CN113170790A

CN113170790A - Weeding composition containing clethodim and bixlone

Info

Publication number: CN113170790A
Application number: CN202110455699.0A
Authority: CN
Inventors: 任建荣; 任西财; 黄翠林
Original assignee: Meifeng Agricultural Science And Technology Shanghai Co ltd
Current assignee: Meifeng Agricultural Science And Technology Shanghai Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-07-27

Abstract

The invention provides a weeding composition containing clethodim and bixlone, which comprises active ingredients of clethodim and bixlone, wherein the mass ratio of the clethodim to the bixlone in the weeding composition is 10: 1-1: 10. Within the range of the mixture ratio, the composition has obvious preventing and removing effects on gramineous weeds in rice fields, also has obvious preventing and removing effects on ryegrass and beckmannia syzigachne in wheat fields, is suitable for preventing and removing weeds in crop rotation fields, and has the characteristics of wide weed control spectrum, good preventing and removing effects, safety and harmlessness.

Description

Weeding composition containing clethodim and bixlone

Technical Field

The invention belongs to the technical field of agricultural compositions, relates to a herbicide, and particularly relates to a herbicide composition containing clethodim and bixlazone.

Background

The farmland weeds are plants which grow in dry farmland, paddy field, roadside, side of the land and the open land around the courtyard, have direct or indirect harm to agricultural production, are urgently required to be eradicated and are not artificially and intentionally cultivated. With the continuous improvement of agricultural production level, farmland weeds become one of important factors influencing the agricultural production development. According to FAO statistics of United nations, economic loss caused by weed harm reaches $ 201 hundred million each year around the world, and economic loss caused by weeds accounts for about 10-15% each year in China. Therefore, in order to ensure the smooth development of agricultural production, the weeds must be scientifically controlled, and a safe, effective and economic herbicide is selected to solve the harm of the weeds in the rice field.

Cycloxydim (English name: profoxdim) is a cyclohexene herbicide developed by basf, and is mostly used for dry field weeding, and the cloxydim is the only paddy field herbicide discovered at present. The cycloprione is mainly used for preventing and killing gramineous weeds in rice fields, such as barnyard grass, cymbopogon, large crabgrass, moleplant seeds, green bristlegrass herb, cudweed and the like, and is safe to direct-seeded rice and transplanted rice.

bixlone is a pigment-inhibiting preemergence herbicide, and inhibits the generation of chlorophyll and chlorophyll-protecting pigment in plants, so that the plants die in a short time. bixlazone is a specific pesticide for preventing and removing ryegrass, and can also be used for preventing and removing other various gramineae and dicotyledonous weeds, such as beckmannia syzigachne, sonchus arvensis, polygonum aviculare and the like. It is also unusual in that it is the only herbicide that can be used for 3 major winter crops (wheat, barley and oilseed rape) and provides greater flexibility for farmers in crop rotation. The mechanism of action of Bixlozone is by inhibiting the action of 1-deoxy-D-xylulose 5-phosphate synthase, thereby disrupting plastid isoprenoid biosynthesis, i.e., carotenoid synthesis. Carotenoids protect chlorophyll in plant cells and contribute to the plant's photosynthetic process. When the carotenoid loses its protective function, the leaves of the plant will turn white. Susceptible weeds cannot metabolize bixlone and eventually cannot photosynthesize and die, while tolerant crops metabolize bixlone to continue growing.

The cycloxydim has excellent control effect on some gramineous weeds such as barnyard grass, moleplant seeds and the like, but basically has no effect on weeds such as secale, Ixeris denticulata and the like, has single weeding spectrum, and has certain limitation on farmland weed control. The combined or combined use of a plurality of herbicides is a leading trend in the future, and the combined use of the herbicides can expand the weed control spectrum and improve the weeding effect. At present, some documents also describe the combination of the topramezone and other herbicides. For example, patent CN201811297186.6 discloses a herbicidal composition containing propanil and clethodim and its application, the active ingredients of the composition comprise quinolines, propanil and sulfonylureas, and the composition can be used for controlling annual gramineous weeds, broadleaf weeds and sedges in rice, and has the characteristics of high utilization rate of the agent and wide herbicidal spectrum. Patent CN108338172A discloses a weeding composition containing clethodim and clomazone and application thereof, wherein the weeding composition takes the clethodim and the clomazone as main active ingredients, delays weed resistance on the premise of improving pesticide effect compared with a single agent, and has the characteristics of wide weeding spectrum and long lasting period.

