CN101310599B - Rice direct seeding field mixed herbicide - Google Patents

Rice direct seeding field mixed herbicide Download PDF

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CN101310599B
CN101310599B CN2008100974094A CN200810097409A CN101310599B CN 101310599 B CN101310599 B CN 101310599B CN 2008100974094 A CN2008100974094 A CN 2008100974094A CN 200810097409 A CN200810097409 A CN 200810097409A CN 101310599 B CN101310599 B CN 101310599B
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penoxsuam
pyrazosulfuron
agent
mixed herbicide
rice
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CN2008100974094A
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CN101310599A (en
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蒋勤军
王明康
孙长贵
杨会营
闫玉强
王晓辉
刘晓娇
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北京燕化永乐农药有限公司
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Abstract

The invention pertains to the technical field of pesticides and relates to a mixed herbicide used in direct-seeding rice fields. The mixed herbicide is characterized in that the mixed herbicide contains penoxsuam and pyrazosulfuron-ethyl and the effective components of the mixed herbicide are as follows according to percentage by weight: 0.1 percent to 50 percent of the penoxsuam and 0.2 percent to 50 percent of the pyrazosulfuron-ethyl. The mixed herbicide can be prepared into an oil-based suspending agent, a water dispersible granule and a wettable powder. The mixed herbicide is used for preventing and weeding weeds in the direct-seeding rice fields with obvious weeding effect, is safe for rice and has wide extension in weeding and obvious synergism.

Description

A kind of rice direct seeding field mixed herbicide

Technical field the invention belongs to chemical pesticide, is specifically related to a kind of complex weedicide that is used to prevent and kill off rice direct-seeding Tanaka weeds.

Background technology is according to FAO (Food and Agriculture Organization of the United Nation), about 50,000 kinds of whole world weeds sum, wherein there are 8000 kinds to be farmland weed, and harm about 250 kinds of staple food crop, according to statistics in 1972, the whole world reaches 20,400,000,000 dollars because of crop smothering causes crop failure every year, this shows that the harm of crop smothering is on the rise, becomes the key factor that influences crop yield.Use chemical herbicide not only can save large quantities of labours, raise labour productivity, and make that weeds obtain removing between the seedling that common mechanical is difficult to remove, make mechanization further perfect, traditional tillage and cultivation method also is improved.Therefore, the research of chemical herbicide and application more and more are subject to people's attention, and according to relevant department of the United Nations statistics, the sales volume of chemical herbicide proportion in the pesticide producing amount increases year by year, and the area of using weed killer herbicide is also in continuous expansion.From american agriculture production operation process: artificial weeding accounts for 50%, and weeding by machine accounts for 40%, and chemical weed control accounts for 55%, and visible chemical weed control is occupied an leading position in agricultural, and it is necessary researching and developing novel, efficient chemical herbicide.The use of agricultural chemicals plays an important role for the volume increase of world food and the improvement of people's living standard.Along with the development of agricultural cience and farming techniques, the use of chemical agent has become one of mode of increasing crop yield.

In recent years, Direct-seeding Rice is owing to saving of labor, abridged edition, reduce the generation of stripe virus disease seedling stage, and the spontaneous cultivated area of peasant is increasing, and the increasing transplant fields that replace are promoted rapidly in a lot of areas, but crop smothering is the major obstacle that influences its high yield, stable yields.The reason that crop smothering is on the rise is: direct sowing rice field is because growth is big for the space of weed growth early stage, and the rice field alternation of wetting and drying also helps weeds to be taken place, and this makes the crop smothering problem particularly outstanding.On the other hand, because rice paddy seed is very responsive to weed killer herbicide when sprouting, therefore can be of less types at the weed killer herbicide that use in live field, probe into direct sowing rice field safety, weed killer herbicide is particularly important efficiently.

