Suspending agent containing prohexadione calcium and mepiquat chloride and application thereof

Abstract

The invention belongs to the field of plant growth regulators, and relates to a suspending agent containing prohexadione calcium and mepiquat chloride and application thereof. The suspending agent comprises the following components in percentage by weight: 3-5% of prohexadione calcium, 25-27% of mepiquat chloride, 5-12% of a wetting dispersant, 0.1-2% of a thickening agent, 0.1-1.5% of a defoaming agent, 3-8% of an anti-freezing agent, 0.1-1% of a preservative and the balance of deionized water. The wetting dispersant is one or two selected from the group consisting of Tersperse2020 and Terwet 1004 which are matched with Morwet D-390 and Atplus1209, and the wetting dispersant is one or two selected from the group consisting of Tersperse2020 and Terwet 1004 which are matched with Morwet D-390 and Atplus1209. The suspending agent prepared by the invention has excellent preparation performance and high suspension rate, is used for crop growth regulation, and has excellent plant growth regulation performance.

Description

Technical Field

[0001] The invention belongs to the field of plant growth regulators, and specifically relates to a suspension containing prohexadione calcium and mepiquat and an application thereof. Background Art

[0002] Calcium cyclohexanecarboxylate belongs to the cyclohexanecarboxylic acid plant growth regulator. It can be absorbed through plant seeds, roots and leaves, inhibit the synthesis of gibberellic acid, dwarf the plants, promote tillering, control excessive growth, prevent lodging, and improve the crop's resistance to stress.

[0003] Mepiquat can inhibit the biosynthesis of gibberellic acid, control excessive growth, dwarf plants, promote the development of root system, shorten internode length, increase chlorophyll content, make plants compact, promote fruit setting and early maturity, and increase yield.

[0004] The pesticide registration PD20242619 of Shaanxi Yitianfeng Crop Science and Technology Co., Ltd. discloses a 300 g / L mepiquat-calcium procyclate suspension. It is applied once in the early stage of wheat jointing. The recommended water addition amount is 30-40 kg / mu. The mixture can effectively shorten the internodes at the base of wheat, enhance the ability to resist lodging, promote the differentiation and firming of wheat, and increase yield.

[0005] CN202310200121.X discloses a growth regulating composition containing prohexadione calcium and mepiquat, wherein the active ingredients include prohexadione calcium and mepiquat, and the mass ratio of prohexadione calcium to mepiquat is 20-50:1-20. The dosage form of the growth regulating composition is an aqueous solution, a suspension, a wettable powder, a water-dispersible granule, and a dispersible oil suspension; after growth regulation of cotton, it can be found that the growth regulating composition can promote early boll formation, more boll formation, and reduce shedding of cotton plants, and has a more obvious effect of increasing yield and improving quality. After the two are compounded, the amount of prohexadione calcium and mepiquat can be reduced and the same excellent effect can be achieved, and the regulation range can be expanded, the efficacy and selectivity can be improved, and the cost of medication can be relatively reduced, and the residual effect period of the agent can be shortened, and drug damage can be avoided to make the crop safe.

[0006] CN202311771231.8 discloses a suspension containing calcium prohexadione and mepiquat, which contains the following ingredients in percentage by weight: 5% calcium prohexadione, 30% mepiquat, 3-6% accelerator, 1-15% wetting and dispersing agent, 1-5% thickener, 1-5% antifreeze agent, 0.05-0.5% preservative, 0.1-1.5% defoaming agent, and 100% deionized water; it can effectively regulate the growth of wheat, has a high yield increase rate, is safe for wheat within the recommended dosage range, and is suitable for promotion and application in wheat fields.

[0007] Although the prior art discloses the registration of suspension pesticides of prohexadione-calcium and mepiquat-chloride, as well as patent documents, it is found in actual application that the plant growth regulating performance needs to be further improved and the formulation performance of the suspension needs to be further optimized. Summary of the invention

[0008] The present invention provides a suspension containing prohexadione calcium and mepiquat and application thereof. The technical scheme of the present invention is:

[0009] A suspension containing prohexadione calcium and mepiquat, comprising the following components in percentage by weight: 3-5% of prohexadione calcium, 25-27% of mepiquat, 5-12% of wetting and dispersing agent, 0.1-2% of thickener, 0.1-1.5% of defoamer, 3-8% of antifreeze agent, 0.1-1% of preservative, and deionized water to make up 100%;

[0010] The wetting and dispersing agent is one or two of Tersperse 2020 and Terwet 1004 in combination with Morwet D-390 or Atp lus 1209. Preferably, the wetting and dispersing agent consists of Tersperse 2020, Terwet 1004, Morwet D-390 and Atp lus 1209.

[0011] The thickener is one or both of magnesium aluminum silicate and xanthan gum; the antifreeze agent is ethylene glycol; the preservative is sodium benzoate; and the defoaming agent is SAG1572.

