CN111742930A

CN111742930A - Weeding composition containing potassium fulvate

Info

Publication number: CN111742930A
Application number: CN202010546044.XA
Authority: CN
Inventors: 郭晓刚; 汪顺生; 廖意凤
Original assignee: Anhui Xitian Biotechnology Co ltd
Current assignee: Anhui Xitian Biotechnology Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-10-09

Abstract

The invention provides a weeding composition containing potassium fulvate, wherein the ratio of glyphosate or salt thereof to potassium fulvate can be 30:1-6: 1; the potassium fulvate can be used for the weeding activity of glyphosate.

Description

Weeding composition containing potassium fulvate

Technical Field

The invention belongs to the field of pesticides, and particularly provides a weeding composition containing potassium fulvate.

Background

Glyphosate is a phosphorus-containing amino acid herbicide, and is 5-enolpyruvylshikimate-3-phosphate synthase (EPSP) inhibitor. The agent causes the death of weeds by inhibiting this enzyme, thereby destroying the synthesis of aromatic amino acids such as tryptophan, tyrosine, phenylalanine, which are essential for weeds. The glyphosate is mainly registered in apple gardens, citrus gardens, pear gardens, banana gardens, tea gardens, mulberry gardens, sugarcane fields, rubber gardens, sisal hemp gardens, forest trees, corn fields, cotton fields, no-tillage spring rape fields, no-tillage winter rape fields, no-tillage seedling throwing paddy fields, fireproof isolation belts and uncultivated areas, and has good control effect on annual weeds such as barnyard grass, green bristlegrass, alopecurus, digitaria sanguinea, xanthium sibiricum, goosegrass, cleavers and cleavers. The glyphosate belongs to a systemic conduction type chronic broad-spectrum biocidal herbicide, can play a role only by being systemically conducted into weed bodies, is slow in weeding speed, generally has obvious symptoms about 7 days, and is slow in action speed at low temperature.

The potassium fulvate has similar functions to chemically synthesized auxin, cell classifier, abscisic acid and other plant hormones in the agricultural use process, plays a comprehensive role in regulating the growth and development of plants, and belongs to a plant growth regulator. Research also shows that fulvic acid has a certain therapeutic effect on plant diseases: for example, CN108124905A discloses that fulvic acid aqueous solution can prevent gray mold. In addition, CN110432286A, CN110352984A and CN110352973A in the patent applications of agricultural biotechnology research institute in Hunan province disclose that fulvic acid and salts thereof can be used for preventing and controlling weeds in paddy fields and can improve the yield of rice; but the application mode is that the fertilizer is used together with organic fertilizer, and the prevention effect is poor when the fertilizer is applied under a lower dosage. The applicant found in earlier studies that potassium fulvate had substantially no control effect on weeds when used as a spray treatment of the foliage.

In addition, the patent application of Shenzhennuopuxin pesticide GmbH discloses that after the glyphosate and the sodium humate are used in combination, the weeding effect is quicker than that of a single glyphosate preparation by 48-72 hours, the application amount of a unit area can be reduced, and the growth of crops can be promoted. But its herbicidal effect is to be further enhanced.

In the case that the weeding speed of the glyphosate is low and the weeds are easy to generate serious drug resistance after long-term high-dose application, the applicant uses the glyphosate, potassium fulvate and 2, 4-dinitrophenol sodium in combination to obtain excellent technical effect.

Disclosure of Invention

The invention provides a weeding composition containing potassium fulvate, which can obviously improve the control effect of glyphosate on weeds, has an obvious enhancement effect on the weeding effect of the potassium fulvate on glyphosate, and effectively overcomes the defects in the prior art. The technical scheme provided by the invention is as follows:

a herbicidal composition comprising potassium fulvate comprising glyphosate or a salt thereof and potassium fulvate. The ratio of the glyphosate or the salt thereof to the potassium fulvate can be 30:1-6: 1. More preferably, the ratio of the glyphosate or salt thereof to the potassium fulvate can be 15: 1.

