight ratio 1:2～8:1 have obvious synergistic effect, expanded control of weeds spectrum.
The raw embodiment 2 that surveys
The composite cauline leaf of fenoxaprop and halosulfuronmethyl is processed the Security test test to wheat
In order to study, the composite cauline leaf of fenoxaprop and halosulfuronmethyl is processed safety Wei fenoxaprop to wheat and the rational mixture of halosulfuronmethyl provides scientific basis, inventor has done following test, test is with reference to the agricultural industry criteria NY/T1155.8-2007 of People's Republic of China (PRC) farm-chemical indoor determination experiment criterion-weed killer herbicide, the 8th part: the safety testing cauline leaf spray-on process of crop.
1, experimental condition
(1) for studying thing
Wheat breed: No. 20, Jimai
(2) for examination weeds
Amur foxtail
(3) reagent agent
Fenoxaprop
Halosulfuronmethyl
2, examination material is prepared
(1) for studying thing
Adopt greenhouse pot culture method for the cultivation that studies thing, by 11 × 12cm plastic basin, put in culturing pot, by not using, the soil of adopting back in the wheat paddock of weed killer herbicide was air-dry, after sieving, filled basin, quantitative 4/5 place of dry ground in basin, P in soil H value 7.0, the content of organic matter 1.2%.After adopting basin alms bowl bottom infiltrating irrigation mode to make soil completely moistening, wheat seed is quantitatively broadcasted sowing in soil surface, earthing 0.5～1.0cm, with the moisturizing of basin alms bowl bottom infiltrating irrigation mode, keeps soil fully moistening.
(2) for examination weeds
Cultivation for examination weeds adopts greenhouse pot culture method, by 11 × 12cm plastic basin, puts in culturing pot, and by not using, the soil of adopting back in the wheat paddock of weed killer herbicide was air-dry, after sieving, filled basin, quantitative 4/5 place of dry ground in basin, P in soil H value 7.0, the content of organic matter 1.2%.After adopting basin alms bowl bottom infiltrating irrigation mode to make soil completely moistening, quantitatively broadcast sowing in soil surface for examination weed seed pretreated, earthing 0.5～1.0cm, with the moisturizing of basin alms bowl bottom infiltrating irrigation mode, keep soil fully moistening, amur foxtail is decided to be to 20 strains after weeds emerge.
3, experimental scheme
(1) weeds dispenser dosage
36 processing are established in test altogether, wherein fenoxaprop establish 2.75,5.5,11,22,44g a.i./hm
25 dosage processing, halosulfuronmethyl establishes 1.125,2.25,4.5,9,18g a.i./hm
25 dosage processing.The two mixedly establishes 5 assembly than processing fenoxaprop and halosulfuronmethyl: 1:8,1:2,2:1,8:1,32:1, dosage is respectively 2.5,5,10,20,40g a.i./hm
2, separately establish 1 clear water contrast, amount to 36 processing, repeat 4 times.
(2) crop dispenser dosage
36 processing are established in test altogether, wherein fenoxaprop establish 60,90,120,150,180g a.i./hm
25 dosage processing, halosulfuronmethyl establishes 30,50,70,90,110g a.i./hm
25 dosage processing.The two mixedly establishes 5 assembly than processing fenoxaprop and halosulfuronmethyl: 1:8,1:2,2:1,8:1,32:1, dosage is respectively 50,70,90,110,130g a.i./hm
2, separately establish 1 clear water contrast, amount to 36 processing, repeat 4 times.
4, application method
The dispenser time limit carries out cauline leaf spraying and processes while fixing on 3～4 leaf phases of wheat, 2～5 leaf phase of weeds, be placed in dispenser (ASS-4 type pesticide spraying system, DG8003 shower nozzle, atomisation pressure 2.75MPA in spray tower, spouting liquid 30Kg/ mu), treat that natural air drying is placed on cultivation in greenhouse and observes.
5, data survey and statistical analysis
(1) crop investigation
After dispenser, investigate each processing wheat and have or not symptom of chemical damage, record in detail symptom of chemical damage if having, within after medicine 20 days, measure each processing wheat fresh weight, calculate fresh weight inhibiting rate, the safety with clear and definite test medicine to wheat.
(2) weeds investigation
After dispenser, record in detail the symptom of being injured (as growth inhibition, chlorosis, deformity etc.) of weeds, after medicine 20 days, weigh each processing weeds acrial part fresh weight, adopt growth inhibition assay to calculate the fresh weight preventive effect of weeds.
(3) growth inhibition assay computing formula
In formula:
E-fresh weight preventive effect, unit is percentage (%);
T
0-contrast weeds acrial part fresh weight, unit is gram;
T
1-processing weeds acrial parts fresh weight, unit is gram.
