Broad-leaf closed weeding composition for soybean field and application of broad-leaf closed weeding composition

Abstract

The invention provides a broad-leaf closed weeding composition for a soybean field. The active ingredients of the broad-leaf closed weeding composition are metribuzin, flumioxazin and oxadiazon. The invention further provides application of the weeding composition for broad-leaf closed weeding in soybean fields. The broad-leaf closed weeding composition for the soybean field is applied in front of soybean seedlings, closed one-time weeding is achieved, broad-leaf weeds in the soybean field are basically eliminated, and secondary pesticide application after seedling is not needed; the lasting period on weeds is prolonged, the pesticide application frequency is reduced, and the labor cost is reduced; phytotoxicity in the seedling stage of the soybeans due to the use of broad-leaf herbicides after the soybean seedlings is avoided, namely, the growth period of the soybeans is prolonged by more than 10 days, and the yield of the soybeans is correspondingly increased by more than 15%; the threat of broad-leaf weeds in the whole growth period of soybeans can be covered by one-time pesticide application, and the requirement for repeated pesticide application is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of herbicides, and in particular relates to a soybean field broadleaf closed weed control composition and application thereof. Background Art

[0002] In the main soybean producing areas, continuous soybean planting and unreasonable crop rotation are serious. After years of soybean planting, Amaranth (commonly known as red-root Amaranth) has become the dominant weed community in soybean fields. It has changed from an easily preventable weed to a malignant weed. In addition, the weed base in the field is very large. In some plots, the base of red-root Amaranth is as high as several hundred plants per square meter, which is particularly difficult to prevent and control. According to surveys, Amaranth is the most troublesome weed for farmers in most soybean producing areas in Heilongjiang Province, the Russian Far East, and even in the soybean producing areas of Inner Mongolia. Post-emergence broadleaf herbicides such as clomazone, amitraz, bentazon, and acifluorfen have increased the resistance of weeds such as amaranth, and the control effect is very limited. Only amitraz and acifluorfen are effective for amaranth in the newly emerged stage. There are almost no effective pesticides for red-rooted amaranth that emerges later. Farmers apply 25% amitraz at a dosage of up to 10-12 kg / hectare, but it is not effective. In addition, the pesticide damage to soybeans is particularly serious. Before the soybeans recover from the pesticide damage, amaranth has already resumed normal growth. In the later stage, growers can only pull them out manually, wasting a lot of manpower, material resources, and financial resources, greatly increasing the planting cost. Therefore, we can only start with closed weeding before soybean seedlings and new pesticide ratios. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a soybean field broadleaf closed weeding composition and its application in view of the deficiencies of the above-mentioned prior art. The soybean field broadleaf closed weeding composition is applied before soybean seedlings to achieve closed one-time weeding, which basically solves the broadleaf weeds in the soybean field without the need for secondary application after seedlings; the effective period on weeds is extended, the number of applications is reduced, the labor cost is reduced, and no pesticide damage to soybeans in the seedling stage will be caused by the reuse of soybean post-seedling broadleaf herbicides, which is equivalent to an increase of more than 10 days in the soybean growth period, and the soybean yield is correspondingly increased by more than 15%; one application can cover the threat of broadleaf weeds in the entire soybean growth period, reducing the need for repeated application.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a soybean field broadleaf closed herbicide composition, wherein the active ingredients of the soybean field broadleaf closed herbicide composition are metribuzin, fluazifop-propyl and oxadiazon.

[0005] Preferably, the soybean field broadleaf closed herbicidal composition is a preparation prepared by adding auxiliary ingredients to the active ingredients of metribuzin, fluazifop-propyl and oxadiazon.

[0006] Preferably, the auxiliary components include a carrier and an auxiliary agent, the carrier is at least one of water, a solvent and a filler, and the auxiliary agent includes at least one surfactant.

[0007] Preferably, the dosage form of the preparation includes a suspending agent, an oil suspending agent, a microcapsule agent or a microcapsule suspension-suspending agent.

[0008] Preferably, the broadleaf closed weeding composition for soybean fields is a mixture of metribuzin wettable powder, flumioxazin wettable powder and oxadiazon emulsifiable concentrate.

[0009] Preferably, the dosage of the active ingredient of the metribuzin wettable powder in the broadleaf closed weeding composition for soybean fields is 175 g / ha, the dosage of the active ingredient of the flumioxazin wettable powder is 20 g / ha, and the dosage of the active ingredient of the oxadiazon emulsifiable concentrate is 375 g / ha.

