阅读说明：本技术 一种提高棉花产量和/或改善纤维品质的方法 (Method for increasing cotton yield and/or improving fiber quality ) 是由 罗昌炎 詹姆斯.T.布里斯托 于 2018-07-11 设计创作，主要内容包括：本发明提供了一种含有氟节胺和调环酸钙的植物生长调节剂组合物在棉花打顶上的应用,所述植物生长调节剂组合物施用至棉花植物的叶部和顶部,所述氟节胺和调环酸钙的重量配比为50:1-1:1。本发明还提供了一种改善棉花植物作物的产量和/或棉花纤维品质的方法。(The invention provides application of a plant growth regulator composition containing flumetralin and prohexadione calcium to cotton topping, wherein the plant growth regulator composition is applied to the leaves and tops of cotton plants, and the weight ratio of the flumetralin to the prohexadione calcium is 50:1-1: 1. The invention also provides a method of improving the yield of a cotton plant crop and/or the quality of cotton fiber.)

1. Use of a plant growth regulator composition comprising flumetralin and prohexadione-calcium for cotton topping, wherein the plant growth regulator composition is applied to the foliage and tops of cotton plants.

2. Use according to claim 1, wherein the weight ratio of flumetralin to prohexadione-calcium is 50:1 to 1:1, preferably 50:1 to 5:1, more preferably 50:1 to 8:1, more preferably 45:1 to 8:1, more preferably 40:1 to 8:1, more preferably 35:1 to 8:1, more preferably 30:1 to 8:1, more preferably 28:1 to 8:1, more preferably 25:1 to 8:1, more preferably 20:1 to 8:1, more preferably 18:1 to 8:1, more preferably 15:1 to 8:1, more preferably 12:1 to 8: 1.

3. Use according to claim 2, wherein the plant growth regulator composition comprises flumetralin and prohexadione-calcium, together with agriculturally acceptable adjuvants and/or carriers.

4. The use according to claim 3, wherein the plant growth regulator composition comprises 5% to 50%, preferably 8% to 45%, more preferably 10% to 40%, and still more preferably 15% to 40% by weight of the plant growth regulator composition, of the sum of the amounts by weight of flumetralin and prohexadione calcium.

5. The use of claim 3, wherein the plant growth regulator composition is in the form of effervescent tablets, water dispersible granules, suspending agents, suspoemulsions, aqueous emulsions, emulsifiable concentrates, ultra-low volume liquids, electrostatic oil solutions, dispersible oil suspensions, granules or dry suspensions.

6. A method of treating cotton plants comprising applying a plant growth regulator composition comprising flumetralin and prohexadione-calcium to the foliage and tops of said cotton plants.

7. The method according to claim 6, wherein the weight ratio of flumetralin to prohexadione-calcium in the plant growth regulator composition is 50:1 to 1:1, preferably 50:1 to 5:1, more preferably 50:1 to 8:1, more preferably 45:1 to 8:1, more preferably 40:1 to 8:1, more preferably 35:1 to 8:1, more preferably 30:1 to 8:1, more preferably 28:1 to 8:1, more preferably 25:1 to 8:1, more preferably 20:1 to 8:1, more preferably 18:1 to 8:1, more preferably 15:1 to 8:1, more preferably 12:1 to 8: 1.

8. The method according to claim 6, wherein the plant growth regulator composition comprising flumetralin and prohexadione-calcium is applied to the foliage and tops of cotton plants from the first occurrence of fine flower buds to the full bloom stage.

9. A method of improving the yield of a cotton plant crop and/or the quality of cotton fiber comprising applying to cotton a plant growth regulator composition comprising flumetralin and prohexadione-calcium.

10. The method according to claim 9, wherein the weight ratio of flumetralin to prohexadione-calcium in the plant growth regulator composition is 50:1 to 1:1, preferably 50:1 to 5:1, more preferably 50:1 to 8:1, more preferably 45:1 to 8:1, more preferably 40:1 to 8:1, more preferably 35:1 to 8:1, more preferably 30:1 to 8:1, more preferably 28:1 to 8:1, more preferably 25:1 to 8:1, more preferably 20:1 to 8:1, more preferably 18:1 to 8:1, more preferably 15:1 to 8:1, more preferably 12:1 to 8: 1.

