Application techniques of different Chemical Control agents in Cotton

Cotton chemical control is the use of chemical control means to shape cotton into an ideal plant type and create a population with high light efficiency, which can make the plant grow healthily, reduce the occurrence of diseases and insect pests, improve cotton yield and improve cotton quality. However, there are many chemical control agents at present, and the correct use technology should be adopted according to different agents in order to achieve better results.

First, propranolol. At present, thalidomide is widely used in cotton chemical control, and the effect is ideal. It can reduce the plant height of cotton, reduce the number of fruit branches, promote the transfer of photosynthesis to reproductive growth, reduce the shedding of cotton bolls, increase the number of bolls, and coordinate the contradiction between ontogeny and population development. Cotton is used for the first time in the bud stage with 0.51 grams of water per mu, which is beneficial to control up and down, stabilize growth and increase buds. The second time in the early flowering stage, 1.51 grams per mu with 30 kilograms of water can prevent prosperity and increase bolls. The third time in the flower and boll stage, 34 grams per mu with 30 kilograms of water, focusing on spraying plant crown, fruit node top, in order to shape a good plant type. For the fourth time in the later stage, if there is a phenomenon of "running high", it can be re-controlled, and the mu is capped with 34 grams to facilitate the control of late buds, shorten the upper fruit nodes, and prevent the increase of ineffective fruit nodes and superfluous buds.

Second, the element that helps to strengthen. Spraying 25% zhuangsu 5 ml / mu with water 40 kg / mu in full bud and early flowering stage and spraying 10 ml each in full flowering stage can effectively control the overgrowth of cotton and reduce the shedding of buds and bolls and the occurrence of diseases in boll stage.

Third, chitin. It can be used in the whole growth period of cotton. Foliar spraying with 600 rain 800 times liquid can enhance the stress resistance and disease resistance of cotton, especially to prevent cotton seedling disease, Verticillium wilt and Fusarium wilt.

Tetra and triacontanol. Soaking seeds with 0.1 mg / kg triacontanol for 8 hours could increase the germination energy and germination rate of seeds. Spraying 0.1 mg / kg triacontanol solution at full flowering stage and late flowering stage could reduce bud and boll shedding.

Ethephon. Ethephon is mainly used in all kinds of late-maturing cotton fields and cotton fields that need early stubble, but it is not suitable for cotton fields with normal boll opening and low yield per unit area. The temperature is higher than 20 degrees in a few days after spraying, and only a temperature higher than 20 degrees can decompose and release ethylene, and the boll period of the upper cotton boll is more than 40 days, and it is appropriate to spray in the northern cotton area about 20 days before the dry frost period. Generally use 40% ethephon 300 murine 800 times liquid 60 kg per mu, use ethephon to promote ripening, must pay attention to the application liquid directly attached to the bell body, minimize leaf interception, can not be mixed with alkaline pesticides, add 0.2% neutral detergent as wetting agent, the effect is better, the seed field can not be used.