Weeding composition, weeding method and application

Abstract

The invention provides a weeding composition, a weeding method and application, and belongs to the technical field of herbicides. The weeding composition provided by the invention comprises imazethapyr and an auxiliary agent, the auxiliary agent is betaine and / or a betaine derivative; the mass ratio of the imazethapyr to the auxiliary agent is 1: (0.5-1.5). The imazethapyr is used as an effective component, and the betaine and / or the derivative thereof are / is used as auxiliaries to jointly treat weeds, so that the purpose of efficiently removing the weeds can be achieved. And the betaine and / or the derivative thereof belong to plant source substances, are easy to obtain and environment-friendly, and can effectively reduce residual poison caused in the application process of the weeding composition.

Description

Technical Field

[0001] The invention belongs to the technical field of herbicides, and in particular relates to a herbicidal composition, a weeding method and an application thereof. Background Art

[0002] There are many weeds in rice fields, soybean fields, sugarcane fields, corn fields, rapeseed fields, tea gardens and other farmlands and non-cultivated land. Weed damage will cause crop yield reduction, resulting in economic losses. Therefore, weed control has become one of the important tasks to promote agricultural development. At present, herbicides are limited by safety and weed control spectrum. Using a single herbicide alone cannot completely and effectively control the occurrence of weeds in the field. Moreover, some herbicides are prone to residual toxicity due to their high water solubility, long field duration, excessive dosage or uneven application.

[0003] Imidazole, also known as imidazopyrine in Chinese, has a chemical name of 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid, which is mainly used to control numerous annual and perennial grass weeds and broadleaf weeds. Therefore, due to the unsatisfactory effect on old weeds during the use of single-variety preparations of imidazopyrine, and the problem of easy phytotoxicity to a variety of economic crops, there is a need to find a herbicide composition used in combination with imidazopyrine for effective weed control. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a herbicidal composition, a weeding method and an application.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a herbicidal composition, which comprises imazethapyr and an adjuvant;

[0007] The auxiliary agent is betaine and / or a betaine derivative;

[0008] The mass ratio of the imidazolin to the auxiliary agent is 1:0.5-1.5.

[0009] Preferably, the betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyltetradecyldimethylammonium, 3-sulfopropylhexadecyldimethylammonium, cocamidopropyl dimethylamine betaine and n-dodecyl-N,N-dimethylglycine.

[0010] Preferably, the betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyltetradecyldimethylammonium, 3-sulfopropylhexadecyldimethylammonium and n-dodecyl-N,N-dimethylglycine.

[0011] Preferably, the betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyltetradecyldimethylammonium and 3-sulfopropylhexadecyldimethylammonium.

[0012] Preferably, the betaine derivative includes 3-decyldimethylaminopropane sulfonate.

[0013] Preferably, the betaine derivative includes cocamidopropyl dimethylamino betaine.

[0014] The invention also provides an application of the herbicidal composition in weeding.

[0015] Preferably, the grass includes one or more of Echinochloa crusgalli, Leptochloa chinensis, Digitaria sanguinalis, Lolium multiflorum, Solanum nigrum, Abutilon velutipes and Shepherd's purse.

[0016] The invention also provides a weeding method, which comprises spraying the weeds with the herbicidal composition.

[0017] Preferably, the spraying time is when the weeds have 2 to 3 leaves, the spraying frequency is 1 time, and the dosage of each spraying is 15 g ai / mu of the effective ingredient of imazethapyr.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a herbicidal composition, a method for removing weeds and an application thereof. The present invention uses imazethapyr as an effective ingredient and betaine and / or its derivatives as adjuvants to jointly control weeds, thereby achieving the purpose of efficiently removing weeds. Betaine and / or its derivatives are plant-derived substances, are easy to obtain, and are environmentally friendly, and can effectively reduce the residual toxicity caused by the herbicidal composition during the application process. DETAILED DESCRIPTION

[0020] The present invention provides a herbicidal composition, which comprises imazethapyr and an adjuvant;

[0021] The auxiliary agent is betaine and / or a betaine derivative;

[0022] The mass ratio of the imidazolin to the auxiliary agent is 1:0.5-1.5.

[0023] In the present invention, imidazolin in the herbicidal composition is an effective ingredient for weed control, and the mass ratio of imidazolin to the adjuvant is preferably 1:0.5-1.5, such as 1:0.5, 1:1 or 1:1.5. The betaine derivative includes 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium, 3-sulfopropyl hexadecyldimethylammonium, cocamidopropyl dimethylamine ethyl lactone and n-dodecyl-N,N-dimethylglycine. As a preferred embodiment, the betaine derivative includes 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium, 3-sulfopropyl hexadecyldimethylammonium and n-dodecyl-N,N-dimethylglycine. As one embodiment, the betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium and 3-sulfopropyl hexadecyldimethylammonium. Further preferably, the betaine derivative includes 3-decyldimethylaminopropane sulfonate. The betaine derivative also preferably includes cocamidopropyl dimethylamine ethyl lactone. The present invention does not specifically limit the sources of imidazolyl nicotinic acid, betaine, 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium, 3-sulfopropyl hexadecyldimethylammonium, cocamidopropyl dimethylamine ethyl lactone and n-dodecyl-N, N-dimethylglycine, and can be prepared using commercially available products or known preparation methods in the art.