11. The method of claim 9, comprising applying the plant growth regulator composition comprising flumetralin and prohexadione-calcium to the foliage and tops of cotton plants.

12. The method of claim 9, comprising the steps of:

(i) diluting a concentrate of a plant growth regulator composition comprising flumetralin and prohexadione-calcium in water;

(ii) the diluted composition was applied to the top and foliage of cotton plants.

13. A plant growth regulator composition is characterized by comprising 5-50% of flumetralin and prohexadione calcium and 5-50% of aliphatic alcohol with 8-10 carbon atoms; the ratio of the flumetralin to the prohexadione calcium is 50:1-1: 1.

14. The composition according to claim 13, wherein the aliphatic alcohol having 8 to 10 carbon atoms is selected from the group consisting of decanol and 2-ethylhexanol.

15. Use of the plant growth regulator composition of claim 13 for cotton topping.

16. A plant growth regulator composition is characterized by comprising 5-50% of flumetralin and prohexadione calcium and 5-25% of sodium hydroxide aqueous solution with the concentration of 2-5%; the ratio of the flumetralin to the prohexadione calcium is 50:1-1: 1.

17. Use of the plant growth regulator composition of claim 16 for cotton topping.

Technical Field

The invention relates to the field of agriculture, in particular to a method for improving cotton yield and/or improving fiber quality.

Background

The cotton has unlimited growth habit, and under a certain temperature condition, the tip continuously extends and continuously differentiates new stems, leaves and fruit branches. If allowed to grow, the cotton plant has apical dominance and water and nutrients are preferentially supplied to the apical buds, thereby affecting the growth of lateral buds.

Cotton topping is a pruning technique commonly adopted in cotton areas in China. The cotton topping can break the growth advantage of the top of the main stem, so that nutrients are supplied to the buds and the bolls for growth in a centralized manner; but also can control the height of the main stem and reduce ineffective fruit branches, so that the bud bells on the fruit branches at the middle and lower parts are more full. Meanwhile, the ventilation and light transmission conditions of the cotton field are improved, the precocity is promoted, and rotten bolls are reduced.

The traditional topping is to manually remove the growing points of the main stems of the cotton, which is labor-consuming and time-consuming. In order to replace manual cotton topping, various topping machines are used for cotton topping. For example, CN108076886A, CN103493692A and CN104604558B disclose a cotton topping device which effectively eliminates the top advantages of cotton plants to achieve accurate topping. However, mechanical topping often causes excessive loss to cotton plants and bolls, and the operation efficiency is not high. Manual topping and mechanical topping are collectively referred to as physical topping.

The appearance of the chemical topping agent reduces the labor intensity of workers and improves the working efficiency. The chemical topping is to utilize plant growth regulator to delay or inhibit the growth of cotton tip and control its unlimited growth habit, so as to achieve the goal of regulating vegetative growth and reproductive growth by artificial topping.

CN106818855A discloses a chemical topping agent for cotton, which takes mepiquat chloride and ethephon as main active ingredients, is compounded with naphthenate and sodium salicylate by an emulsifying means to achieve the effects of synergy, slow release and synergy, can induce the self-capping of cotton by spraying on leaf surfaces of cotton from the initial blossom to the full-bloom stage once, and solves the defect that the traditional chemical topping technology only focuses on controlling the plant growth and does not focus on promoting the cotton boll development.

CN102823411B discloses a cotton chemical topping method, which comprises the following specific operations: a. spraying mepiquat chloride 3-5 days before and after the initial flowering period of cotton to perform basic chemical control; b. spraying a chemical topping agent on leaf surfaces of cotton before and after the full-bloom period; c. spraying mepiquat chloride within 3-15 days after the chemical topping agent is sprayed for plant shape stabilizing chemical control; the topping agent is as follows: 20-30% of mepiquat chloride water emulsion and 40-60% of water in percentage by weight; 15% -25% of flumetralin emulsion. The cotton topping machine can realize self-topping of cotton, guarantee topping quality, improve topping uniformity of cotton fields, improve labor efficiency and reduce labor intensity of workers.