The barnyard grass grass is the topmost monocotyledon weed of paddy field, and damaging range is often extensive from south to north African, generally occurs in each period of paddy growth, and its control is the main difficult problem of paddy field prevention and control of weeds always.At present, the topmost closed soil type control of paddy field barnyard grass grass with medicament main component has butachlor, the third careless amine, cauline leaf is handled low age barnyard grass grass weed killer herbicide main component anilofos, molinate, cauline leaf is handled above the average age for marriage barnyard grass grass weed killer herbicide main component dichloro quinolinic acid etc., but more or less there are a little problems in these weed killer herbicides, as the recessive drug injury problem of acetamide-group herbicides to rice seedling, most of cauline leafs processing remove the barnyard grass agent can only prevent and treat 2-3 leaf age barnyard grass grass in the past, dichloro quinolinic acid can be prevented and treated above the average age for marriage barnyard grass grass but paddy rice be existed the risk of poisoning, these remove the barnyard grass agent in the continuous use of China for many years in addition, and decline of a lot of local reflection drug effects even discovery barnyard grass grass have produced resistance to it.Bensulfuron-methyl and pyrazosulfuron are the main weed killer herbicides of domestic and international direct sowing rice field control nutgrass flatsedge and broad leaved weed, but because long-term use continuously, rice field main weeds such as difformed galingale herb, firefly Lin, arrowhead, Monochoria korsakowii, Monochoria vaginalis, Procumbent Falsepimpernel resistance in various degree occurred to sulfonylurea herbicides such as bensulfuron-methyls.In a word, market demand is to rice safety, can prevent and treat the weed killer herbicide of above the average age for marriage barnyard grass grass and resistance barnyard grass grass again.Under such background, The Dow Agrosciences, LLC. has introduced China in 2005 with rice outstanding person (penoxsuam) 25g/L oil-suspending agent just.This medicament has good control efficiency to above the average age for marriage barnyard grass grass, but the use cost of this medicament is higher, has limited the large tracts of land of this medicament and has used.Therefore, the use that with penoxsuam and another kind of mixture of herbicides, improve drug effect, reduce usage amount, enlarges this medicament is a urgent problem in producing at present.

(5,8-dimethoxy (1,2,4) triazole-(1,5-C) pyrimidine-2-base)-6-trifluoromethyl-benzene sulfanilamide (SN) belongs to triazolopyrimidine sulfonamides herbicide to penoxsuam (penoxsulam) chemical name: 2-(2,2-difluoro ethoxy)-N-.Work by suppressing the acetyl-lactic acid ester synzyme, medicine absorbs via grass cutting blade, leaf sheath or root, conducts to meristematic tissue, causes weed growth to stop, and yellow is dead then.Be used to prevent and treat the rice direct seeding field annual weed, to barnyard grass grass super-high-efficient, but to the anti-heterodyne of part grassy weed, nutgrass flatsedge and broadleaved herb.This medicament action target is acetolactate synthestase (ALS), the weeds of anti-sulfonylurea herbicide significantly are lower than other sulfonylurea medicaments the cross resistance level of triazolopyrimidine sulfonamides herbicide according to the literature, and the activity of weeding of penoxsuam and other ALS inhibitor also have notable difference, so penoxsuam is the comparatively ideal weed killer herbicide of control weeds in paddy field.

Pyrazosulfuron (pyrazosulfuron-ethyl) chemical name is: 5-(4,6-dimethoxypyridin base-2-carbamyl amine sulphonyl)-1-methylpyrazole base-4-Ethyl formate, belong to sulfonylurea herbicide, and be a kind of selectivity inner sucting conduction type weed killer herbicide.Can be absorbed by root of weeds and blade, and conduction rapidly in vivo, it is synthetic to suppress weeds amino acid, makes the very fast stasi of its bud and root.Be mainly used in transplanting rice field, rice seedling bed and direct sowing rice field and prevent and kill off annual weed and part perennial weeds such as Monochoria vaginalis, mexicana, Procumbent Falsepimpernel, fescue, difformed galingale herb.The barnyard grass grass there is strong inhibitory action, broad leaved weed is had special efficacy.To rice safety.Preceding or the seedling post processing of bud, preventive effect is very high, its active bensulfuron-methyl that surpasses.But the preventive effect to the barnyard grass grass is relatively poor.

