A pharmaceutical agent for improving the defoliation and ripening effect and yield of chemical topping cotton

Abstract

The present application discloses a medicament for improving the defoliation and ripening effect and yield of chemically topping cotton. The active ingredients of the medicament are brassinolide, gibberellin and uniconazole; wherein the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (5000-9000): (200-400). The present application also provides a method for applying the medicament, which comprises mixing the medicament with water and diluting it, and then spraying it on the leaves. The medicament is used once 43-55 days after chemical topping of the cotton and 9-21 days before spraying the defoliant; the dosage of the medicament is 120-250 g of active ingredient per hectare. The medicament containing brassinolide, gibberellin and uniconazole of the present invention is sprayed in the middle growth period of the cotton plant, which can increase the boll weight and the number of bolls per plant while improving the sensitivity of the cotton to leafing and ripening, thereby promoting the increase in cotton yield and quality.

Description

Technical Field

[0001] The present invention relates to the field of crop planting and production, and relates to a pesticide preparation. Specifically, the present invention relates to a medicament for improving the defoliation and ripening effect and yield of chemical topping cotton and application thereof. Background Art

[0002] Xinjiang is my country's largest commercial cotton production base. With the continuous development of cotton cultivation in my country, the area of chemically topping cotton fields in Xinjiang is increasing, and over 90% of cotton fields are now mechanized for harvesting. Chemical defoliation involves using defoliants to accelerate the shedding of cotton leaves before harvest. This increased defoliation rate ensures efficient cotton harvesting, reduces dead leaves and hanging branches, and thus reduces the amount of impurities in the seed cotton. Defoliation also enhances field light and ventilation, promoting boll opening and boll shedding. Ripening technology promotes concentrated boll opening, reducing yield and quality losses caused by uneven growth and late maturation of cotton. Chemical defoliation and ripening are core supporting technologies for machine-picked cotton, crucial for improving clean cotton harvest rates, yield, and quality, and a prerequisite for successful machine-picking.

[0003] Currently, chemical topping is inefficient in cotton defoliation and boll opening due to temperature fluctuations, late boll ripening, and insufficient nutrients required for later development. This can lead to issues such as withered leaves that don't fall, unfilled cotton seeds, and defoliation rates below the required mechanically harvested cotton. Therefore, developing agents to increase yield and quality of mechanically harvested cotton, especially those harvested with chemical topping, and thus enhance the economic benefits for cotton farmers is crucial. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides an agent for improving the defoliation and ripening effect and yield of chemical topping cotton and its application.

[0005] In a first aspect, an embodiment of the present invention provides an agent for improving the defoliation and ripening effect and yield of chemical topping cotton, wherein the active ingredients of the agent are brassinolide, gibberellin and uniconazole; wherein the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (5000~9000): (200~400).

[0006] Preferably, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1:(5000-8000):(250-360).

[0007] More preferably, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (6000-7000): (280-320).

[0008] More preferably, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1:6750:302.

[0009] In some embodiments, the medicament further comprises excipients, and the excipients include one or more of an organic solvent, an emulsifier, a wetting agent, a dispersant, an antifreeze agent, a defoaming agent, a disintegrant, a pH regulator, and deionized water.

[0010] In some embodiments, in the agent, the sum of the mass of the brassinolide, the gibberellin and the uniconazole accounts for 4% to 20% of the mass of the entire agent, preferably 5% to 15%.

[0011] It is understood that the agent can be prepared into any agriculturally acceptable formulation, and its preparation method is well known to those skilled in the art, wherein it is preferably prepared into a soluble solution, emulsifiable concentrate, wettable powder, soluble powder or suspension.

[0012] In a second aspect, an embodiment of the present invention further provides the use of the above-mentioned agent in chemical topping of cotton, wherein the application includes:

[0013] Promote cotton defoliation;

[0014] and / or, promoting cotton boll opening;

[0015] and / or, promoting increased cotton production.

[0016] In some application embodiments, the promoting of cotton yield includes increasing the number of bolls per plant and / or increasing the weight of a single boll.

[0017] In a third aspect, an embodiment of the present invention also provides a method for improving the defoliation and ripening effect and yield of chemical topping cotton, comprising the following steps: mixing and diluting the above-mentioned agent with water, spraying it on the leaves, and using it once 43 to 55 days after chemical topping of the cotton and 9 to 21 days before spraying the defoliant.