[0010] The present invention also provides the application of the above-mentioned broadleaf closed weeding composition for soybean fields, and the broadleaf closed weeding composition for soybean fields is used for broadleaf closed weeding in soybean fields.

[0011] Preferably, the broadleaf closed weeding composition for soybean fields is sprayed on the soil once 2 - 3 days before the emergence of soybean seedlings.

[0012] Preferably, the weeds in the soybean fields include annual broadleaf weeds: Chenopodium album, Polygonum spp., Fallopia convolvulus, Solanum nigrum, Galeopsis bifida, Abutilon theophrasti, Elsholtzia ciliata, Commelina communis, Xanthium sibiricum; and also include perennial broadleaf weeds: Equisetum arvense, Sonchus arvensis, Cirsium setosum, Calystegia hederacea.

[0013] The present invention has the following advantages compared with the prior art: The broadleaf closed weeding composition for soybean fields of the present invention is applied before the emergence of soybean seedlings, achieving one-time closed weeding, basically solving the problem of broadleaf weeds in soybean fields, eliminating the need for secondary post-seedling application; extending the effective period against weeds, reducing the number of application times, reducing labor costs, and not causing phytotoxicity to soybean seedlings during the seedling stage due to the reuse of broadleaf herbicides after soybean seedlings, which is equivalent to increasing the growth period of soybeans by more than 10 days, and the soybean yield also increases by more than 15% accordingly; one-time application can cover the threat of broadleaf weeds throughout the growth period of soybeans, reducing the need for repeated application.

[0014] The following further elaborates the present invention with reference to examples. Specific Embodiments

[0015] Example 1 The broadleaf closed weeding composition for soybean fields in this example is a mixture of 70% metribuzin wettable powder, 50% flumioxazin wettable powder and 250 g / L oxadiazon emulsifiable concentrate.

[0016] In the broadleaf closed weeding composition for soybean fields, the dosage of the active ingredient in the quizalofop-p-ethyl wettable powder is 175 g / ha, the dosage of the active ingredient in the flumioxazin wettable powder is 20 g / ha, and the dosage of the active ingredient in the oxadiazon emulsifiable concentrate is 375 g / ha.

[0017] This broadleaf closed weeding composition for soybean fields is used for broadleaf closed weeding in soybean fields, and the soil is sprayed once 2 - 3 days before the emergence of soybean seedlings.

[0018] The 70% quizalofop-p-ethyl wettable powder is commercially available and purchased from Xingnong Pesticide Industry (China) Co., Ltd.; The 50% flumioxazin wettable powder is commercially available and purchased from Zhejiang Tianfeng Bioscience Co., Ltd. at HYPERLINK "https: / / www.icama.cn / BasicdataSystem / pesticideRegistration / queryselect.do" The 250 g / L oxadiazon emulsifiable concentrate is commercially available and purchased from Jiangsu Longdeng Chemical Co., Ltd.; The broadleaf closed weeding composition for soybean fields in this example can control the vast majority of weeds in soybean fields, such as annual weeds like amaranth, Chenopodium album, Polygonum, buckwheat vine, Solanum nigrum, Galeopsis bifida, Abutilon theophrasti, Elsholtzia ciliata, Commelina communis, Xanthium sibiricum, etc., and has a strong inhibitory effect on perennial broadleaf weeds such as Equisetum arvense, Sonchus arvensis, Cirsium setosum, Calystegia hederacea.

[0019] The following is the field application situation of the broadleaf closed weeding composition for soybean fields in this example: (I) Test location: Baoyan Village, Longhe Town, Nehe City. The test plot area is 300 mu and it is continuously used for 3 years (from 2022 to 2024).

[0020] In 2022, the dosage of the active ingredient in the 70% quizalofop-p-ethyl wettable powder was 175 g / ha + the dosage of the active ingredient in the 48% clomazone emulsifiable concentrate was 360 g / ha. The control effect on most annual broadleaf weeds was ideal and it was safe for soybeans, but there were still some amaranth growing later and a small amount of manual weeding was needed.

[0021] In the second year, the dosage of the active ingredient in the 70% quizalofop-p-ethyl wettable powder was 175 g / ha + the dosage of the active ingredient in the 50% flumioxazin wettable powder was 20 g / ha + the dosage of the active ingredient in the 250 g / L oxadiazon emulsifiable concentrate was 250 g / ha. The effect on most annual broadleaf weeds was relatively ideal and it was safe for soybeans, but there were still a small number of amaranth in the later stage, and the effect was much better than the previous year.