(4) selectivity index computational methods
6, results and analysis is in Table 5-7
The preventive effect of table 5 fenoxaprop mixtures' ratios different from halosulfuronmethyl to amur foxtail
The safety of table 6 fenoxaprop mixtures' ratios different from halosulfuronmethyl to wheat
The selectivity index of table 7 fenoxaprop mixtures' ratios different from halosulfuronmethyl to wheat
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.
In the time of selectivity index >=4, represent that the selectivity of medicament between crops and weeds is very high, in the time of 2≤selectivity index < 4, represent that medicament has selectivity between crops and weeds, in the time of selectivity index < 2, represent the poor selectivity of medicament between crops and weeds.Security test test to wheat shows: fenoxaprop is greater than 2 with halosulfuronmethyl is mixed in the scope of weight ratio 1:8～32:1 to wheat selectivity index, to wheat safety.
The raw embodiment 3 that surveys
Eliminating weed in wheat field field control effectiveness test
1, test is processed
(1) 60% fenoxaprop halosulfuronmethyl wetting powder (1:8) 9g/ mu
(2) 60% fenoxaprop halosulfuronmethyl wetting powder (1:2) 9g/ mus
(3) 60% fenoxaprop halosulfuronmethyl wetting powder (2:1) 9g/ mus
(4) 60% fenoxaprop halosulfuronmethyl wetting powder (8:1) 9g/ mus
(5) 60% fenoxaprop halosulfuronmethyl wetting powder (32:1) 9g/ mus
(6) 6.9% fenoxaprop aqueous emulsion 78.3g/ mus
(7) 75% halosulfuronmethyl water dispersible granules 7.2g/ mus
(8) blank
8 processing are established in test, repeat for 4 times, process community for totally 32,20 square metres of every processing community areas, and random district group is arranged.(1)～(5) 60% fenoxaprop halosulfuronmethyl wetting powder (Shandong Binnong Technology Co., Ltd.'s production) is reagent agent, and 6.9% fenoxaprop aqueous emulsion and 75% halosulfuronmethyl water dispersible granules are contrast medicament.Every mu is watered 30 kilograms, adopts 552 third type sprayers (0.7mm aperture) even spraying.Field main weeds has clearvers, broadcasts ma wormwood artemisia, lamb's-quarters, hard grass, amur foxtail, wild oat etc.
2, pilot project and method
(1) safety: after dispenser, the situation of growing of investigation wheat, evaluates the safety of reagent agent to wheat.
(2) herbicidal effect: every community is got 4 points at random, 1/4 square metre of every some investigation, after medicine 30 days, record respectively weeds kind and strain number, calculate weeds strain preventive effect.
3, result of the test
(1) safety: dispenser " Invest, Then Investigate ", chemicals treatment district Plant Height in Wheat, Ye Se and blank district are basically identical, show that reagent agent (1)～(5) 60% fenoxaprop halosulfuronmethyl wetting powder is all to wheat safety.
(2) herbicidal effect: in table 8
30 days various weed control efficacies after table 8 medicine
As shown in Table 8,60% fenoxaprop halosulfuronmethyl wetting powder of different proportionings between 86.86～95.03%, is all better than contrasting medicament 6.9% fenoxaprop aqueous emulsion and 75% halosulfuronmethyl water dispersible granules (weeds strain preventive effect is respectively 60.93% and 59.54%) to common weed strain preventive effect.Illustrate that thus fenoxaprop and halosulfuronmethyl are within the scope of weight ratio 1:8～32:1, the weeds common to wheat paddock have preventive effect, and the lasting period is greater than one month, substantially can control the wheat paddock crop smothering in whole vegetative period, and this herbicidal composition is to wheat safety.
In sum, component of the present invention is reasonable, and the activity that preventive effect is better than each component while using separately, all has good preventive effect to annual weed and multiple broad leaved weed, has expanded control of weeds spectrum, has reached the object that expands herbicide spectrum simultaneously and increase the lasting period.
Claims (6)
1. a herbicidal composition, is characterized in that this activity of herbicidal compositions becomes to be divided into fenoxaprop and halosulfuronmethyl, and wherein the weight ratio of fenoxaprop and halosulfuronmethyl is 1:8-32:1.
2. herbicidal composition according to claim 1, the weight ratio that it is characterized in that ， fenoxaprop and halosulfuronmethyl is 1:2-8:1.
3. herbicidal composition according to claim 2, the weight ratio that it is characterized in that ， fenoxaprop and halosulfuronmethyl is 2:1.
4. according to the herbicidal composition described in any one in claim 1-3, it is characterized in that ， fenoxaprop and the halosulfuronmethyl percentage composition in herbicidal composition is 10-80%.
5. herbicidal composition according to claim 1, is characterized in that, said composition can be upper any formulation allowing of agricultural.
6. herbicidal composition according to claim 1, is characterized in that, this herbicidal composition is for eliminating weed in wheat field.
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