By pertinent literature retrieval, domestic relevant patent documentation and the report that penoxsuam and pyrazosulfuron are arranged respectively.Application number is that 200680004602.8 patent of invention discloses the penoxsuam as turfgrass, vineyard and orchard ground weed killer herbicide, is used for controlling broad leaved weed and nutgrass flatsedge in turfgrass and vine and the bottom surface, orchard.Application number is that 200510117353.0 patent of invention discloses pyrazosulfuron and the composite a kind of weed killer herbicide made of cyhalofop-butyl.Pyrazosulfuron is compared with other sulfonylurea herbicides, and outstanding feature is that broad leaved weed is had special efficacy, and active high.Penoxsuam and pyrazosulfuron list are a lot of not enough with existing, it is wide inadequately to kill the grass spectrum, two kinds of weed killer herbicide lists are with all there being the part weeds not prevent and kill off, single higher with the penoxsuam cost, when the peasant uses in the mixing of two kinds of preparations, grasp all being difficult on using method, operation, the consumption, the dispenser that leads to errors exerts an influence to paddy rice.Barnyard grass grass generating capacity in recent years heightens, and main cause is that general rice field weed killer herbicide commonly used is invalid to it.Penoxsuam is to barnyard grass grass preventive effect excellence, but penoxsuam is to the anti-heterodyne of Procumbent Falsepimpernel, false loosestrife and Eclipta prostrata.Pyrazosulfuron has only inhibitory action to the barnyard grass grass.Can replenish mutually after penoxsuam and pyrazosulfuron be mixed and enlarge herbicidal spectrum, remedy penoxsuam to Procumbent Falsepimpernel, false loosestrife and Eclipta prostrata preventive effect shortcoming on the low side as pyrazosulfuron.Through the demonstration checking, penoxsuam and pyrazosulfuron complex weedicide just can be annihilated for 1 time the multiple main weeds dispenser in rice field, to rice seedling safety, are worth promoting.Therefore, we carry out penoxsuam and pyrazosulfuron composite, are used for preventing and treating grassy weed, nutgrass flatsedge and the broad leaved weeds such as above the average age for marriage barnyard grass grass of direct sowing rice field.

Summary of the invention the objective of the invention is to the shortcoming at prior art, provides that a kind of herbicidal effect is good, broad weed-killing spectrum, security performance height, production-increasing function is remarkable, dispenser is convenient, toxicity is low complex weedicide.

The technical scheme that realizes the object of the invention is:

A kind of complex weedicide contains penoxsuam and pyrazosulfuron.

Above-mentioned complex weedicide contains penoxsuam 0.1%~50%, pyrazosulfuron 0.2%~50%.

Above-mentioned complex weedicide, its oil suspending agent constituent and percentage by weight thereof are: penoxsuam 0.1%~30%, pyrazosulfuron 0.2%~20%, wetting agent 0.2%~8%, dispersant 0.1%~10%, stabilizing agent 0.2%~6%, thickener 0.2%~5%, antifreezing agent 0.05%~4%, defoamer 0.2%~5%, cosolvent 1%~6%, solvent 1%~90%.Each component sum is 100%.

Said herbicidal composition, its water-dispersible granules constituent and percentage by weight thereof are: penoxsuam 0.5%~15%, pyrazosulfuron 0.2%~20%, wetting agent 1%~20%, dispersant 1%~15%, spreader-sticker 1%~5%, stabilizing agent 0%~2%, bleeding agent 1%~10%, filler 10%~80%.Each component sum is 100%.

Above-mentioned complex weedicide, its wetting powder constituent and percentage by weight thereof are: penoxsuam 0.5%~20%, pyrazosulfuron 0.2%~25%, wetting agent 1%~10%, dispersant 1%~20%, spreader-sticker 0.1%~10%, bleeding agent 1%~15%, filler 5%~85%.Each component sum is 100%.

Wetting agent described in the above-mentioned complex weedicide is that neopelex, calcium dodecyl benzene sulfonate, lauryl sodium sulfate, lignosulfonates, alkyl phenol formaldehyde resin polyoxyethylene ether, aliphatic alcohol sulfate, alkylaryl sulfonates, naphthalene sulfonic acid-formaldehyde condensation product, phenethyl phenol polyethenoxy ether, Nonyl pheno base ether, tea are withered, among the Chinese honey locust etc. one or more.

Dispersant described in the above-mentioned complex weedicide is one or more in lignosulfonates, alkylbenzenesulfonate, alkylphenol polyoxyethylene, fatty alcohol-polyoxyethylene ether, Nonyl pheno base ether, alkyl ethyl sulfonate, alkylnaphthalene sulfonate formaldehyde condensation products and the polycarboxylic acid.

Spreader-sticker described in the above-mentioned complex weedicide is one or more in polyvinyl alcohol, alkyl diphenyl ether disulphonic acid sodium, poly-trisiloxanes, the triethanolamine oleate.

Stabilizing agent described in the above-mentioned complex weedicide be in epoxidized vegetable oil such as epoxidized linseed, the epoxidized soybean oil one or more.