The dosage form of the weeding composition can be water agent, soluble powder and granules. The auxiliary materials can be wetting agents, dispersing agents, synergists, solvents, defoaming agent carriers, defoaming agents and the like. The concrete options are: organosilicon, Silwet618, glycerol, water, 2, 4-dinitrophenol sodium, tallow amine polyoxyethylene ether, calcium lignosulphonate, sodium dodecyl benzene sulfonate, ammonium sulfate, urea and soluble starch.

The dosage form of the herbicidal composition of the present invention preferably comprises the synergist sodium 2, 4-dinitrophenol.

The weight percentage content of the glyphosate and the fulvic acid potassium in the weeding composition accounts for 1-80% of the total amount of the preparation. Preferably 10-60%. More preferably 10-50%.

The potassium fulvate is used for improving the weeding activity of glyphosate.

Compared with the prior art, the invention has the following beneficial effects:

the weeding composition provided by the invention has an excellent weeding effect, and the potassium fulvate can be used for improving the weeding activity of glyphosate. Compared with a 30% glyphosate isopropylammonium aqua, the formulation of the preparation 1-4 can improve the weed control by more than 10%. In addition, the 2, 4-dinitrophenol sodium also has a certain promotion effect on the improvement of the control effect of the glyphosate or the salt thereof.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in conjunction with examples, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Example 1: bioassay test

Test agents: 30% glyphosate isopropylammonium salt aqua and potassium fulvate; commercially available

The test method comprises the following steps: the test was carried out in a greenhouse. After the soil is sieved, 200g of soil is filled in each pot. Moistening and soaking soil, covering each pot with 15 grains of Amaranthus retroflexus, covering with 1cm of dry soil, sowing, and culturing in greenhouse. And (3) seedling 2 pieces of Amaranthus retroflexus in the true leaf stage, reserving 8 plants in each pot, and spraying the pesticide in the 4-leaf stage. A quantitative spray tower is adopted, the liquid spray amount is 500L/ha, and the spray pressure is 0.5 KPa. Three replicates were performed, with clear water as control. Wherein, the addition amount of the fulvic acid potassium in the 10 percent glyphosate water agent is 0.1 percent, 0.5 percent, 1 percent, 1.5 percent and 3 percent.

The survey statistical method comprises the following steps: after 14 days of application, the fresh weight of the aerial parts was investigated and the growth inhibition rate was calculated. The growth inhibition rate is converted into a probability value, and the dosage is converted into a logarithm, and then virulence regression formulas of different treatments are worked out. The ED50 values were calculated from the results 14 days after treatment. Comparison of the magnitude of the effect of each treatment on glyphosate activity is expressed in relative virulence index. When the relative toxicity index is larger than 1, the synergistic effect is shown, and when the relative toxicity index is l, the additive effect is shown; antagonism is indicated when the relative virulence index is < l.

Results and analysis

The activity of the glyphosate Amaranthus retroflexus can be obviously improved by adding 1-5% of potassium fulvate. After 14 days of medicine application, the ED50 value of the glyphosate for the amaranthus retroflexus is 559.47g a.i./ha, and the ED50 value of the amaranthus retroflexus is reduced to 97.73-385.38g a.i./ha after 1-5% of potassium fulvate is added. In 4 addition amounts, the best inhibition effect is achieved by adding 2% of potassium fulvate. In the process of increasing the adding amount from 1-10%, the activity of the composition is increased and then reduced along with the increase of the adding amount. Because the glyphosate is not a contact herbicide and can only act after being absorbed and conducted in the bodies of weeds, the potassium fulvate can improve the conduction efficiency of the glyphosate, but the larger the addition amount of the potassium fulvate is, the better the conduction efficiency is; when the addition amount is 10%, a remarkable antagonistic effect appears.

TABLE 1 Effect of Potassium Fulvate on Glyphosate inhibition of Amaranthus retroflexus Activity

Remarking: when the potassium fulvate is tested separately at 500ppm, the stem and leaf spray has no activity on the Amaranthus retroflexus.