However, after chemical topping of cotton, because the top advantages of plants are removed by topping, the growth center of cotton plants is changed, the original library source relationship of the cotton plants is greatly changed, distribution of assimilation substances and mineral elements in vivo is influenced, a large amount of bud bolls fall off, boll weight is reduced, and a serious person falls off a large amount of leaves before boll opening to generate a premature senility phenomenon, so that the yield and quality of cotton are influenced.

At present, flumetralin and mepiquat chloride are often used as main components of cotton chemical topping agents, wherein the flumetralin is a synthetic plant growth regulator containing fluorine nitrobenzene or quaternary ammonium salt, is a typical plant growth inhibitor, can inhibit division and growth of generative cells in axillary buds after entering a plant body, thereby inhibiting germination of the axillary buds, dwarfing the plant, thickening the stem, thickening the petiole, increasing chlorophyll and enhancing photosynthesis, and is generally used as a tobacco sprout inhibitor. Mepiquat chloride has a function of delaying the vegetative growth of plants; the mepiquat chloride can be absorbed by the leaves and roots of plants and is conducted to the whole plants, so that the activity of gibberellin in the plants can be reduced, the cell elongation is inhibited, the growth vigor of terminal buds is weakened, the longitudinal and transverse growth of the plants is controlled, the internodes of the plants are shortened, the plant types are compact, the leaf colors are dark, the leaf areas are reduced, the synthesis of chlorophyll is enhanced, the vigorous growth of the plants can be prevented, the block is delayed, and the like.

However, the application of flumetralin alone or in combination with mepiquat chloride as a cotton topping agent has unstable application effect, and has significant inhibition effect on top bolls and leaves of cotton plants, so that the development of the top bolls is hindered, and the delayed boll opening and even the greedy late maturing of cotton are often caused.

Therefore, it is desired to obtain a cotton topping agent which has a low dose and an excellent persistence of the chemical effect, does not induce phytotoxicity, can realize labor productivity, and ensures effective topping while not affecting the yield and quality of cotton.

Disclosure of Invention

The invention provides application of a plant growth regulator composition containing flumetralin and prohexadione-calcium to cotton.

The invention provides an application of a plant growth regulator composition containing flumetralin and prohexadione calcium in cotton topping.

Prohexadione calcium is a dioxygenase which is exclusively used for 2-oxoglutarate and depends on, can inhibit 3 beta-hydroxylation in gibberellin biosynthesis, is used for controlling growth (lawn) and structure and activation of gramineous crops, is similar to trinexapac-ethyl (cyclohexanedione carboxylic acid derivatives), but has low absorption utilization rate, weaker control effect and higher cost.

The inventor finds that when the flumetralin and the prohexadione calcium are combined according to a certain proportion and are jointly used for cotton topping, the flumetralin and the prohexadione calcium can not only effectively realize cotton topping and ensure the topping quality, but also improve the cotton production, greatly improve the cotton yield and/or improve the cotton fiber quality, even in the absence of obvious disease pressure.

Accordingly, the present invention provides the use of a plant growth regulator composition comprising flumetralin and prohexadione-calcium for application to the foliage and tops of cotton for cotton topping.

The application of the plant growth regulator composition containing flumetralin and prohexadione calcium in cotton topping leads to improvement of cotton production, improves cotton yield and/or cotton fiber quality, and even shows a synergistic effect under the condition of lacking obvious disease pressure.