Through literature retrieval, no report is found in the existing case of compounding and using the clethodim and the bixlone, and on the premise of non-invasive verification of compounding and synergistic data, common technicians in the field are difficult to know, and what weeding effect can be generated by the combined use of the two herbicides.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to provide a herbicidal composition comprising a blend of clethodim and bixlone, and to intensively study the control effect of the composition on weeds.

The active components of the weeding composition comprise clethodim and bixlone, and the mass ratio of the clethodim to the bixlone in the weeding composition is 10: 1-1: 10.

One of ordinary skill in the art will readily recognize that the combined or joint use of multiple pesticides is the leading trend in the future pesticide market, but it is unpredictable whether synergistic effects can be produced between the pesticide active ingredients in the case where the mechanism and mechanism of the components in the pesticide composition are unknown. The inventor determines the toxicity of common weeds such as barnyard grass and beckmark grass in paddy fields and wheat fields by a co-toxicity coefficient method, and the topramezone and the bixlone are mixed according to the mass ratio of 10: 1-1: 10 to show the synergistic effect. Particularly, when the mass ratio of the clethodim to the bixlone is 3: 1-1: 3, the synergistic effect is stable, and the synergistic degree is obvious.

Furthermore, the invention provides a weeding composition containing the clethodim and the bixlone, wherein the mass ratio of the active components of the clethodim to the bixlone in the composition is 3: 1-1: 3.

One of ordinary skill in the art will readily recognize that in order to fully exert the efficacy of the pesticidal active ingredient, it may be formulated into a dosage form convenient for application as desired. Based on the herbicide composition, the invention provides a herbicide composition taking the clethodim and the bixlone as active components and a preparation formulation processed into an agriculturally acceptable form, wherein the preparation components comprise an auxiliary agent or a carrier for assisting the drug effects of the clethodim and the bixlone. When the above different formulations are prepared, it is necessary for those skilled in the art to select various adjuvants besides the selected herbicidal active ingredients, and different auxiliary ingredients (adjuvants) of the pesticide preparation can be selected and used according to the needs. The auxiliary component can be one or more of a dispersing medium, a dispersing agent, an emulsifying agent, a wetting agent, a thickening agent, a pH buffering agent, a defoaming agent, an antifreezing agent, a disintegrating agent, a binder, a filler, a carrier and the like.

In addition, the invention also provides application of the weeding composition containing the clethodim and the bixlone in the field weed control, mainly used for controlling weeds in rice fields, and also has certain control effect on weeds in wheat fields under crop conditions. As described above, the herbicidal composition has an excellent herbicidal effect in a suitable dosage range, and is useful for controlling grassy weeds, broadleaf weeds, sedge weeds, and the like. The herbicide composition and the preparation thereof have various application modes, the invention is not particularly limited, and one or a combination of various application modes such as spraying, root irrigation, broadcasting, furrow application, hole application and the like can be adopted.

Compared with the prior art, the weeding composition has the following beneficial effects or advantages:

the invention provides a herbicide composition containing clethodim and bixlone, and the active components of the herbicide composition contain clethodim and bixlone. The tests of the inventor prove that the mass ratio of the clethodim to the bixlazone in the weeding composition is 10: 1-1: 10. The test of the inventor proves that in the mixture ratio range, the composition has obvious preventing and removing effects on gramineous weeds, broad-leaved weeds and cyperaceae weeds in rice fields, has high preventing and removing effects on ryegrass and beckmannia syzigachne in wheat fields, and is suitable for rotamasa

The weeding composition has the characteristics of wide weed control spectrum, good weeding effect, safety and harmlessness.

Detailed Description

The following examples are given to illustrate the technical aspects of the present invention, but the present invention is not limited to the following examples.

