CN103271071B - Penoxsuam and fentrazamide Herbicidal combinations - Google Patents

Abstract

The invention discloses a kind of Herbicidal composition for rice field containing penoxsuam and fentrazamide, penoxsuam and fentrazamide ratio of weight and number is in the composition 5:1 ~ 1:5, and preferred weight number ratio is 2:1.The control efficiency of Herbicidal combinations of the present invention is significantly improved than single dose, reduces the using dosage of agricultural chemicals, decreases the adverse effect of agricultural chemicals to ecotope; To the comprehensive regulation important in inhibiting of Weed Resistance, there is huge economic benefit and social benefit.

Description

Penoxsuam and fentrazamide Herbicidal combinations

Technical field

The present invention relates to a kind of herbicide composition for paddy fields, is with penoxsuam and fentrazamide for active ingredient, for preventing and kill off paddy field annual weed.

Background technology

Chemical method weeding is agriculturally one of Main Means controlling weeds.In recent years, because some weed killer herbicide kind large area are used alone, a lot of weeds have been caused to develop immunity to drugs.Simultaneously, grass when weeds occur is mutually complicated, not only annual and perennial weed is mixed raw, draft, liana and shrub have concurrently, and weeds emerge uneven, seed, low age, the staggered generation of weeds at advanced age, so when weed killer herbicide kind is used alone, defect in a certain respect and limitation all can be shown.

Penoxsuam is rice field broad-spectrum herbicide after bud, effectively can prevent and kill off barnyard grass, moleplant seed and annual sedge weed, and effective to numerous broad leaved weed, and the lasting period is long.Meanwhile, it also can prevent and kill off anti-bensulfuron-methyl weeds in rice field, and has residual activity to many broad-leaveds and sedge weed and barnyard grass etc., is the kind that herbicide spectrum in current herbicide for rice field is the widest.But penoxsuam is strong inhibitor of acetolactate synthetase, medicament presents comparatively slow, needs certain hour weeds just dead gradually.

Fentrazamide, it is efficient paddy field weed-killer agent, can be absorbed by the root of plant, stem, leaf and be transmitted to the meristematic tissue on root and bud top, suppress its cell division, growth stops, metaplasia, make growing point, internode meristematic tissue downright bad, lobus cardiacus by green purpling look, base portion browning look and withered, thus play herbicide effect.Weeds are had to the selectivity of height; to rice safety; and have good protection of the environment and ecological characteristic, be applicable to paddy rice (transplant field, seedling throwing field, live field) and prevent and treat grassy weed (barnyard grass, moleplant seed), nutgrass flatsedge material weeds (difformed galingale herb, needle spikesedge herb) and broad leaved weed (Monochoria vaginalis) etc.

When penoxsuam and the single use of fentrazamide, all there are certain defect and limitation.

The mixture of the present inventor to penoxsuam and fentrazamide conducts in-depth research, on the basis of a large amount of formula indoor screening tests and field medicine effect test, find that penoxsuam and fentrazamide carry out mixture, within the scope of certain mixed ratio, obvious synergistic effect is shown to paddy field weed, after further study, the present invention is completed.

Mixture and the application of penoxsuam and fentrazamide there is no report at present.

Summary of the invention

Technical problem to be solved: the object of the invention is to solve above-mentioned weed killer herbicide is actual use in deficiency, provide a kind of efficient, low toxicity, low cost, quick-acting are good, and the lasting period is long, is conducive to the Herbicidal combinations of the weeds in paddy field comprehensive regulation.

Another object of the present invention is to provide this Herbicidal combinations to be applied to prevents and kill off paddy field annual weed.

Technical scheme: for achieving the above object, the invention provides a kind of Herbicidal combinations being active ingredient with penoxsuam and fentrazamide, and the ratio of weight and number of penoxsuam and fentrazamide is 5:1 ~ 1:5, and preferred weight number ratio is 2:1.

Described Herbicidal combinations according to well known to a person skilled in the art method, can be mixed with the application forms of the applicable agricultural uses such as suspending agent, oil-suspending agent, aqueous emulsion, wetting powder, water dispersible granules.