[0022] In the third year of using the broadleaf closed weeding composition for soybean fields, the dosage of the active ingredient of 70% metribuzin wettable powder is 175 g / ha, the dosage of the active ingredient of 50% flumioxazin wettable powder is 20 g / ha, and the dosage of the active ingredient of 250 g / L oxadiazon emulsifiable concentrate is 375 g / ha (i.e., the formula of this example). The effect on most annual broadleaf weeds is very ideal. The control effect of field weeds in the rotation plot can reach more than 98%, which is safe for soybeans. There are almost no field weeds in the later stage. The control effect of field weeds in the continuous cropping plot can reach more than 90%, and there are only sporadic weeds in the field in the later stage.

[0023] In addition, 81.5% acetochlor emulsifiable concentrate with an active ingredient dosage of 138.6 g / ha is applied simultaneously to control gramineous weeds in the field.

[0024] (2) Test location: Laolai Farm, Nehe. The test plot area is 150 mu, and the test year is 2024. Soybeans have been continuously cropped for many years, with almost no rotation, and the damage of Amaranthus retroflexus is serious.

[0025] In the broadleaf closed weeding composition for soybean fields, the dosage of the active ingredient of 70% metribuzin wettable powder is 175 g / ha, the dosage of the active ingredient of 50% flumioxazin wettable powder is 20 g / ha, and the dosage of the active ingredient of 250 g / L oxadiazon emulsifiable concentrate is 375 g / ha (i.e., the formula of this example). After the emergence of soybeans, it is safe for soybeans, and the control effect on annual broadleaf weeds reaches more than 92%. There are almost no annual broadleaf weeds in the later stage, and only some small amounts of perennial weeds remain in the field and their growth is severely inhibited.

[0026] In addition, 81.5% acetochlor emulsifiable concentrate with an active ingredient dosage of 138.6 g / ha is applied simultaneously to control gramineous weeds in the field.

[0027] (3) Test location: Nenjiang City. The test plot area is 300 mu, and the test year is 2024. Soybeans have been continuously cropped for many years, with almost no rotation, and the damage of Amaranthus retroflexus is serious.

[0028] Using 70% metribuzin wettable powder with an active ingredient dosage of 175 g / ha + 50% flumioxazin wettable powder with an active ingredient dosage of 20 g / ha + 250 g / L oxadiazon emulsifiable concentrate with an active ingredient dosage of 375 g / ha (i.e., the formula of this example). After the emergence of soybeans, it is safe for soybeans, and the control effect on annual broadleaf weeds reaches more than 91%.

[0029] In addition, 81.5% acetochlor emulsifiable concentrate with an active ingredient dosage of 138.6 g / ha is applied to control gramineous weeds in the field.

[0030] (4) Test site: Keshan Farm, with a test plot area of 120 mu and the test year of 2024. The dosage of the active ingredient of 70% metribuzin wettable powder is 175 g / ha + the dosage of the active ingredient of 50% flumioxazin wettable powder is 20 g / ha + the dosage of the active ingredient of 250 g / L oxadiazon emulsifiable concentrate is 375 g / ha (i.e., the formula of this example). It is safe for soybeans after emergence, and the control effect on annual broadleaf weeds reaches over 96%.

[0031] In addition, 81.5% acetochlor emulsifiable concentrate with an active ingredient dosage of 138.6 g / ha was applied simultaneously to control gramineous weeds in the field.

[0032] (5) Test site: Zhai Li, Liming Village, Liuhe Town, Nehe City, with a test plot area of 75 mu and the test year of 2024. The dosage of the active ingredient of 70% metribuzin wettable powder is 175 g / ha + the dosage of the active ingredient of 50% flumioxazin wettable powder is 20 g / ha + the dosage of the active ingredient of 250 g / L oxadiazon emulsifiable concentrate is 375 g / ha (i.e., the formula of this example). It is safe for soybeans after emergence, has a long weed control period in the field, and the control effect on annual broadleaf weeds reaches over 93%.

[0033] In addition, 81.5% acetochlor emulsifiable concentrate with an active ingredient dosage of 138.6 g / ha was applied simultaneously to control gramineous weeds in the field.

[0034] The broadleaf closed weeding composition for soybean fields of the present invention is applied before soybean emergence for one-time closed weeding, basically solving the problem of broadleaf weeds in soybean fields without the need for secondary post-emergence spraying; it prolongs the weed control duration, reduces the number of spraying times, reduces labor costs, and does not cause phytotoxicity to soybean seedlings due to the reuse of post-emergence broadleaf herbicides for soybeans, which is equivalent to increasing the soybean growth period by more than 10 days, and the soybean yield also increases by more than 15% accordingly; one spraying can cover the threat of broadleaf weeds throughout the soybean growth period and reduce the need for repeated spraying.