Example 1

This example provides for the preparation of a 30% suspension of clethodim bixlone.

The suspension comprises, by mass, 15 parts of propanil clethodim, 15 parts of bixlone, 5 parts of calcium dodecyl benzene sulfonate, 3 parts of lignosulfonate, 20 parts of dibutyl phthalate, 0.5 part of butanol, 0.8 part of polyvinyl alcohol and 40.7 parts of sterile water per 100 parts of clethodim and bixlone suspending agent.

Weighing the components according to the mass parts, adding the clethodim, the bixlone, calcium dodecyl benzene sulfonate, lignosulfonate, butanol and polyvinyl alcohol into a frosted kettle, grinding to a certain fineness, transferring the materials into a stirring kettle, adding the rest dibutyl phthalate and sterile water, and fully and uniformly mixing to obtain the 30% clethodim-bixlone suspending agent.

Example 2

This example provides for the preparation of a 30% emulsifiable concentrate of clethodim bixlone.

The 100 parts of propanil-clethodim emulsifiable concentrate comprises, by mass, 20 parts of clethodim, 10 parts of bixlone, 400#15 parts of agricultural emulsion, 35 parts of N-methyl pyrrolidone, 17.5 parts of industrial vegetable oil and 2.5 parts of epichlorohydrin.

Weighing the components according to the mass parts, adding the bixlone and the clethodim into the N-methyl pyrrolidone, uniformly mixing, sequentially adding the industrial vegetable oil, the agricultural emulsion 400# and the epichlorohydrin, and uniformly stirring to form a uniform and transparent oily liquid, namely the 30% cycloxydim and bixlone missible oil.

Example 3

This example provides the preparation of 30% clethodim bixlone water dispersible granules.

The clethodim-bixlone water dispersible granule comprises, by mass, 10 parts of clethodim, 20 parts of bixlone, 2 parts of ligneous carbon sulfonate, 3 parts of sodium dodecyl sulfate, 5 parts of sodium sulfate, 5 parts of polyethylene glycol and 55 parts of kaolin per 100 parts of clethodim-bixlone water dispersible granule.

Weighing the components according to the mass parts, adding the materials into a stirrer to be uniformly mixed, then crushing the materials by a jet mill, sieving the materials by a 600-mesh standard sieve, adding the materials into a kneader to be kneaded into plastic materials, finally putting the plastic materials into an extrusion granulator to be extruded and granulated, and drying and sieving the granules to obtain the 30% of clethodim bixozone water dispersible granule.

Example 4

This example provides the preparation of a 30% wettable powder of clethodim bixlone.

The clethodim-bixlone water dispersible granule comprises, by mass, 18 parts of clethodim, 12 parts of bixlone, 4 parts of polyoxyethylene polyoxypropylene ether block copolymer, 3 parts of sodium dodecyl sulfate and 63 parts of white carbon black per 100 parts of clethodim-bixlone water dispersible granule.

Weighing the components according to the mass parts, adding the materials into a stirrer, uniformly mixing, crushing by a jet mill, and sieving by a 600-mesh standard sieve to obtain the 30% amicarbazone bixlone wettable powder.

Example 5

This example provides an indoor virulence assay for the herbicidal composition comprising propanil and clethodim.

The method comprises the steps of carrying out tests according to the mass ratio of the effective components of the clethodim to the bixlone of 15: 1-1: 15, preparing required test agents, and measuring the co-toxicity coefficient of the test agents on common rice weeds such as barnyard grass and monochoria vaginalis as shown in Table 1.

Respectively sowing quantitative weed seeds in planting pots (the upper caliber is 120mm, the bottom diameter is 85mm, and the height is 150mm), sowing 20 seeds in each pot, culturing in a phytotron for plant growth, and spraying the test agent when 4-leaf stage of weeds is reached. The cultivation is continued in the greenhouse after the spraying treatment, and the weed control effect of each treatment is regularly observed. The fresh weight of each treated weed was weighed at 25d and the ED50 and co-toxicity coefficient were calculated from its virulence regression curve. When the co-toxicity coefficient is larger than 120, the two effective substances have a synergistic effect, the co-toxicity coefficient is between 80 and 120, the two effective substances have an additive effect, and the co-toxicity coefficient is smaller than 80, so that the good total effective substances have an antagonistic effect. The measurement results are shown in table 1.