Described Herbicidal combinations is also containing the agriculturally acceptable insecticides adjuvant of preparation needed for pesticidal preparations, be selected from one or more in solvent, emulsifier, wetting agent, stabilizing agent, dispersant, bleeding agent, thickener, defoamer, antifreezing agent, disintegrant, binding agent, filler, carrier, medium, surfactant, be known substance, various auxiliary agents conventional in pesticidal preparations, can change to some extent according to different situations, be not particularly limited.

The production technology of the various application forms of described Herbicidal combinations all belongs to existing known technology, does not repeat them here.

Herbicidal combinations provided by the invention, is applied to and prevents and kill off paddy field annual weed.

Herbicidal combinations provided by the invention, usually adopts the method for directed spraying to use, also can adopt other operation techniques agriculturally applied as required.

Herbicidal combinations provided by the invention has following beneficial effect:

1, Herbicidal combinations provided by the invention, obvious synergistic effect is shown in certain ratio range, the control efficiency of composition is significantly improved than single dose, reduce the using dosage of agricultural chemicals, decrease times for spraying, reduce drug cost, decrease the adverse effect of agricultural chemicals to ecotope.

2, Herbicidal combinations provided by the invention, the combination of two kinds of active ingredients, expands herbicidal spectrum, and a drug can solve various weed problem, compensate for defect when single dose uses and limitation.

3, Herbicidal combinations provided by the invention, two kinds of active ingredient mechanism of action are different, can overcome the shortcoming that long-term single use easily produces resistance, extend the service life of medicament, to the comprehensive regulation important in inhibiting of Weed Resistance.

4, Herbicidal combinations provided by the invention, drug effect plays rapidly, and the lasting period is long, and use cost is low, easy to use, time saving and energy saving, and it applies huge economic benefit and social benefit.

Embodiment

In order to make object of the present invention, technical scheme and advantage more short and sweet, the following specific embodiment of the present invention is described, but the present invention is only limitted to absolutely not these examples.The following stated is only the good embodiment of the present invention, only for describing the present invention, can not be interpreted as the restriction to scope of the present invention.It should be pointed out that all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

In these embodiments, unless otherwise indicated, all percentage is all weight percentage.

example of formulations one(12% penoxsuam fentrazamide wetting powder):

Penoxsuam 8%,

Fentrazamide 4%,

Neopelex 6%,

Sodium lignin sulfonate 4%,

Talcum powder 2%,

White carbon 2%,

Attapulgite is supplemented to 100%.

Mix entering in blender after above-mentioned formula in proportion coarse crushing, more namely obtain 12% penoxsuam fentrazamide wetting powder after air-flow crushing.

example of formulations two(12% penoxsuam fentrazamide suspending agent):

Penoxsuam 8%,

Fentrazamide 4%,

Agriculture breast 1601# 10%,

To oleoyl amido methyl phenyl ethers anisole sulfonic acid 5%,

Alkyl phenol formaldehyde resin polyoxyethylene ether sulphate 4%,

Bentonite 3%,

Xanthans 0.1%,

Organosilicon 0.4%,

Glycerine 4%,

Deionized water complements to 100%.

Above-mentioned formula is pulverized in proportion in advance, then adds in sand mill and grind, the obtained 12% penoxsuam fentrazamide suspending agent of allotment after high shear mixing.

example of formulations three(15% penoxsuam fentrazamide water dispersible granules):

Penoxsuam 10%,

Fentrazamide 5%,

Lauryl sodium sulfate 5%,

Polycarboxylate 4%,

Sodium chloride 2%,

Polyethylene glycol 2%,

Kaolin complements to 100%.

By above-mentioned formula dry pulverization process, granulation, drying, the obtained 15% penoxsuam fentrazamide water-dispersible granules of screening in proportion.

example of formulations four: (12% penoxsuam fentrazamide oil-suspending agent):

Penoxsuam 8%,

Fentrazamide 4%,

Vegetable oil 30%,

Bentonite 0.8%,

Methylated vegetable oil complements to 100%.

By above-mentioned formula Central Plains medicine, solvent, emulsifiers dissolve uniformly oil phase; Under high velocity agitation, the obtained 12% penoxsuam fentrazamide oil-suspending agent of mixing.

assays Example one:penoxsuam and fentrazamide mixture measure the synergy of paddy field weed.

For understanding penoxsuam and fentrazamide mixture further to the synergy of paddy field weed, the present inventor has carried out formula indoor screening test to penoxsuam and fentrazamide mixture.