The invention provides application of a plant growth regulator composition containing flumetralin and prohexadione calcium in cotton topping, wherein the flumetralin and the prohexadione calcium are applied in a proportion of synergistic effect of the plant growth regulator composition in improving cotton yield and/or improving cotton fiber quality. The weight ratio of the flumetralin to the prohexadione calcium is 50:1-1:1, preferably 50:1-5:1, more preferably 50:1-8:1, more preferably 45:1-8:1, more preferably 40:1-8:1, more preferably 35:1-8:1, more preferably 30:1-8:1, more preferably 28:1-8:1,

more preferably from 25:1 to 8:1, more preferably from 20:1 to 8:1, more preferably from 18:1 to 8:1, more preferably from 15:1 to 8:1, more preferably from 12:1 to 8: 1.

The weight ratio of the flumetralin to the prohexadione calcium can also be 50:1, 49:1, 48:1, 47:1, 46:1, 45:1, 44:1, 43:1, 42:1, 41:1, 40:1, 39:1, 38:1, 37:1, 36:1, 35:1, 34:1, 33:1, 32:1, 31:1, 30:1, 29:1, 28:1, 27:1, 26:1, 25:1, 24:1, 23:1, 22:1, 21:1, 20:1,

19:1、18:1、17:1、16:1、15:1、14:1、13:1、12:1、11:1、10:1、9:1、8:1、7:1、6:1、5:1、4:1、3:1、2:1、1:1。

The plant growth regulator composition comprises flumetralin, prohexadione-calcium and agriculturally acceptable auxiliaries and/or carriers.

The plant growth regulator composition contains flumetralin, prohexadione-calcium, aliphatic alcohol with 8-10 carbon atoms and agriculturally acceptable auxiliary agents and/or carriers. The aliphatic alcohol is preferably decyl alcohol or 2-ethylhexyl alcohol.

The plant growth regulator composition contains flumetralin, prohexadione-calcium, a sodium hydroxide aqueous solution with the concentration of 2-5 percent, and agriculturally acceptable auxiliaries and/or carriers.

In the plant growth regulator composition, the sum of the mass of the flumetralin and the prohexadione calcium accounts for 5-50%, preferably 8-45%, more preferably 10-40%, and even more preferably 15-40% of the plant growth regulator composition. If the plant growth regulator composition is in the form of a concentrate that needs to be diluted with water before use, it will contain a higher amount of active ingredient than a composition that can be used without dilution.

In the plant growth regulator composition, the sum of the mass of the flumetralin and the prohexadione calcium accounts for 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13% of the plant growth regulator composition,

14％、15％、16％、17％、18％、19％、20％、21％、22％、23％、24％、25％、26％、27％、28％、29％、30％、31％、32％、33％、34％、35％、36％、37％、38％、39％、40％、41％、42％、43％、44％、45％、46％、47％、48％、49％、50％。

In the plant growth regulator composition of the present invention, the aliphatic alcohol may account for 5% to 50%, preferably 10% to 40%, by mass, of the plant growth regulator composition, and may also account for 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50% by mass of the plant growth regulator composition.

In the plant growth regulator composition of the present invention, the amount of the 2% to 5% aqueous sodium hydroxide solution is 5% to 25%, preferably 10% to 20%, and may be 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25% by mass.

Furthermore, the plant growth regulator composition can be prepared into any agriculturally acceptable dosage form, and preferably prepared into effervescent tablets, water dispersible granules, suspending agents, suspoemulsions, emulsion in water, missible oil, ultra-low volume liquid agents, electrostatic oil agents, dispersible oil suspending agents, granules, oil suspending agents or dry suspending agents.

The above dosage forms are conventional in the art, and the methods for preparing the dosage forms are well known to those skilled in the art, and the agricultural adjuvants and/or carriers and the amounts thereof used to prepare the above dosage forms are also well known to those skilled in the art, and can be found, for example, in the "agricultural dosage form processing technology" (edited by Liu Walsh, second edition). Adjuvants and/or carriers used include, for example, but are not limited to, solvents, co-solvents, emulsifiers, dispersants, wetting agents, wall materials, binders, film-forming agents, disintegrants, thickeners, antifreeze, stabilizers, pH adjusters, warning colors, fillers and/or carriers, and the like.