[0018] In some embodiments, the dosage of the agent is 120 to 250 g of active ingredient per hectare, diluted 2000 to 2600 times.

[0019] Compared with related technologies, the technology of the present invention has the following advantages:

[0020] (1) The agent of the present invention, which contains brassinolide, gibberellin and uniconazole, is sprayed in the middle growth period of cotton plants, which can increase the sensitivity of cotton to defoliation and ripening while increasing the boll weight and the number of bolls per plant, thereby promoting the increase of cotton yield and quality.

[0021] (2) Compared with a single agent, the three components in the agent of the present invention have a good synergistic and synergistic effect. The effect of gibberellin in protecting flowers and fruits, the effect of brassinolide in increasing the number of bolls per plant, and the effect of uniconazole in promoting the conversion of photosynthetic products into bolls and promoting the development of cotton bolls are all stably enhanced.

[0022] (3) The agent of the present invention can largely avoid the problems of cotton boll deformity, easy rot and the like caused by the use of a single agent with a high concentration. DETAILED DESCRIPTION

[0023] With the continuous development of cotton cultivation in my country, chemical defoliation and ripening, as core supporting technologies for machine-picked cotton, are key to improving clean cotton picking rates, yield, and quality, and are prerequisites for the successful implementation of machine-picked cotton. Developing pesticides to increase yield and quality of machine-picked cotton, especially when chemically topping is used, is crucial for boosting farmers' economic benefits.

[0024] Brassinolide is a green and environmentally friendly plant growth regulator used in recent years. It can promote the growth of crops such as vegetables, fruits, etc. On cotton, it has the effects of promoting nutrient transport, increasing boll setting rate, and protecting flowers and fruits.

[0025] Gibberellic acid is a highly active plant growth regulator that can promote cell division and flower bud differentiation in cotton, stimulate cotton boll growth, and reduce boll shedding.

[0026] Uniconazole is a broad-spectrum, highly effective plant growth regulator that promotes lateral bud growth and flower bud formation, increases chlorophyll content, controls vigorous growth, and promotes reproductive growth of cotton plants. Its residual amount in the soil is extremely low, and it has little impact on subsequent crops.

[0027] Although the above-mentioned three agents, brassinolide, gibberellin and uniconazole, have a good promoting effect on crops, there has been no application of combining the three to increase the sensitivity of cotton plants to defoliation, which helps to defoliate, ripen and increase yield of chemical topping cotton in the later stage. Therefore, the research and development of the agent of the present invention has important practical significance for production.

[0028] It should be noted that the disclosure of the above information is only intended to increase understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art.

[0029] Unless defined otherwise herein, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0030] In this article, the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0031] As used herein, the term "plurality" refers to two or more (including two).

[0032] Where values are described herein as ranges, it should be understood that such disclosure includes disclosure of all possible sub-ranges within that range, as well as specific values falling within that range, regardless of whether a specific value or sub-range is explicitly stated.

[0033] As used herein, the terms "about" and "approximately" refer to + / - 10% of the recited value.

[0034] Unless otherwise stated, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0035] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0036] Based on relevant technologies, in order to improve the defoliation rate of chemical topping cotton, reduce the hanging branch rate and dead leaf rate, and avoid the loss of machine-picked cotton yield and quality decline due to the difficulty of ripening and defoliation, a cotton population that is both suitable for mechanized harvesting and conducive to increased production is constructed. In view of this:

[0037] In a first aspect, an embodiment of the present invention provides an agent for improving the defoliation and ripening effect and yield of chemical topping cotton, wherein the active ingredients of the agent are brassinolide, gibberellin and uniconazole; wherein the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (5000~9000): (200~400).

[0038] Non-limiting examples include: when the amount of brassinolide is 1 part by mass, the amount of gibberellin can be 5000 parts by mass, 5500 parts by mass, 6000 parts by mass, 6700 parts by mass, 6750 parts by mass, 7000 parts by mass, 7400 parts by mass, 8000 parts by mass, 8200 parts by mass, 8500 parts by mass, 9000 parts by mass, and the like; the amount of uniconazole can be 200 parts by mass, 250 parts by mass, 280 parts by mass, 300 parts by mass, 302 parts by mass, 320 parts by mass, 340 parts by mass, 350 parts by mass, 380 parts by mass, 400 parts by mass, and the like.