[0024] The invention also provides an application of the herbicidal composition in weeding.

[0025] The present invention has been found through experiments that the combination of imazethapyr and betaine and / or betaine derivatives can effectively remove weeds, and the weeds preferably include one or more of barnyard grass, lycopodii, crabgrass, multiflora ryegrass, nightshade, ramie and shepherd's purse, more preferably ramie and / or shepherd's purse, and more preferably shepherd's purse.

[0026] The invention also provides a weeding method, which comprises spraying the weeds with the herbicidal composition.

[0027] In the present invention, the spraying time is when the weeds have 2 to 3 leaves, the spraying frequency is 1 time, and the dosage of each spraying is 15 g ai / mu of the effective ingredient of imazethapyr.

[0028] The present invention uses betaine and / or betaine derivatives that are non-toxic to plants as adjuvants for imidacloprid, which can further enhance the weed control effect and reduce residual toxicity to the field or plants compared with using imidacloprid alone, is environmentally friendly, and improves the edible safety of crops.

[0029] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0030] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0031] In the following examples, the test weeds are:

[0032] Poaceae weeds: Echinochloa crus-galli (L.) P.Beauv., Leptochloachinensis (L.) Nees, Digitaria sanguinalis (Linn.) Scop., Lolium multiflorum Lamk.

[0033] Broadleaf weeds: Solanum nigrum L., Abutilon theophrasti Medic, Shepherd's purse [Capsella bursa-pastoris (L.) Medic].

[0034] The trimethylamine glycine salt is also called betaine. The 3-decyldimethylaminopropane sulfonate is also called sulfobetaine 10. The dimethylthioacetic acid is also called sulfobetaine 12. The 3-sulfopropyl tetradecyl dimethyl ammonium is also called sulfopropyl tetradecyl dimethyl betaine. The 3-sulfopropyl hexadecyl dimethyl ammonium is also called sulfopropyl hexadecyl dimethyl betaine. The cocamidopropyl dimethylamine ethyl lactone is also called cocamidopropyl betaine. The n-dodecyl-N,N-dimethylglycine is also called dodecyl dimethyl betaine.

[0035] Example 1

[0036] A herbicidal composition, consisting of the following components:

[0037] Imidazole acetic acid and glycine trimethylamine inner salt, wherein the mass ratio of the imidazole acetic acid and glycine trimethylamine inner salt is 1:1.

[0038] Example 2

[0039] A herbicidal composition, consisting of the following components:

[0040] Imidazole acetic acid and 3-decyl dimethylamino propane sulfonate, wherein the mass ratio of the imidazoline acetic acid and 3-decyl dimethylamino propane sulfonate is 1:1.

[0041] Example 3

[0042] A herbicidal composition, consisting of the following components:

[0043] Imidazole acetic acid and dimethylthioacetic acid, wherein the mass ratio of the imidazole acetic acid to the dimethylthioacetic acid is 1:1.

[0044] Example 4

[0045] A herbicidal composition, consisting of the following components:

[0046] Imidazole acetic acid and 3-sulfopropyl tetradecyl dimethyl ammonium, wherein the mass ratio of the imidazoline acetic acid and 3-sulfopropyl tetradecyl dimethyl ammonium is 1:1.

[0047] Example 5

[0048] A herbicidal composition, consisting of the following components:

[0049] Imidazole acetic acid and 3-sulfopropyl hexadecyl dimethyl ammonium, wherein the mass ratio of the imidazoline acetic acid and 3-sulfopropyl hexadecyl dimethyl ammonium is 1:1.

[0050] Example 6

[0051] A herbicidal composition, consisting of the following components:

[0052] Imidazole acetic acid and cocamidopropyl dimethylamine betaine, wherein the mass ratio of the imidazole acetic acid and cocamidopropyl dimethylamine betaine is 1:1.

[0053] Example 7

[0054] A herbicidal composition, consisting of the following components:

[0055] Imidazole acetyl nicotinic acid and n-dodecyl-N,N-dimethylglycine, wherein the mass ratio of the imidazolin acetyl nicotinic acid to n-dodecyl-N,N-dimethylglycine is 1:1.

[0056] Test Example 1

[0057] 1. Test compound

[0058] Test agent: 98% imidacloprid original drug.

[0059] Control agent: 98% fenpyroxil technical material.

[0060] Types of additives: glycine trimethylamine salt, 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium, 3-sulfopropyl hexadecyldimethylammonium, cocamidopropyl dimethylamine ethyl lactone, n-dodecyl-N,N-dimethylglycine.

[0061] 2. Determination method

[0062] The test was conducted in accordance with the Guidelines for Indoor Bioassay Tests of Pesticides - Herbicides Part 4: Activity Determination Test - Stem-Leaf Spray Method (NY / T 1155.4-2006).