In the composition of the present invention, the solvent may be selected from: benzene, toluene, xylene, acetone, dimethylformamide, dimethyl sulfoxide, chloroform, dichloromethane, cyclohexane, cyclohexanone, N-methylpyrrolidone, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, cyclohexanol, methyl glycol ether, ethyl glycol ether, petroleum ether, acetonitrile, paraffin, tetrahydronaphthalene, isophorone, soybean oil, cottonseed oil, and the like.

The cosolvent can be selected from: one or more of methanol, ethanol, isopropanol, n-butanol, etc.

The emulsifier can be selected from: sodium lauryl sulfate, sodium dodecylbenzenesulfonate, calcium dodecylbenzenesulfonate, nonylphenol polyoxyethylene ether phosphate amine salt, castor oil polyoxyethylene ether phosphate amine salt, tristyrylphenol polyoxyethylene ether phosphate amine salt, polyoxyethylene fatty amide, alkylpyridinium salt, alkylisoquinolinium salt, dialkylmorpholinium salt, oleamide sulfonate, diisopropylnaphthalenesulfonate, lignosulfonate, one or more of a naphthalenesulfonate formaldehyde condensate, styrylphenyl polyoxyethylene ether, phenethylphenol polyoxyethylene polyoxypropylene ether, nonylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene block polymer, alkylphenol formaldehyde resin polyoxyethylene ether, polyoxyethylene sorbitol fatty acid ester, sorbitan monostearate polyoxyethylene ether, polyoxypropylene glycol monofatty acid ester and the like.

The dispersing agent can be selected from: one or more of lignosulfonate, sodium p-hydroxyphenyl lignosulfonate, fatty alcohol polyoxyethylene ether sulfate, alkylnaphthalene sulfonate, naphthalene sulfonic acid formaldehyde condensate sodium salt, dodecyl trimethyl ammonium salt, alkyldimethylbenzyl ammonium salt, polyoxyethylene lauryl ether phosphate, styrene-maleic acid salt copolymer, fatty alcohol polyoxyethylene ether phosphate, nonylphenol polyoxyethylene ether, glycerin fatty acid polyoxyethylene ether, polyoxyethylene alkylaryl ether, polyoxyethylene lanolin alcohol, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glyceryl monofatty acid ester, alkylolamide, polyoxyethylene alkylamine, and the like.

The wetting agent can be selected from: one or more of sodium lauryl sulfate, calcium dodecylbenzenesulfonate, sodium isooctyl succinate, sodium oleoyl methyltaurate, sodium polyoxyethylene lauryl ether carboxylate, sodium lauroyl sarcosinate, sodium N-lauroyl glutamate, dioctyl sulfosuccinate, polyoxyethylene alkylaryl ether phosphate, trisiloxane polyoxyethylene ether, tristyrylphenol polyoxyethylene ether, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene polyether formaldehyde condensate, alkylphenol polyoxyethylene ether phosphate, polyoxyethylene fatty acid ester, higher fatty acid glyceride, sorbitan fatty acid ester, and the like.

The adhesive can be selected from: one or more of starch, polyvinylpyrrolidone, carboxymethyl cellulose, carboxyethyl cellulose, gelatin, gum arabic, xanthan gum, etc.

The film forming agent can be selected from: one or more of polyvinyl alcohol, polyvinyl acetate, polyacrylamide, carboxymethyl cellulose, hydroxypropyl cellulose, acacia, gelatin, xanthan gum, starch, etc.

The disintegrating agent can be selected from: one or more of urea, sodium sulfate, calcium sulfate, sodium bicarbonate, ammonium sulfate, magnesium chloride, sodium chloride, and the like.

The thickening agent can be selected from: one or more of acacia, xanthan gum, gelatin, polyvinyl alcohol, magnesium aluminum silicate, sodium carboxymethylcellulose and the like.

The defoaming agent can be selected from: butyl phosphate, isobutyl phosphate, n-octanol, silicone, and the like.