[0039] For example, in some embodiments, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1:6000:300, 1:5000:300, 1:7000:300, 1:6000:250, 1:6750:302, 1:7850:310, 1:8000:320, 1:9000:300, 1:5000:360, 1:9000:400 and the like.

[0040] Preferably, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1:(5000-8000):(250-360).

[0041] More preferably, the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (6000-7000): (280-320).

[0042] More preferably, the mass ratio of the brassinolide, the gibberellin, and the uniconazole is 1:6750:302. The inventors found during the experiment that, compared with the group without spraying, the cotton defoliation rate increased by 10.72%, the boll opening rate increased by 3.7%, and the seed cotton yield increased by 36.45%.

[0043] In some embodiments, the medicament further comprises excipients, and the excipients include one or more of an organic solvent, an emulsifier, a wetting agent, a dispersant, an antifreeze agent, a defoaming agent, a disintegrant, a pH regulator, and deionized water.

[0044] The organic solvent can be selected from one or more of benzene, toluene, xylene, acetone, dimethylformamide, chloroform, dichloromethane, cyclohexane and the like.

[0045] The emulsifier can be selected from: sodium lauryl sulfate, sodium dodecylbenzene sulfonate, nonylphenol polyoxyethylene ether phosphate amine salt, castor oil polyoxyethylene ether phosphate amine salt, polyoxyethylene fatty amide, diisopropylnaphthalene sulfonate, lignin sulfonate, nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene block polymer or more.

[0046] The wetting agent is a substance that reduces liquid-solid surface tension, increases the spreadability and penetration of liquids on solids, and thereby wets or accelerates wetting. It can improve the wetting and dispersion of the agent in water, improve the spreadability of the agent on the treated object, increase the permeability of the agent, and facilitate atomization. In some embodiments, the wetting agent is one or more of alkylnaphthalene sulfonates, Lakai powder BX (sodium butylnaphthalene sulfonate), dodecylbenzenesulfonic acid, fatty acid sulfates, and sodium lauryl ether sulfate.

[0047] The dispersant is a substance that prevents solid particles from agglomerating in a solid-liquid dispersion system, allowing the solid particles to remain uniformly dispersed in the liquid phase for a prolonged period of time. In some embodiments, the dispersant is one or more of alkylnaphthalenesulfonate formaldehyde condensates, alkylphenol polyoxyethylene ethers, polycarboxylic acid water reducers, and their derivatives.

[0048] The defoaming agent can be selected from one or more of butyl phosphate, isobutyl phosphate, n-octanol, silicone, and the like.

[0049] The antifreeze agent can be selected from one or more of ethylene glycol, propylene glycol, glycerol, etc.

[0050] The disintegrant can be selected from one or more of urea, sodium sulfate, and calcium sulfate.

[0051] The pH regulator can be selected from one or more of hydrochloric acid, citric acid, sodium bicarbonate, and sodium hydroxide.

[0052] In some embodiments, in the agent, the sum of the mass of the brassinolide, the gibberellin, and the uniconazole accounts for 4% to 20% of the mass of the entire agent, preferably 5% to 15%, and more preferably 10% to 15%. For non-limiting examples, the sum of the mass of the brassinolide, the gibberellin, and the uniconazole accounts for about 4%, about 5%, about 6%, about 7%, about 8%, about 9%, about 10%, about 11%, about 12%, about 13%, about 14%, about 16%, about 18%, about 20%, etc.

[0053] It is understood that the agent can be prepared into any agriculturally acceptable formulation, and its preparation method is well known to those skilled in the art, wherein it is preferably prepared into a soluble solution, emulsifiable concentrate, wettable powder, soluble powder or suspension.