[0063] Pesticide preparation: Accurately weigh the original drug, add appropriate amount of acetone to dissolve it, then add 0.1% Tween 80 to dilute and make a mother solution, and then dilute it step by step to the required concentration according to the dosage requirements of the experimental design.

[0064] Weed cultivation: After germination, sow the seeds of barnyard grass, lycopodium album, crabgrass, multiflora ryegrass, nightshade, velvetleaf, and shepherd's purse in a 15 cm diameter plastic cup filled with nutrient soil, 30 seeds per cup, cover with 20 mesh fine soil to just cover the seeds, soak water from the bottom of the pot to make the soil completely moist, and place in a greenhouse for use. Thin out the weeds when they grow to the 2-leaf stage.

[0065] The nutrient soil is prepared by mixing loam and seedling medium in a volume ratio of 1:1. The seedling medium is prepared by mixing peat, perlite and vermiculite in a volume ratio of 3:1:1.

[0066] Application method:

[0067] The experiment was divided into experimental groups 1 to 7, imazethapyr group and fenpyrazone group, and the treatment methods of each group were as follows:

[0068] When the weeds grow to the 2-3 leaf stage, the herbicidal compositions prepared in Examples 1-7 (experimental groups 1-7), imidacloprid (imidacloprid group), fenpyrazone (fenpyrazone group) and clean water (blank control group) are respectively used for stem and leaf spraying treatment once, and the amount of imidacloprid active ingredient sprayed by the experimental groups 1-7 is 15 g ai / mu each time, the amount of imidacloprid active ingredient sprayed by the imidacloprid group is 15 g ai / mu each time, the amount of fenpyrazone active ingredient sprayed by the fenpyrazone group is 8 g ai / mu each time, and the blank control group is sprayed with an equal amount of clean water. The spraying instrument adopts the 3WP-2000 walking spray tower produced by Nanjing Agricultural Mechanization Research Institute, with a fan-shaped nozzle flow rate of 590 mL / min, a walking speed of 642 mm / s, and a spray pressure of 0.3 MPa.

[0069] Investigation method: 21 days after application, weigh the fresh weight of the aboveground part of the weeds and calculate the fresh weight inhibition rate.

[0070] Fresh weight inhibition rate (%) = (blank control weed fresh weight - agent-treated weed fresh weight) ÷ blank control weed fresh weight × 100.

[0071] 3. Test results

[0072] The test results are shown in Table 1. Different types of betaine or its derivatives as adjuvants and imidacloprid are effective against weeds. Except for crabgrass and nightshade, the herbicidal compositions of Examples 1 to 7 are better than the control agent benzathine in removing weeds. On Leptochloa chinensis, Abutilon and Shepherd's purse, most different types of betaine or its derivatives as adjuvants have a significant synergistic effect on imidacloprid, that is, the herbicidal compositions of Examples 1 to 7 have strong weeding ability. Especially for shepherd's purse, the weeding ability of the herbicidal compositions of Examples 1 to 7 is higher than that of imidacloprid alone and the control agent benzathine.

[0073] Table 1 Fresh weight control effect of weeds 21 days later (%)

[0074]

[0075]

[0076] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A herbicidal composition, characterized in that: The herbicidal composition comprises imazethapyr and an adjuvant; The auxiliary agent is betaine and / or a betaine derivative; The mass ratio of the imidazolin to the auxiliary agent is 1:0.5-1.

5.

2. The herbicidal composition according to claim 1, characterized in that: The betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyl tetradecyldimethylammonium, 3-sulfopropyl hexadecyldimethylammonium, cocamidopropyl dimethylamine betaine and n-dodecyl-N,N-dimethylglycine.

3. The herbicidal composition according to claim 1, characterized in that: The betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyltetradecyldimethylammonium, 3-sulfopropylhexadecyldimethylammonium and n-dodecyl-N,N-dimethylglycine.

4. The herbicidal composition according to claim 1, characterized in that: The betaine derivative includes one of 3-decyldimethylaminopropane sulfonate, dimethylthioacetic acid, 3-sulfopropyltetradecyldimethylammonium and 3-sulfopropylhexadecyldimethylammonium.

5. The herbicidal composition according to claim 1, characterized in that: The betaine derivatives include 3-decyldimethylaminopropane sulfonate.

6. The herbicidal composition according to claim 1, characterized in that: The betaine derivatives include cocamidopropyl dimethylamino betaine.

7. Use of the herbicidal composition according to any one of claims 1 to 6 in weeding.

8. The use according to claim 7, characterized in that: The grasses include one or more of barnyard grass, lycopodii, crabgrass, ryegrass, nightshade, velvetleaf and shepherd's purse.

9. A method for weed control, characterized in that: The herbicidal composition according to any one of claims 1 to 6 is used for spraying weeds.

10. The method according to claim 9, characterized in that The spraying time is when the weeds have 2 to 3 leaves, the spraying frequency is 1 time, and the dosage of each spraying is 15 g ai / mu of the effective ingredient of imazethapyr.

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