The antifreezing agent can be selected from: one or more selected from ethylene glycol, propylene glycol, glycerol, etc.

The stabilizing agent can be selected from: triphenyl phosphite, N-soybean oil-based trimethylene diamine, dialkyl succinate sulfonate, epichlorohydrin, butyl glycidyl ether, and the like.

The warning color can be selected from: basic rose essence, basic violet 10, basic violet 49, acid red 51, acid red 52, acid red 14, acid blue 9, acid yellow 23, basic red 10, basic red 108.

The preservative can be selected from: benzoic acid, sodium benzoate, and the like.

The pH regulator can be selected from: hydrochloric acid, sodium hexametaphosphate, sodium citrate, sodium bicarbonate, sodium hydroxide, hydrogen oxidant, triethanolamine, etc.

The filler and/or carrier may be selected from: one or more of attapulgite, diatomite, kaolin, white carbon black, bentonite, montmorillonite, calcium carbonate, zeolite, acid clay, white clay, pyrophyllite, talc, calcite, etc.

The present invention has surprisingly found that the plant growth regulator composition according to the present invention may further comprise an aliphatic alcohol having 8 to 10 carbon atoms. The aliphatic alcohol is preferably decyl alcohol or 2-ethylhexyl alcohol. The content of the aliphatic alcohol accounts for 5% -50% of the plant growth regulator composition. The addition of the aliphatic alcohol obviously improves the cotton yield and improves the cotton fiber quality.

The present invention also surprisingly found that the plant growth regulator composition of the present invention may further comprise an aqueous solution of sodium hydroxide with a concentration of 2% to 5%. The content of the 2-5% sodium hydroxide aqueous solution accounts for 5-25% of the plant growth regulator composition. The addition of the aqueous sodium hydroxide solution also significantly increased cotton yield and improved cotton fiber quality.

The present invention relates to a method of treating crops comprising applying to the foliage of said crops a plant growth regulator composition comprising flumetralin and prohexadione-calcium according to the invention.

The present invention relates to a method for treating cotton plants, which comprises applying the plant growth regulator composition comprising flumetralin and prohexadione-calcium according to the invention to the foliage and tops of the cotton plants.

The present invention provides a chemical method for cotton topping comprising applying a plant growth regulator composition comprising flumetralin and prohexadione-calcium to cotton.

The present invention provides a chemical method for cotton topping comprising applying a plant growth regulator composition comprising flumetralin and prohexadione-calcium to the tops and foliage of cotton.

The invention provides a chemical method for cotton topping, which is to apply a plant growth regulator composition containing flumetralin and prohexadione calcium to the top and the leaf of cotton from the first occurrence of tiny flower buds to the full-bloom stage.

The present invention also provides a method of improving the yield of a cotton plant crop and/or the quality of cotton fiber comprising applying to cotton a plant growth regulator composition comprising flumetralin and prohexadione-calcium.

The present invention also provides a method of improving the yield of a crop of cotton plants and/or the quality of cotton fiber comprising applying a plant growth regulator composition comprising flumetralin and prohexadione-calcium to the tops and foliage of cotton.

The present invention also provides a method of improving the yield of a crop of cotton plants and/or the quality of cotton fiber, the method comprising improving the yield of a crop of cotton plants and/or the quality of cotton fiber by: (i) diluting a concentrate of a plant growth regulator composition comprising flumetralin and prohexadione-calcium in a suitable carrier such as water; (ii) the diluted composition is applied to the top and foliage of cotton plants.

The rate of application of the plant growth regulator compositions of the present invention can be in a wide range. It is usually applied at an application rate of from 0.001kgai/ha to 4kg ai/ha, in particular from 0.01kg ai/ha to 2kg ai/ha, in particular from 0.1kg ai/ha to 1kg ai/ha, in particular from 0.2kg ai/ha to 0.8kg ai/ha.