Example 2: pesticide formulation

Preparation 1: 30% glyphosate isopropylammonium salt aqua

30% of glyphosate isopropyl ammonium, 2% of potassium fulvate, 1.0% of organic silicon, 1.5% of Silwett 6183.5%, 5% of sodium dodecyl benzene sulfonate, 2% of ethylene glycol and the balance of water to 100%.

Preparation 2: 10% glyphosate ammonium salt water agent

10% of glyphosate ammonium salt, 1% of potassium fulvate, 1% of 2, 4-dinitrophenol sodium, 0.5% of organic silicon, 600# 2% of agricultural milk, 7% of sodium lignosulfonate, 2% of glycerol and the balance of water to 100%.

Preparation 3: 50% glyphosate isopropylammonium soluble powder

50% of glyphosate, 7% of potassium fulvate, 4% of tallow amine polyoxyethylene ether, 6% of calcium dodecyl benzene sulfonate, 4% of ammonium sulfate, 1% of urea and the balance of soluble starch to 100%.

Preparation 4: 50% glyphosate isopropylammonium soluble powder

50% of glyphosate, 7% of potassium fulvate, 4% of tallow amine polyoxyethylene ether, 6% of calcium dodecylbenzene sulfonate, 1% of 2, 4-dinitrophenol sodium, 4% of ammonium sulfate, 1% of urea and the balance of soluble starch to 100%.

Preparation 5: 30% glyphosate isopropylammonium salt aqua

30% of glyphosate isopropylammonium, 2% of potassium fulvate, 0.5% of 2, 4-dinitrophenol sodium, 1.0% of organic silicon, Silwet 6184%, 4% of sodium dodecyl benzene sulfonate, 2% of ethylene glycol and the balance of water to 100%.

Example 3 field control efficacy test

Test agents: a 30% glyphosate isopropylammonium salt aqua is commercially available; 60% Glyphosate-sodium humate water dispersible granule (prepared according to CN101779676A example 1)

And the agent of the invention in example 2.

Weed species: barnyard grass, crab grass and redroot amaranth.

The test method comprises the following steps: the test is designed by adopting a random block test method, the area of a test cell is 20m2(5m x 4m), and the spraying treatment is carried out when the weeds grow more than 4 leaves. Spraying the pesticide at night in a divided mode, wherein the spraying weather is clear, a back type sprayer and four groups of fan-shaped spray heads are adopted, and the spraying liquid amount is 450L/ha.

The survey statistical method comprises the following steps: and investigating the fresh weight of the overground part of the weeds 21 days after the application of the herbicide, and calculating the total control effect of the weeds.

Results and analysis

The potassium fulvate is added into the formulation, so that the field control effect of the glyphosate on weeds can be obviously improved. Compared with a commercially available 30% glyphosate isopropylammonium salt aqueous solution and 60% glyphosate-sodium humate water dispersible granules, the formulation of the preparation 1-5 can improve the weed control by more than 10%. In addition, the 2, 4-dinitrophenol sodium also has a certain promotion effect on the improvement of the glyphosate control effect. The mechanism of action remains to be studied further.

TABLE 2 determination of field control efficacy

The above description is only a preferred embodiment of the present invention, and it is obvious to those skilled in the art that modifications may be made without departing from the scope of the present invention, and such modifications are also within the scope of the present invention.

Claims

1. A weeding composition containing potassium fulvate comprises glyphosate or a salt thereof and potassium fulvate, wherein the glyphosate salt can be ammonium salt, isopropylammonium salt or dimethylammonium salt.

2. A herbicidal composition according to claim 1, wherein the ratio of glyphosate or a salt thereof to potassium fulvate is from 30:1 to 6: 1.

3. A herbicidal composition according to claim 2, wherein the ratio of glyphosate or a salt thereof to potassium fulvate is 15: 1.

4. The herbicidal composition as claimed in any one of claims 1 to 3, wherein the formulation of the herbicidal composition is selected from aqueous solution, soluble powder and granule.

5. A herbicidal composition according to any one of claims 4, wherein glyphosate or a salt thereof and potassium fulvate are present in an amount of 1 to 80% by weight of the total formulation.

6. Use of potassium fulvate to increase the herbicidal activity of glyphosate or a salt thereof.