Bleeding agent described in the above-mentioned complex weedicide is one or more in sorbitan fatty acid ester APEO, aliphatic alcohol polyethenoxy base ether or the Nonyl pheno base ether.

Thickener described in the above-mentioned complex weedicide be polyvinyl alcohol, carboxymethyl cellulose or xanthans etc. one or more.

Antifreezing agent described in the above-mentioned complex weedicide is one or more in ethylene glycol, propane diols, glycerine, polyethylene glycol, the sorbierite.

Defoamer described in the above-mentioned complex weedicide is silicone based, as Si18, S-29, FZ-880 etc. one or more.

Cosolvent described in the above-mentioned complex weedicide is one or more in methyl alcohol, ethanol, acetone, DMF, acetonitrile, methyl-sulfoxide, pyrrolidones, the trichloroethanes.

Solvent described in the above-mentioned complex weedicide is one or more in soybean oil, rapeseed oil, cottonseed oil, Semen Ricini oil, turpentine oil, enriching vegetable oil, sunflower oil, paraffin oil, methyl oleate, the senior fatty hydrocarbon ils of methyl naphthalene.

Filler described in the above-mentioned complex weedicide is one or more in kaolin, bentonite, talcum powder, precipitated calcium carbonate, white carbon, diatomite, potter's clay, attapulgite, atlapulgite, the gypsum.

Above-mentioned complex weedicide, its described formulation can be oil suspending agent, water-dispersible granules, wetting powder.

The production method of above-mentioned complex weedicide oil suspending agent is: in proportion penoxsuam, the former medicine of pyrazosulfuron are joined in the reactor with wetting agent, dispersant, stabilizing agent, thickener, antifreezing agent, defoamer, cosolvent, solvent, stirred 2 hours, open baiting valve at the bottom of the still, material is injected sand mill to be ground, material fineness after the grinding reaches 98% by discharging behind 325 mesh standard sieves, material is put in the high-shear emulsifying still again, promptly gets herbicidal composition oil suspending agent of the present invention after the emulsification.

The production method of above-mentioned complex weedicide wetting powder is: in proportion penoxsuam, pyrazosulfuron are joined in the tapered mixer with wetting agent, dispersant, spreader-sticker, bleeding agent, filler and mix more than 2 hours, mixed material joined in the airslide disintegrating mill pulverize, material after the pulverizing joins in the tapered mixer again and mixed 2 hours, mixed material fineness reaches 98% by 325 mesh standard sieves, require to detect according to product quality, require to make the wetting powder that meets standard-required according to product standard.

The production method of above-mentioned complex weedicide water-dispersible granules is: in proportion penoxsuam, pyrazosulfuron are joined in the tapered mixer with wetting agent, dispersant, spreader-sticker, stabilizing agent, bleeding agent, filler and mix more than 2 hours, mixed material joined in the airslide disintegrating mill pulverize, material after the pulverizing joins in the tapered mixer again and mixed 2 hours, mixed material fineness reaches 98% by 325 mesh standard sieves, obtains wetting powder.Then with wetting powder and quantitative purified water; add in the kneader simultaneously and mediate; make the material of shaping; put this material in Squeezinggranulator granulation at last, the product after the granulation carries out drying in 54 ℃ of baking ovens, dried material; use 10 orders and 60 purpose standard screens to sieve; get the middle material of two sieves, require to detect, require to make the water-dispersible granules that meets standard-required according to product standard according to product quality.

The advantage that the present invention has: carry out two kinds of weed killer herbicides composite, not only herbicidal effect is good, to rice safety, with strong complementarity, and broad weed-killing spectrum, pyrazosulfuron have remedied penoxsuam to part broad-leaved section weeds, sedge weed and part perennial weed weak effect or invalid substantially shortcoming, and be effective to the most main weeds of rice direct seeding field, comprise barnyard grass grass, annual nutgrass flatsedge and many broad leaved weeds, wherein the control efficiency to the barnyard grass grass is particularly outstanding.Improved the lasting period greatly and killed the grass spectrum, above the average age for marriage barnyard grass grass has been had splendid preventive effect.Also significantly reduce cost, only needed a drug, just can prevent and treat the harm of multiple grassy weed, sedge weed and broad leaved weed, and obvious effect of increasing production, excellent rice safety, formulation advanced person, absorb rapidly, resistance of rainwater washing against, social benefit is outstanding.Therefore, penoxsuam and pyrazosulfuron are composite will to be a kind of novelty, practical novel formulation, and this compositely also has a certain practicality simultaneously.