[0054] As a specific example, an embodiment of the present invention provides an agent for improving the effectiveness and yield of chemically topping cotton defoliation and ripening. The agent comprises brassinolide, gibberellin, and uniconazole, along with excipients. The weight ratio of brassinolide, gibberellin, and uniconazole is 1:67:50:30:2, and the combined mass of brassinolide, gibberellin, and uniconazole accounts for approximately 13% of the total mass of the agent. The excipients include a dispersant, a wetting agent, citric acid, and deionized water. The dispersant is an alkylphenol polyoxyethylene ether, and the wetting agent is propylene glycol. The components are thoroughly mixed and prepared into a soluble solution using conventional production methods.

[0055] Secondly,

[0056] The embodiment of the present invention also provides the use of the above-mentioned agent in chemical topping of cotton, and the use includes:

[0057] Promote cotton defoliation;

[0058] and / or, promoting cotton boll opening;

[0059] and / or, promoting increased cotton production.

[0060] In some embodiments, the promoting cotton yield includes increasing the number of bolls per plant and / or increasing the weight of a single boll.

[0061] Thirdly,

[0062] An embodiment of the present invention also provides a method for improving the defoliation and ripening effect and yield of chemical topping cotton, comprising the following steps: mixing and diluting the above-mentioned agent with water, and spraying it on the leaves 43 to 55 days (for example, 43 days, 45 days, 46 days, 48 days, 50 days, 43 days, 43 days, 43 days, 55 days, etc.) after chemical topping of the cotton, and 9 to 21 days (for example, 9 days, 10 days, 12 days, 14 days, 15 days, 17 days, 18 days, 20 days, 21 days, etc.) before spraying the defoliant, preferably, once 15 to 21 days before spraying the defoliant.

[0063] It is understandable that the chemical topping agent used in the cotton chemical topping process is a chemical topping agent commonly used in the art, such as mepiquat.

[0064] It is understandable that the defoliant may be a defoliant commonly used in the art, such as a combination of thiadiazole and ethephon.

[0065] In an embodiment of the present invention, foliar spraying can be manual spraying or machine spraying (such as a drone).

[0066] As a specific example, the above-mentioned agent is mixed and diluted with water and then sprayed on the leaves once 45 days after chemical topping of cotton and 19 days before spraying of defoliant.

[0067] In some embodiments, the dosage of the agent is 120-250 g of active ingredient per hectare, diluted 2000-2600 times. For non-limiting examples, the dosage of the agent can be 120 g, 150 g, 160 g, 170 g, 190 g, 200 g, 250 g of active ingredient per hectare, etc., diluted 2000 times, 2100 times, 2200 times, 2300 times, 2400 times, 2500 times, 2600 times, etc.

[0068] The following are non-limiting examples of the present invention.

[0069] Example 1

[0070] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0071] Brassinolide 0.03g, gibberellin 202.5g, uniconazole 9.06g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 906.41g.

[0072] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0073] Example 2

[0074] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0075] Brassinolide 0.03g, gibberellin 210g, uniconazole 9g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 898.97g.

[0076] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0077] Example 3

[0078] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0079] Brassinolide 0.03g, gibberellin 180g, uniconazole 8.7g, alkylphenol polyoxyethylene ether 370g, propylene glycol 96g, citric acid 58g, deionized water 925.27g.

[0080] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0081] Example 4

[0082] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0083] Brassinolide 0.03g, gibberellin 225g, uniconazole 9g, alkylphenol polyoxyethylene ether 370g, propylene glycol 95g, citric acid 60g, deionized water 878.97g.

[0084] Usage: Add 500L / hm2 of water 2 The liquid medicine is evenly mixed and applied on the leaves 48 days after chemical topping of cotton (19 days before spraying the defoliant).

[0085] Example 5

[0086] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0087] Brassinolide 0.03g, gibberellin 202.5g, uniconazole 9.07g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 906.4g.

[0088] Usage: Add 460L / hm2 of water 2 The liquid medicine is evenly mixed and applied on the leaves 45 days after chemical topping of cotton (15 days before spraying the defoliant).

[0089] Example 6

[0090] This embodiment provides a soluble solution containing brassinolide, gibberellin and uniconazole. The formula is:

[0091] Brassinolide 0.03g, gibberellin 230g, uniconazole 10.5g, alkylphenol polyoxyethylene ether 400g, propylene glycol 100g, citric acid 60g, deionized water 837.47g.

[0092] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0093] Comparative Example 1

[0094] Comparative Example 1 provides a soluble preparation containing brassinolide. The formula is:

[0095] Brassinolide 0.03g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 1117.97g.