[0035] The broadleaf closed weeding composition for soybean fields of the present invention can solve the long-term problem of red-root amaranth in soybean fields; the control effect in soybean-corn rotation plots reaches over 98%, and the control effect in continuous soybean plots reaches over 90%. It expands the weed control spectrum, covers more weeds, and the three have complementary action mechanisms. It can concurrently control annual broadleaf weeds such as Chenopodium album, Polygonum spp., Convolvulus arvensis, Capsella bursa-pastoris, Commelina communis, Xanthium sibiricum, etc.; at the same time, it has a strong inhibitory effect on perennial weeds such as Equisetum arvense, Sonchus arvensis, Cirsium setosum, Calystegia hederacea, etc.; the risk of missed control is less. The broadleaf closed weeding composition for soybean fields of the present invention is safe for soybeans and highly effective against weeds; by scientific proportioning, the dosage of single agents is reduced, the risk of phytotoxicity to soybeans is reduced, and the selectivity is enhanced; the dosage is reduced, the soil residue is reduced, the impact on sensitive crops in the following season (such as corn, vegetables) is reduced, and the environmental friendliness is enhanced.

[0036] Since post-emergence herbicides are no longer used, there is no pesticide damage to soybean seedlings, and there is no 7-10 days of seedling acclimatization period, which is equivalent to extending the growth period of soybeans by 7-10 days, which increases soybean yield and promotes early maturity. The soybean field broadleaf closed weed control composition of the present invention has significant economic benefits: efficient weed control, reducing competition between weeds and soybeans for light, water and nutrients, promoting healthy growth of soybeans, and being able to increase yield by more than 15%; reducing the single and total amount of the agent and the number of times of application, reducing the labor, machinery and agent costs, saving costs and increasing efficiency. Almost all common annual broadleaf weeds in soybean fields are controlled, with a control effect of more than 95% and a lasting effect of more than 30 days. Post-emergence broadleaf herbicides are almost no longer used. If the rain is frequent, a grass herbicide may need to be sprayed once in the later stage.

[0037] The application time of the broadleaf closed herbicide composition for soybean fields of the present invention is: spraying 2 to 3 days before the seedlings emerge. However, there are exceptions. If there is a light rain in the near future, the closed herbicide should be sprayed before the rain. If there is a heavy rain in the near future, a large amount of rainwater may leach to the buds or roots. It is best to spray the closed herbicide after the rain to prevent leaching damage.

[0038] The amount of liquid to be sprayed depends on the soil moisture conditions at the time. If the soil moisture conditions are good, use an appropriate amount of water; if there is grass growing, use less water; if the weather is dry, use more water. It is best to spray again with clean water when the grass comes out. The best time to apply the pesticide is at night when the wind is small and the evaporation is small.

[0039] Choose windless or breezy weather to apply enclosed herbicides, and stop working during high temperature periods; it is best to use a windproof nozzle to spray enclosed herbicides, apply the medicine at night, and rest during the day.

[0040] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A broadleaf closed weeding composition for soybean fields, characterized in that, The active ingredients of the broadleaf closed weeding composition for soybean fields are metribuzin, flumioxazin, and oxadiazon.

2. The broadleaf closed weeding composition for soybean fields according to claim 1, characterized in that, The broadleaf closed weeding composition for soybean fields is a mixture of metribuzin wettable powder, flumioxazin wettable powder, and oxadiazon emulsifiable concentrate.

3. The broad-leaved closed weeding composition for soybean fields according to claim 2, wherein, In the broadleaf closed weeding composition for soybean fields, the application rate of the active ingredient of the metribuzin wettable powder is 175 g / ha, the application rate of the active ingredient of the flumioxazin wettable powder is 20 g / ha, and the application rate of the active ingredient of the oxadiazon emulsifiable concentrate is 375 g / ha.

4. Use of a broadleaf closed weeding composition for soybean fields as described in any one of claims 1-3, characterized in that, The broadleaf closed weeding composition for soybean fields is used for broadleaf closed weeding in soybean fields.

5. The application according to claim 4, wherein The broadleaf closed weeding composition for soybean fields is sprayed on the soil once 2 - 3 days before the emergence of soybean seedlings.