[0012] The suspension concentrate of the present invention comprises the following ingredients in percentage by weight: 3-5% of calcium prohexadione, 25-27% of mepiquat, 1-3% of Tersperse 2020, 1-3% of Terwet 1004, 1-3% of Morwet D-390, 1-3% of Atp l us 1209, 0.4-0.6% of xanthan gum, 0.1-0.5% of magnesium aluminum silicate, 0.1-1.5% of SAG 1572, 3-8% of ethylene glycol, 0.1-1% of sodium benzoate, and deionized water to make up to 100%;

[0013] The suspension concentrate of the present invention comprises the following components in percentage by weight: 4% of prohexadione calcium, 26% of mepiquat, 20202% of Tersperse, 42% of Terwet 100, 2% of Morwet D-390, 2% of Atplus1209, 0.5% of xanthan gum, 0.2% of magnesium aluminum silicate, 5% of ethylene glycol, 0.25% of sodium benzoate, 0.5% of SAG1572, and deionized water to make up to 100%.

[0014] The suspension concentrate of the present invention is used for regulating crop growth. The crops include rice, cotton, potato, grape, wheat, peanut, corn, vegetables, flowers or beans. Preferably, the crop is rice.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] The wetting and dispersing agent combination of Tersperse 2020 and Terwet 1004 with one or both of Morwet D-390 or Atplus 1209 can better control the particle size growth performance and avoid Ostwald ripening phenomenon;

[0017] The 30% prohexadione-calcium and mepiquat suspension prepared by the invention can significantly inhibit the plant height of rice and improve the lodging resistance of rice; in particular, the lodging resistance of suspension formulation 1 is significantly improved. DETAILED DESCRIPTION

[0018] The specific implementation manner of the present invention is further explained below in conjunction with specific embodiments.

[0019] Example 1 Preparation of 30% Prohexadione Calcium and Mepiquat Suspension Concentrate

[0020] Test Materials:

[0021] Technical materials: calcium prohexadione, mepiquat; wetting and dispersing agents: Tersperse2020, Terwet1004, Morwet D-390, Morwet IP, Atp l us1209, Soprophor FD; thickeners: magnesium aluminum silicate, xanthan gum; antifreeze: ethylene glycol; preservative: sodium benzoate; defoamer: SAG1572; solvent: deionized water;

[0022] Instruments: electronic balance, dispersed sand mill, pH meter, high performance liquid chromatograph, laser particle size distribution analyzer, water bath, etc.

[0023] Preparation method: according to the formula composition, first add part of water, antifreeze agent, preservative, wetting dispersant and part of defoamer, use laboratory dispersion sand mill to shear for 5-10 minutes, then add thickener, prohexadione calcium, mepiquat, continue shearing for 10-15 minutes, transfer to dispersion sand mill for sand milling, sand milling time is 1.0-1.5h, particle size is controlled to be D90≤5μm, zirconium beads are filtered after sand milling, then add the remaining defoamer and the remaining water, shear and mix evenly, and carry out detection and analysis of various technical indicators;

[0024] Detection method: The mass fraction of active ingredients was determined by HPLC; pH value, suspension rate, pourability, persistent foaming, wet sieving test, low temperature stability and heat storage stability test were all determined according to national standards.

[0025] Suspension formulation screening:

[0026] Table 1: Suspension Concentrate Formulation

[0027]

[0028]

[0029] Results and analysis:

[0030] In the preparation of suspension SC, Ostwald ripening is prone to occur, leading to water precipitation, hot storage paste, bottoming or crystallization, etc. Therefore, the wetting and dispersing agent in this system is required to have good performance in controlling particle size growth. As shown in Table 2, different wetting and dispersing agent combinations have a significant effect on the appearance and water precipitation rate of the preparation after hot storage. After hot storage, the suspension formulations 1, 4, and 5 are not creamed and bottomed at room temperature, have good fluidity, and have a low water precipitation rate, especially the water precipitation rate of formulation 1 is only 0.2%; after hot storage, the suspension formulations 3, 6, 7, and 8 will have a small amount of bottoming phenomenon and a high water precipitation rate; it can be seen that the wetting and dispersing agent combination Tersperse2020 and Terwet 1004, combined with one or two of Morwet D-390 or Atplus1209, can better control the particle size growth performance and avoid Ostwald ripening.

[0031] Table 2: Effect of wetting and dispersing agents on the performance of suspension preparations

[0032]

[0033]

[0034] As shown in Table 3, the SC prepared by suspension formulations 1, 3, and 5 have excellent formulation properties, especially formulation 1 can significantly improve the suspension properties of the formulation.

