Cotton chemical control is the use of chemical control means to mold cotton into an ideal plant type and create a high luminous efficacy group. In this way, the plants can grow robustly, reduce the incidence of diseases and insect pests, increase cotton yield, and improve quality. However, currently there are many chemicals that are controlled, and correct use techniques should be adopted according to different drugs in order to achieve better results.
First, polycondensation amine. At present, the application of dildo-amine in the control of cotton is relatively extensive, and the effect is also ideal. It can reduce cotton plant height, reduce the number of fruit branches, promote photosynthesis to reproductive growth and transfer, reduce boll shedding, increase the number of bolls, and harmonize the contradictions of individual development and population development. Cotton used diamine for the first time in four applications. In the bud stage, mu using 0.51 grams of water 20 kg, is conducive to control on the promotion of stable growth. The second time in the initial flowering period, mu 1.5kg 30 kg water, can prevent Wang Ling bell. The third time in the flowering and bolling period, 30 grams of water was used for 34 grams per mu, and the top of the sprayed plant was the crown and the top of the fruit section in order to help shape the good plant type. For the fourth time in the later period, if there is a "running high" phenomenon, it can be re-controlled, with 34 grams of mu for capping, in order to facilitate the control of the buds, shorten the upper fruit section, prevent the increase of no effect festivals, and axillary buds.
Second, help the prime factor. Sheng Lei period and early flowering period, with 25% per mu, 5 milliliters of water, 40 milliliters of milk, and 10 milliliters of spray at full flowering time, can effectively control the length of cotton and reduce the occurrence of boll shedding and boll disease.
Third, chitin. It can be used during the whole growth period of cotton. The 600-800 times liquid foliar spraying can increase the resistance and disease resistance of cotton, especially for the seedling disease, verticillium wilt and blight of cotton. effect.
40,30 alkyl alcohol. Seed soaking for 8 hours with 0.1 mg/kg triacontanol increased the germination potential and germination rate of the seeds. Spraying 0.1 mg/kg triacontanol solution at the flowering stage and at the end of flowering stage could reduce the shedding of the bells.
Fifth, ethephon. Ethephon is mainly used for all kinds of late-maturing cotton fields and cotton fields that require early unloading. It should not be used for cotton fields that have normal boll opening and very low yields. The temperature of the spray should be higher than 20 degrees for only a few days after the drug is applied, and only higher than 20 The degree of temperature can decompose and release ethylene and play a role, and the boll period of the upper boll is more than 40 days. The northern area of ​​cotton is suitable for spraying about 20 days before the dry frost period comes. Generally, 40% of ethylene dihydrate is used per mu. 300 - 800 times liquid 60 kg, using ethephon ripening, must pay attention to the application of liquid directly attached to the boll body, to minimize the cutoff by the blade, can not be mixed with alkaline pesticides, when used plus 0.2% neutral detergent for Humidifiers have better effects and cannot be used in seed fields.
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