We adopt the interaction between equivalent collimation method evaluation penoxsuam and the pyrazosulfuron to description of drawings in embodiment.Utilize dosage logarithm-probability value method to calculate ED 90Value is drawn ED 90Equivalent line, and by ED 90Equivalent line is estimated two kinds of weed killer herbicide correlations, and obtains best ratio range.

Employed former medicine, auxiliary agent are other producers' purchases in embodiment following examples.

Embodiment 1

With the former medicine of 1.0kg penoxsuam, 5.1kg the former medicine of pyrazosulfuron, the 6kg neopelex, the 6kg polyoxyethylene nonylphenol ether, the 3kg epoxidized soybean oil, 1.5kg carboxymethyl cellulose, 2kg ethylene glycol, 0.5kgS-29 defoamer, 4kg ethanol, the 35.45kg methyl oleate, the 35.45kg soybean oil joins reactor together, stirred 2 hours, open baiting valve at the bottom of the still, material is injected sand mill grind, the material fineness after the grinding reaches 98% by discharging behind 325 mesh standard sieves, material is put in the high-shear emulsifying still again, promptly gets herbicidal composition oil suspending agent of the present invention after the emulsification.

Embodiment 2

With the former medicine of 1.0kg penoxsuam, 6.2kg former medicine of pyrazosulfuron and 12kg neopelex, the 10kg sodium lignin sulfonate, the 2kg polyvinyl alcohol, 2kg lauryl alcohol polyethylene glycol oxide base ether, 33.4kg kaolin, 33.4kg bentonite, joining together in the tapered mixer mixes more than 2 hours, mixed material joined in the airslide disintegrating mill pulverize, material after the pulverizing joins in the tapered mixer again and mixed 2 hours, and mixed material fineness reaches 98% by 325 mesh standard sieves, obtains wetting powder.Then with wetting powder and 20kg purified water; add in the kneader simultaneously and mediate; make the material of shaping; put this material in Squeezinggranulator granulation at last; product after the granulation carries out drying in 54 ℃ of baking ovens, dried material uses 10 orders and 60 purpose standard screens to sieve; get the middle material of two sieves, make water-dispersible granules.

Embodiment 3

With the former medicine of 1.2kg penoxsuam, 3.5kg former medicine of pyrazosulfuron and 10kg neopelex, the 8kg sodium lignin sulfonate, the 4kg polyvinyl alcohol, 5kg Nonyl pheno base ether, 34.15kg kaolin, 34.15kg bentonite, joining together in the tapered mixer mixes more than 2 hours, mixed material joined in the airslide disintegrating mill pulverize, material after the pulverizing joins in the tapered mixer again and mixed 2 hours, and mixed material fineness reaches 98% by 325 mesh standard sieves, obtains wetting powder.

Embodiment 4

With the former medicine of 1.2kg penoxsuam, 5.0kg the former medicine of pyrazosulfuron, the 12kg neopelex, the 8kg polyoxyethylene nonylphenol ether, 3.5kg epoxidized soybean oil, 1.5kg carboxymethyl cellulose, 2kg glycerine, the 1kgS-29 defoamer, 5kg acetone, the 60.8kg methyl oleate joins reactor together, stirred 2 hours, open baiting valve at the bottom of the still, material is injected sand mill grind, the material fineness after the grinding reaches 98% by discharging behind 325 mesh standard sieves, material is put in the high-shear emulsifying still again, promptly gets herbicidal composition oil suspending agent of the present invention after the emulsification.

Embodiment 5

With the former medicine of 1.1kg penoxsuam, former medicine of 6kg pyrazosulfuron and 12kg neopelex, the 9kg sodium lignin sulfonate, 3.5kg polyvinyl alcohol, 2.5kg lauryl alcohol polyethylene glycol oxide base ether, 35kg kaolin, 30.9kg bentonite, joining together in the tapered mixer mixes more than 2 hours, mixed material joined in the airslide disintegrating mill pulverize, material after the pulverizing joins in the tapered mixer again and mixed 2 hours, and mixed material fineness reaches 98% by 325 mesh standard sieves, obtains wetting powder.Then with wetting powder and 18kg purified water; add in the kneader simultaneously and mediate; make the material of shaping; put this material in Squeezinggranulator granulation at last; product after the granulation carries out drying in 54 ℃ of baking ovens, dried material uses 10 orders and 60 purpose standard screens to sieve; get the middle material of two sieves, make water-dispersible granules.