[0035] Table 3: 30% prohexadione calcium and mepiquat suspension

[0036]

[0037] Example 2: Effects of different suspension concentrate formulations on rice lodging resistance

[0038] Experimental site: Rice is planted all year round in the experimental site, with convenient irrigation and drainage, good water retention, a soil pH of 6.1, and relatively uniform fertility.

[0039] Test agent: Treatments 1-3 are suspension formulations 1, 4, and 5 of the examples; treatment 4 is the SC-4 formulation in CN202311771231.8

[0040] Test method: refer to "Guidelines for Field Efficacy Tests of Pesticides (II) Part 140: Test of Rice Growth Regulators" (GB / T17980.140-2004). The test set up a treatment group and a control group, with 4 replicates for each treatment, a plot area of ​​20m2, and a random block arrangement. A protective row was left between each plot to ensure that the treatments did not interfere with each other. The dosage of the test agent is shown in the table below. Rice was transplanted manually, and conventional field management such as water and fertilizer was adopted. At the end of rice tillering, a backpack hand-cranked sprayer was used to evenly spray the rice in each test plot, with a water consumption of 600L / hm2.

[0041] Methodology:

[0042] Lodging investigation: When the rice plants in the blank control area lodged, investigate the rice lodging index. Take samples at 5 points in each plot, with 50 ears at each point. Investigate the lodging situation of each treatment in a graded manner, and calculate the lodging index and anti-lodging effect of each treatment.

[0043] Grading Standard:

[0044] Level 0, no lodging;

[0045] Level 1, lodging inclination <15°

[0046] Level 3, lodging inclination 15°-45°

[0047] Level 5, lodging inclination> 45°;

[0048] Lodging index (%) = ∑ (number of lodging ears at each level × relative level value) / total number of surveyed ears × 5) × 100;

[0049] Anti-lodging effect (%) = (control lodging index - treatment lodging index) / control lodging index × 100;

[0050] Survey on plant height and effective ear number:

[0051] At rice harvest, plant height and effective panicle number per unit area were investigated. Ten representative rice plants were randomly surveyed in each plot, and the plant height growth inhibition rate was calculated. Five diagonal points were sampled in each plot, and 0.25 m 2 The number of effective ears.

[0052] Results and analysis:

[0053] As shown in Table 4, the 30% prohexadione-calcium and mepiquat suspension prepared by the present invention can significantly inhibit the plant height of rice and improve the lodging resistance of rice; in particular, the lodging resistance of suspension formulation 1 is significantly improved.

[0054] Table 4: Effects of different suspension concentrate formulations on rice lodging resistance

[0055]

[0056] Finally, it should be noted that the above examples are only some specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art are considered to be within the scope of protection of the present invention.

Claims

1. A suspension concentrate comprising prohexadione-calcium and mepiquat, characterized in that: The composition comprises the following ingredients in percentage by weight: 3-5% calcium prohexadione, 25-27% mepiquat, 5-12% wetting and dispersing agent, 0.1-2% thickener, 0.1-1.5% defoamer, 3-8% antifreeze agent, 0.1-1% preservative, and 100% deionized water; The wetting and dispersing agent is one or two of Tersperse 2020 and Terwet 1004 combined with Morwet D-390 or Atplus 1209.

2. The suspending agent according to claim 1, characterized in that The thickener is one or both of magnesium aluminum silicate or xanthan gum; the antifreeze agent is ethylene glycol; the preservative is sodium benzoate; and the defoaming agent is SAG1572.

3. The suspending agent according to claim 1 or 2, characterized in that The wetting and dispersing agent consists of Tersperse 2020, Terwet 1004, Morwet D-390 and Atplus 1209.

4. The suspending agent according to claim 3, characterized in that The invention comprises the following ingredients in percentage by weight: 3-5% of calcium prohexadione, 25-27% of mepiquat, 1-3% of Tersperse 2020, 1-3% of Terwet 1004, 1-3% of Morwet D-390, 1-3% of Atplus 1209, 0.4-0.6% of xanthan gum, 0.1-0.5% of magnesium aluminum silicate, 0.1-1.5% of SAG 1572, 3-8% of ethylene glycol, 0.1-1% of sodium benzoate, and deionized water to make up to 100%.

5. The suspending agent according to claim 4, characterized in that The invention comprises the following ingredients in percentage by weight: 4% calcium prohexadione, 26% mepiquat, 2% Tersperse 2020, 2% Terwet 1004, 2% Morwet D-390, 2% Atplus 1209, 0.5% xanthan gum, 0.2% magnesium aluminum silicate, 5% ethylene glycol, 0.25% sodium benzoate, 0.5% SAG 1572, and deionized water (100%).

6. Use of the suspension concentrate according to any one of claims 1 to 5 for crop growth regulation.

7. The use according to claim 6, characterized in that The crops include rice, cotton, potato, grape, wheat, peanut, corn, vegetables, flowers or beans.

8. The use according to claim 7, characterized in that The crop is rice.

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