TABLE 1 indoor virulence determination for barnyard grass with a herbicidal composition comprising clethodim and bixlazone

The results in table 1 show that when the mass ratio of the clethodim to the bixlone in the weeding composition is 10: 1-1: 10, the cotoxicity coefficient is greater than 120, and the results show that the clethodim and the bixlone have a synergistic effect on preventing and killing barnyard grass within the ratio range. Preferably, when the mass ratio of the clethodim to the clethodim is 3: 1-1: 3, the co-toxicity coefficient is highest, and the synergistic effect is most stable.

TABLE 2 indoor virulence determination of beckmelone and bixlone herbicidal compositions containing beckmelone against beckmannia syzigachne

The results in table 2 show that when the mass ratio of the clethodim to the bixlone in the weeding composition is 10: 1-1: 10, the co-toxicity coefficient is greater than 120, and that the clethodim and the bixlone have a synergistic effect on control of beckmannia in the ratio range. Preferably, when the mass ratio of the clethodim to the bixlone is 3: 1-1: 3, the cotoxicity coefficient is highest, and the synergistic effect is most stable.

Example 6

The present example provides a study on the control effect of the herbicidal composition containing clethodim and bixlone on gramineous weeds, broadleaf weeds and sedge weeds in paddy fields.

The test site is selected in a farmland in Nanchang county, Nanchang city, Jiangxi province, the soil fertility is moderate, the terrain is flat, the irrigation and drainage are convenient, and main weeds in the farmland comprise barnyard grass, monochoria vaginalis, moleplant seed, rhizoma pleionis, herba arthrodii, alternanthera philoxeroides, cyperus rotundus, polygonum syringae and the like.

The agent used in this example was 10% clethodim bixlone suspending agent, wherein the mass ratio of propanil to clethodim in the composition was 1: 1. In order to fully exert the test effect of the effective components, other auxiliary agents are required to be added, and the auxiliary agents comprise an emulsifier, a wetting agent, a thickening agent, an antifoaming agent and a carrier. Specifically, each 100 parts of the suspension agent composition comprises, by mass, 5 parts of clethodim, 5 parts of bixlozone, 4 parts of emulsifier castor oil polyoxyethylene ether, 3 parts of wetting agent sodium lauryl sulfate, 0.5 part of thickener xanthan gum, 0.3 part of defoamer polydimethylsiloxane and 82.2 parts of sterile water.

The preparation method of the suspending agent comprises the following steps: adding the clethodim, the bixlone, the wetting agent, the thickening agent, the defoaming agent, part of the emulsifying agent and part of the carrier into a sanding kettle according to the formula, grinding to a certain fineness, transferring the materials into a stirring kettle, adding the rest emulsifying agent and the rest carrier, and fully and uniformly mixing to obtain the 10% clethodim-bixlone suspending agent.

The 10% clethodim-bixlone suspending agent prepared by the method is used as a test medicament, the 10% clethodim suspending agent and the 10% bixlone suspending agent are used as control treatment medicaments, and clear water is used as a blank Control (CK). The drug gradient settings for the mixed treatment and control treatment are shown in table 3.

And (3) draining a water layer in the field at the 3-5 leaf stage of the weeds, and spraying the pesticide by using a knapsack sprayer. 30m per cell processed²Each treatment was repeated 3 times. Investigating weed growth condition at 40d after application, selecting 5 points per plot according to Z shape, each point being 1m²And checking the weed species and the residual plant number in the sampling points, and calculating the plant control effect. The leaf color, leaf shape and growth of the rice were observed at irregular intervals after application to confirm the safety of the herbicide to the rice, and the data of the results are shown in table 3.