[0096] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0097] Comparative Example 2

[0098] Comparative Example 2 provides a soluble solution containing gibberellins. The formula is:

[0099] Gibberellic acid 202.5g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 915.5g.

[0100] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0101] Comparative Example 3

[0102] Comparative Example 3 provides a soluble solution containing uniconazole. The formula is:

[0103] Uniconazole 9.06g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 1108.94g.

[0104] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0105] Comparative Example 4

[0106] Comparative Example 4 provides a soluble solution containing brassinolide and gibberellin. The formula is:

[0107] Brassinolide 0.03g, gibberellin 202.5g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 915.47g.

[0108] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0109] Comparative Example 5

[0110] Comparative Example 5 provides a soluble solution containing brassinolide and uniconazole. The formula is:

[0111] Brassinolide 0.03g, uniconazole 9.06g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 1108.91g.

[0112] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0113] Comparative Example 6

[0114] Comparative Example 6 provides a soluble solution containing gibberellin and uniconazole. The formula is:

[0115] Gibberellic acid 202.5g, uniconazole 9.06g, alkylphenol polyoxyethylene ether 365g, propylene glycol 95g, citric acid 60g, deionized water 906.44g.

[0116] Usage: Add 450L / hm2 of water 2 The liquid medicine is evenly mixed and applied to the cotton leaves 45 days after chemical topping (19 days before defoliant spraying) by foliar spraying.

[0117] Experimental example

[0118] In Dafeng Town, Hutubi County, Xinjiang Uygur Autonomous Region (average altitude 460m, average frost-free period 180 days), the cotton variety planted was Xinlu Zao 82, and multiple groups of treatment spraying agents were set up, and the spraying time was 45 days after the cotton was chemically toppled.

[0119] T1 group: brassinolide 0.03g / hm 2 ; (Comparative Example 1)

[0120] T2 group: gibberellin 202.5g / hm 2 ; (Comparative Example 2)

[0121] T3 group: uniconazole 9.07g / hm 2 ; (Comparative Example 3)

[0122] T4 group: brassinolide 0.03g / hm 2 + Gibberellic acid 202.5g / hm 2 (Comparative Example 4)

[0123] T5 group: brassinolide 0.03g / hm 2 + uniconazole 9.07g / hm 2 (Comparative Example 5)

[0124] T6 group: gibberellin 202.5g / hm 2 + uniconazole 9.07g / hm 2 (Comparative Example 6)

[0125] The present invention's agent: brassinolide 0.03g / hm 2 + Gibberellic acid 202.5g / hm 2 + uniconazole 9.07g / hm 2 (Example 1)

[0126] CK: Clean water.

[0127] Wide film was used to cover 6 rows per film. The seeds were sown on April 12 and chemically topped on July 5 (the chemical topping agent was 98% mepiquat (225g / hm2). 2 )+ additives (150g / hm 2 ), on September 7, the first spraying of defoliant (thiadiazole and diuron 180g / hm2 2 , 40% ethephon 300g / hm 2 ), on September 19, the second spraying of defoliant (thiadiazole and diuron 195g / hm2 2 、40% ethephon 1050g / hm 2 ), the planting row spacing is (66±10) cm, and the planting density is 220,000 plants / hm 2 .

[0128] After the first spraying of defoliants, the number of fallen leaves and bolls was measured every 5 days, and the defoliation rate, defoliation rate, boll opening rate and boll opening rate were calculated. During the boll opening period, the number of bolls per plant, lint percentage, average boll weight and seed cotton yield were measured.

[0129] Table 1: Defoliation effect of cotton at different days after application of each group of pesticides

[0130]

[0131] It can be seen from Table 1 that after spraying the defoliant, the defoliation rate of cotton generally shows a trend of first increasing and then decreasing, that is, the shedding rate of cotton leaves increases rapidly from 5 to 15 days. The effect of clean water treatment on the defoliation effect of cotton is relatively small. The agent of the present invention has the most significant effect on the defoliation effect, which increases by 10.72% compared with clean water.