Be composite synergistic effect and the best ratio range of whether producing of checking penoxsuam and pyrazosulfuron, we adopt the interaction between equivalent collimation method evaluation penoxsuam and the pyrazosulfuron.Give birth to surveying object is the barnyard grass grass, and the cauline leaf spraying is handled after barnyard grass grass 3 leaves respectively are provided with bud under the dosage, and 4 repetitions are established in each processing, and other establishes blank.Single agent penoxsuam is provided with 0.25,0.50,1.0,2,4,8g ai.hm -2Totally 6 processing; Single agent pyrazosulfuron is provided with 2.0,4.0,6.0,8.0,10.0,12.0g ai.hm -2Totally 6 processing, again with two each dosage of medicament composite in twos respectively be 36 processing that are mixed.The acrial part fresh weight is respectively handled in the 20d weighing behind medicine, asks the fresh weight inhibiting rate.Utilize dosage logarithm-probability value method to calculate ED then 90Value, and draw ED 90Equivalent line is by ED 90Equivalent line is estimated two kinds of weed killer herbicide correlations, and obtains best ratio range.

Table 1 penoxsuam and the agent of pyrazosulfuron list and composite processing are to the fresh weight inhibiting rate of barnyard grass grass

Penoxsuam suppresses ED to the fresh weight of barnyard grass grass under the table 2 pyrazosulfuron quantitative Treatment 90Value

Pyrazosulfuron g ai.hm -2 Regression equation (y=) Correlation coefficient (r) ED90(g?ai.hm -2) 0 Y=0.739x+5.1664 0.9775 32.29 2 Y=0.8756x+5.3406 0.9747 11.88 4 y=0.8598x+5.5503 0.9238 7.09 6 y=0.7736x+5.6946 0.9419 5.74 8 Y=0.7198x+5.8402 0.9428 5.10 10 y=0.654+5.9729 0.9049 3.93 12 y=0.6393x+6.0985 0.9262 1.93

Pyrazosulfuron suppresses ED to the fresh weight of barnyard grass grass under the table 3 penoxsuam quantitative Treatment 90Value

Penoxsuam g ai.hm -2 Regression equation (y=) Correlation coefficient (r) ED 90(g?ai.hm -2) 0 y=1.08x+4.1876 0.9661 86.86 0.25 Y=1.0007x+4.4093 0.9953 74.29 0.50 Y=1.1509x+4.6598 0.9245 25.65 1.0 Y=1.006x+5.0983 0.9706 15.00 2.0 Y=1.0574x+5.2063 0.9787 13.22 4.0 Y=0.626x+5.7352 0.9732 7.46 8.0 Y=0.6146x+5.843 0.9635 5.17

By table 1 as seen, each fresh weight inhibiting rate of handling the barnyard grass grass improves along with the increase of dosage.Data in the his-and-hers watches 1 are carried out dose-response regression analysis processing, obtain different proportionings and handle following fresh weight inhibiting rate (ED to the barnyard grass grass 90), regression equation etc. (see Table 2, table 3).Under the pyrazosulfuron quantitative Treatment, penoxsuam is to the ED of the fresh weight inhibition of barnyard grass grass 90Value reduces (table 2) with the raising of pyrazosulfuron dosage, and under the penoxsuam quantitative Treatment, pyrazosulfuron is to the ED of barnyard grass grass fresh weight inhibition equally 90Value improves with penoxsuam dosage and reduces.(table 3)

Dosage with pyrazosulfuron is abscissa, and the dosage of penoxsuam is that ordinate is figure.Pyrazosulfuron and the agent of penoxsuam list are to the ED of barnyard grass grass on the connection coordinate 90Be worth resulting straight line and be the summation action line of these two kinds of herbicide mixtures, promptly theoretical equivalent line.Then with 12 composite ED 90Value is marked on the coordinate diagram, removes the curve that marginal point is formed by connecting, and is exactly the ED of the composite processing of penoxsuam and pyrazosulfuron to the barnyard grass grass 90The equivalence line chart.(seeing Figure of description Fig. 1)

As seen from Figure 1, the ED of each hybrid combining 90Value is estimated principle according to equivalent collimation method all below theoretical equivalent line, illustrates that these two medicaments use with in designing dosage range, and the barnyard grass grass is had certain synergistic effect.And the synergistic effect between (25.65,3) two equivalent line coordinate points is the most obvious in (4,4.96), i.e. penoxsuam 3-4.96g ai.hm -2With pyrazosulfuron 4-25.65g ai.hm -2Ratio range reach best synergistic effect.