The prevention effect calculation method comprises the following steps:

fresh weight control effect (%) - (control area fresh weight-application area fresh weight)/control area fresh weight) x100

TABLE 3 herbicidal Effect of 10% suspension of Bixaflutole bixlone on direct-seeded Rice fields

As can be seen from the data in Table 3, after the herbicide is applied for 40 days, each treatment agent has poor control effect on broadleaf weeds and sedge weeds, but has remarkable control effect on gramineous weeds. The 10% clethodim-bixlone suspending agent prepared by mixing the bixlone and the clethodim has obvious control effect on gramineous weeds. The effect is obviously better than the effect of using single dose or additive dose of the clethodim and the bixlone, which shows that the combination of the clethodim and the bixlone has synergistic effect.

Example 7

One of ordinary skill in the art will appreciate that different crops often have their own associated or parasitic weeds that require substantially the same ecological environmental conditions as the crop. The lolium multiflorum is the associated weed of wheat, and is serious when the wheat is continuously planted; the ecological environment required by the weeds such as barnyard grass, abnormal sand grass and the like is similar to that of the rice, and becomes the accompanying weeds of the rice. Therefore, the ecological environment of the weeds can be changed by carrying out crop rotation and stubble replacement, the growth environment which is not beneficial to the weeds is created, and the harm of the growth environment is reduced.

In the embodiment, the composition of the invention is used for preventing and killing weeds in crop rotation wheat fields, and the effect of preventing and killing weeds in the wheat fields and the safety of wheat growth are researched. The test site is selected in the persistent city of Jiangsu province, the water and fertilizer management is normal, the previous crops are rice, and the harm of weeds is serious. The main weeds in the crop rotation wheat field comprise perennial ryegrass, beckmannia syzigachne and alopecurus davidii, and the weeds of previous-stubble paddy.

The test agent used in this example was the 30% wettable powder of clethodim bixlone described in example 4, and the 30% wettable powder of clethodim bixlone was applied to weeds at 3-6And spraying the powder by using a knapsack small sprayer after the powder is diluted by adding water. 4 treatments are respectively set, the dosage of each treatment is shown in table 4, and each treatment cell is 30m²Each treatment was repeated 3 times. Investigating weed growth condition at 20d after application, selecting 5 points in each plot according to Z shape, each point being 1m²The weed species and the number of residual strains in the spot were checked and the control effect of the strain was calculated (the calculation method was the same as in example 6). The leaf color, leaf shape and growth of wheat were observed at irregular intervals after application to confirm the safety of the herbicide to wheat, and the data of the results are shown in Table 4.

TABLE 4, effect of 30% wettable powder of amicarbazone bixlone on weed control in wheat field

The results in table 4 show that the composition has a high content of over 95% of the weed rye grass in the wheat field and is excellent when rice-wheat crop rotation is adopted and the 30% of the wettable powder of the clethodim and the bixlazone is further used. The control effect on beckmannia syzigachne is over 90 percent, and the beckmelon sycamara has obvious control effect on physcombean syzygium, and the control rate can be over 80 percent under a certain using dose. The observation of the growth condition of the wheat by the inventor shows that the wheat has no abnormal growth condition. By combining the results of example 6, the inventors actually observe that the composition of clethodim and bixlone provided by the invention is safe for the growth of rice and wheat, and has no growth inhibition, dwarfing and yield reduction.

As described above, the present invention can be preferably implemented, and the above-mentioned embodiments only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various changes and modifications of the technical solution of the present invention made by those skilled in the art without departing from the design spirit of the present invention shall fall within the protection scope defined by the present invention.

Claims

1. The weeding composition containing the clethodim and the bixlone is characterized in that active components of the weeding composition contain the clethodim and the bixlone, and the mass ratio of the clethodim to the bixlone in the weeding composition is 10: 1-1: 10.

2. The weeding composition according to claim 1, wherein the mass ratio of the clethodim to the bixlone in the weeding composition is 3: 1-1: 3.

3. Use of the herbicidal composition according to claim 1 or 2 for controlling weeds in agricultural fields.

4. The use according to claim 3, wherein the herbicidal composition is used for controlling paddy field weeds.

5. Use according to claim 3, characterized in that the herbicidal composition is used for controlling weeds in wheat fields.

6. Use according to claim 3, wherein the weeds comprise grasses, broadleaf weeds and sedges.