[0132] Table 2: Effect of cotton boll opening on different days after application of each agent

[0133]

[0134] Table 2 shows that the cotton boll opening rates for each treatment on the day of defoliant spraying ranged from 18.7% to 35.77%. After defoliant spraying, the cotton boll opening rate initially increased and then decreased, with the highest rate from 5 to 15 days, representing the critical period for cotton boll opening. The present invention achieved the best boll opening effect, with the final boll opening rate increasing by 3.7% compared to that of pure water.

[0135] Table 3: Economic traits of cotton after application of various pesticides

[0136] deal with Number of bells per plant Single bell weight (g) Clothing content (%) <![CDATA[Seed cotton yield (kg / hm 2 )]]> T1 6.26±0.09bc 5.92±0.02c 50.49±0.25a 7156.13±11.38c T2 6.11±0.04c 5.82±0.03d 50.21±0.4ab 6859.43±10.32cd T3 5.76±0.03d 6.23±0.07a 48.82±0.63d 6922.70±5.27c T4 7.07±0.13a 6.2±0.02a 50.50±0.23a 8289.37±25.16b T5 6.42±0.03b 6.13±0.02b 49.95±0.12abc 7147.47±8.86c T6 6.17±0.02c 6.27±0.1a 48.97±0.36cd 7288.87±11.66c Medicament of the present invention 6.54±0.18a 6.29±0.02a 49.23±0.08bcd 8795.5±18.53a CK 5.76±0.18d 5.96±0.02c 49.36±0.22bcd 6446.03±15.69d

[0137] As can be seen from Table 3, the agent of the present invention can effectively increase the number of bolls per plant and the weight of single boll, and its seed cotton yield reached 8795.5 kg / hm 2 , an increase of 36.45% compared with clear water.

[0138] As shown in Tables 1-3, the agent and application method provided herein for improving the defoliation and ripening efficacy and yield of chemically topping cotton, as well as the agent, can increase the defoliation rate, boll opening rate, and yield of cotton. Compared to treatments without the agent, the defoliation rate increased by 10.72%, the boll opening rate increased by 3.7%, and the seed cotton yield increased by 36.45%.

[0139] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0140] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A medicament for improving the defoliation and ripening effect and yield of chemical topping cotton, characterized in that: The active ingredients of the agent are brassinolide, gibberellin and uniconazole; wherein the mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (5000-8000): (250-360).

2. The agent for improving the defoliation and ripening effect and yield of chemical topping cotton according to claim 1, characterized in that: The mass ratio of the brassinolide, the gibberellin and the uniconazole is 1: (6000-7000): (280-320).

3. A medicament for improving the defoliation and ripening effect and yield of chemical topping cotton according to any one of claims 1 to 2, characterized in that: The medicament further includes excipients, which include one or more of an organic solvent, an emulsifier, a wetting agent, a dispersant, an antifreeze agent, a defoaming agent, a disintegrant, a pH regulator, and deionized water.

4. The agent for improving the defoliation and ripening effect and yield of chemical topping cotton according to claim 3, characterized in that: In the agent, the sum of the mass of the brassinolide, the gibberellin and the uniconazole accounts for 4% to 20% of the mass of the entire agent.

5. The agent for improving the defoliation and ripening effect and yield of chemical topping cotton according to claim 4, characterized in that: In the agent, the sum of the mass of the brassinolide, the gibberellin and the uniconazole accounts for 5% to 15% of the mass of the entire agent.

6. Use of the agent according to any one of claims 1 to 5 in chemical topping of cotton, characterized in that: The applications include: Promote cotton defoliation; and / or, promoting cotton boll opening; and / or, promoting increased cotton production.

7. Use of the agent according to claim 6 in chemical topping of cotton, characterized in that: The promoting of cotton yield increase includes increasing the number of bolls per plant and / or increasing the weight of a single boll.

8. A method for improving the defoliation and ripening effect and yield of chemical topping cotton, characterized in that: The method comprises the following steps: mixing and diluting the agent according to any one of claims 1 to 5 with water, spraying the mixture on the leaves, and using the mixture once 43 to 55 days after chemical topping of cotton and 9 to 21 days before spraying the defoliant.

9. The method for improving the defoliation and ripening effect and yield of chemical topping cotton according to claim 8, characterized in that: The dosage of the agent is 120-250 g of active ingredient per hectare, diluted 2000-2600 times.

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