The flumetralin and prohexadione-calcium of the invention may be applied simultaneously or sequentially in any order. If administered sequentially, the components may be administered in any order over a suitable time frame, e.g., no more than 1 month, no more than 1 week, or no more than 24 hours between the time the first component is administered and the time the last component is administered. Suitably, the ingredients are dosed over a period of hours. If both flumetralin and prohexadione-calcium are administered simultaneously, they may be administered separately or in a tank mix or in a pre-formulated mixture.

The first application of the plant growth regulator composition of the present invention to the leaves of cotton plants is from the first appearance of tiny flower buds or the first flowering to the full-bloom stage. Subsequent application of the composition of the invention or subsequent separate application of the flumetralin or prohexadione calcium may be carried out as desired. If subsequent administrations are employed, the administrations are preferably separated by a period of about 10 to 21 days. The time at which buds first appear or flowers first and the time required for the first application or subsequent application of the plant growth regulator composition will vary based on a variety of factors including the area, climate, cotton variety.

The cotton variety may be a transgenic variety. Including herbicide-resistant cotton varieties, such as glyphosate-, glufosinate-or bromoxynil-resistant cotton varieties; cotton varieties tolerant to harmful insects, in particular to beetles and dipterans; cotton variety with anti-pathogenic substance and selective effect.

The key to the cotton topping effect is time and method. Premature topping, easy clustering of proud buds and heavy field shading; too late topping, increase of ineffective buds, delay boll opening and maturity, and result in poor yield and quality of cotton. The topping time is determined mainly according to the growth vigor, the soil fertility, the density, the variety of cotton plants, the accumulated temperature of the local later period, the initial frost period and other factors.

When the plant growth regulator containing the flumetralin and the prohexadione calcium is applied to cotton topping, two modes of manual spraying and mechanical spraying can be adopted. Mechanical spraying is particularly preferred plant protection unmanned aerial vehicle spraying.

A plant growth regulator composition comprising flumetralin and prohexadione calcium according to the invention may optionally comprise one or more additional pesticides such as insecticides, nematocides, fungicides or herbicides or additional plant growth regulators. This can further increase cotton yield and/or improve cotton fiber quality by controlling insect or nematode pests, fungal diseases and weeds.

Other active ingredients such as herbicides, other plant growth regulators, other fungicides, insecticides, acaricides and nematicides may be present in the concentrate of the present invention or may be added as a tank mix formulation of the composition of the present invention. In addition, these other active ingredients may be applied to the seed, plant locus or plant propagation material before or after application of the plant growth regulator composition of the invention.

The structural characteristics of the cotton fibers are embodied by the main quality indexes of the cotton fibers. The main influences on the spinning performance are length, fineness, maturity, micronaire value, reflectivity, yellowness and the like.

The cotton fiber is divided into length grades according to the length of the cotton fiber, and the cotton fiber is divided into seven length grades of 25-31 mm by taking 1 mm as a grade pitch.

Fiber alignment is usually expressed as an alignment higher than 90%; a degree of alignment below 80% indicates that the fibers are not aligned.

The micronaire value is a comprehensive index reflecting the fineness and maturity of cotton fibers, and the larger the numerical value, the thicker the cotton fibers are, the higher the maturity is. Micronaire was rated in three grades, A, B, C. Grade B is the micronaire standard grade. A is high, the numerical range is 3.7-4.2; b is a standard component with a numerical range of 3.5-3.6 or 4.3-4.9; c is discount level, the value range <3.4 or > 5.0.

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

(1) according to the invention, when the flumetralin and the prohexadione calcium are combined and are jointly used for cotton topping, the synergistic effect is shown; the method not only can effectively realize cotton topping and ensure the topping quality, but also can improve the cotton production, greatly improve the cotton yield and/or improve the cotton fiber quality, even in the absence of obvious disease pressure;

(2) according to the invention, the aliphatic alcohol with 8-10 carbon atoms or the sodium hydroxide aqueous solution with the concentration of 2% -5% is additionally added on the basis of the combination of the flumetralin and the prohexadione calcium, so that the cotton yield can be further improved, and the cotton fiber quality can be further improved.

Detailed Description

The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.

Formulation examples