By give birth to surveying of equivalent collimation method, we find that penoxsuam and pyrazosulfuron are composite in certain ratio range, and obvious synergistic effect is arranged, and can reduce the mu dosage of penoxsuam greatly, saving cost, raising drug effect.We choose 5 kinds of proportionings (example 1-5) and make various formulations in the ratio range of synergistic effect is arranged, and carry out field trial, further verify the synergistic effect after composite of penoxsuam and pyrazosulfuron.

We carry out field trial with prescription 5 by picked at random prescription 3, and the test site is located at the Nanchang, carries out at direct sowing rice field, weeds in field has barnyard grass grass, difformed galingale herb during test, leaf age is the two leaves leaf phases one heart stage to four, and broad leaved weed is a Monochoria vaginalis etc., and leaf age is that two leaves are to tri-leaf period.Test is handled and is adopted spray-on process, drains water in field before the dispenser, and 24h pours water after the dispenser, and keeps shoaling layer 5-7d.Medicine for examination has prescription 3, prescription 5,2.5% penoxsuam, 10% pyrazosulfuron, investigation method: leaf look, the growing way of 3d, 5d, 15d range estimation paddy rice behind the medicine, observe the safety of medicament to paddy rice; When results, survey and produce, and investigation plant height, spike length, unit are spike number and thousand kernel weight.The preventive effect investigation adopts the every sub-district of chessboard method to get 5 points, area 0.2m 2, the strain preventive effect is calculated in 20d, 35d investigation after medication, adds the fresh weight preventive effect of surveying weeds when investigating for the last time.

Table 4 penoxsuam pyrazosulfuron is to the strain preventive effect (20d) of direct sowing rice field weeds

Annotate: data are the mean value of 3 repetitions in the table, strain number: be the average strain number of unit are.

Table 5 penoxsuam pyrazosulfuron is to the strain preventive effect (35d) of direct sowing rice field weeds

Annotate: data are the mean value of 3 repetitions in the table, strain number: be the average strain number of unit are.

Table 6 penoxsuam pyrazosulfuron is to the fresh weight preventive effect (35d) of direct sowing rice field weeds

Annotate: data are 3 mean values that repeat, fresh weight: the average weeds fresh weight of unit are.

From above-mentioned data as can be seen, the effect that the preventive effect when penoxsuam and pyrazosulfuron complex preparation control barnyard grass grass, nutgrass flatsedge, Monochoria vaginalis etc. all is higher than single agent far away when using.Behind the medicine during 30d strain preventive effect and the fresh weight preventive effect to the barnyard grass grass all reach 100%, also more than 90%, and the strain preventive effect less than 60% of all the other two kinds of single-dose agent, fresh weight preventive effect be less than 70% to the preventive effects of all the other weeds, the difference performance between each is handled is extremely remarkable.And from data as can be seen, 30d behind the medicine, penoxsuam pyrazosulfuron complex preparation can keep good control efficiency, and the preventive effect of all the other single-dose agent has obviously begun to descend.Therefore, penoxsuam pyrazosulfuron complex preparation has not only improved drug effect, and prolonged the lasting period, all there have been significant raising quick-acting and lasting period that this complex preparation is described than single agent, use this complex preparation, can reduce the use cost of peasant household greatly, have the effect that a drug solves the multiple weeds in rice field.

3d, 5d, 15d observe the growing state of paddy rice behind the medicine, do not find leaf color and the abnormal plant of growing way when each investigation, illustrate that complex preparation is safe to paddy rice.Because penoxsuam pyrazosulfuron complex preparation can effectively be prevented and kill off various weeds, can not cause weeds contentions nutrition, cover phenomenon such as paddy rice photosynthesis, therefore the paddy rice seedling leaf color of respectively handling the sub-district is emerald green, stem is sturdy, and plant height is apparently higher than CK (clear water processing) sub-district.

Table 7 penoxsuam pyrazosulfuron is to the influence of direct sowing rice field tree characteristics, output