Test material:

Chickweed [ stellaria media(L.) Cyrillus] (field collection Seed storage).

Barnyard grass [ echinochloa crusgalli(L.) Beaw Setaria] (field collection Seed storage).

Test apparatus:

Controlled illumination box; The accurate laboratory spray tower of POTTER; Electronic balance (sensibility reciprocal 0.1mg); Micropipette rifle etc.

Test method:

The purity first taking certain mass is the former medicine of 98% penoxsuam, purity is the former medicine of 96% fentrazamide, adds the Tween 80 aqueous solution dilution that acetone fully dissolves rear use 0.1%, is mixed with single dose mother liquor respectively, arrange serial proportioning according to mixture object, each proportioning arranges 5 ~ 7 concentration gradients.Select representative susceptible weeds seed according to single dose herbicide spectrum, be cultured to 1 leaf 1 heart for subsequent use.By select numbering the process of weeds cauline leaf after, to be placed in illumination box incubated at room temperature 5 days, to calculate control efficiency (fresh weight), then with method of least squares calculate suppress in dense EC ₅₀(95% confidence limit), then calculate co-toxicity coefficient (CTC) by the abundant method of Sun Yun.

Co-toxicity coefficient (CTC) >=120 shows as synergistic effect; Co-toxicity coefficient (CTC)≤80 shows as antagonism; 80 < co-toxicity coefficient (CTC) < 120 show as summation action.

Actual measurement toxicity index (ATI)=(standard agent EC50/reagent agent EC50) × 100.

Theoretical toxicity index (the TTI)=percentage composition of A (in the toxicity index × mixture of the A)+percentage composition of B (in the toxicity index × mixture of B).

Co-toxicity coefficient (CTC)=[the theoretical toxicity index (TTI) of mixture actual measurement toxicity index (ATI)/mixture] × 100.

Measurement result shows (see table 1 and table 2), and penoxsuam and fentrazamide, between mixed ratio 5:1 ~ 1:5, have obvious synergistic effect, and especially at 2:1, synergistic effect is more obvious, and co-toxicity coefficient is more than 160.

Table 1, different ratio penoxsuam and fentrazamide measure the synergy of nutgrass flatsedge.

Table 2, different ratio penoxsuam and fentrazamide measure the synergy of barnyard grass.

assays Example two:penoxsuam and fentrazamide mixture composition for preventing and controlling direct seading rice

Field weed field control effectiveness test.

Reagent agent and dispenser dosage:

(1) 12% penoxsuam fentrazamide oil-suspending agent (4% penoxsuam: 8% fentrazamide), mu 30 grams, preparation (1#).

(2) 12% penoxsuam fentrazamide suspending agents (3% penoxsuam: 6% fentrazamide), mu 30 grams, preparation (2#).

Contrast medicament and dispenser dosage:

(1) 2.5% penoxsuam oil-suspending agent, mu 60 grams, preparation (3#).

(2) 10% fentrazamide missible oil, mu 40 grams, preparation (4#).

Dispenser period: the weeds 2-3 leaf phase, be watered even spraying.

Result of the test is in table 3.As can be seen from the test results: after dispenser 15 days, Herbicidal combinations of the present invention to total preventive effect of direct seading rice annual weed all more than 83.2%; After dispenser 30 days, total preventive effect was all more than 97.6%, and significantly better than the single dose of contrast, synergistic effect is remarkable, and expands herbicidal spectrum, and quick-acting and lasting period are obviously better than single dose.

Table 3, control direct seading rice field broad leaved weed field control effectiveness test result.

Claims (4)

1. penoxsuam and a fentrazamide Herbicidal combinations, is characterized in that: comprise two kinds of active ingredient penoxsuams and fentrazamide, and penoxsuam and fentrazamide ratio of weight and number is in the composition 5:1 ~ 1:5.

2. penoxsuam according to claim 1 and fentrazamide Herbicidal combinations, is characterized in that: penoxsuam and fentrazamide ratio of weight and number is in the composition 2:1.

3. penoxsuam according to claim 1 and fentrazamide Herbicidal combinations, is characterized in that, the formulation of described Herbicidal combinations is the one in suspending agent, oil-suspending agent, wetting powder, water dispersible granules.

4. penoxsuam according to claim 1 and 2 and the application of fentrazamide Herbicidal combinations in the annual weed of water prevention rice field.