(a) choose a good variety. The selection of varieties should focus on strong stress resistance and stable yield and high yield. Both precociousness and potential for high yields, and rapid recovery after disasters, these varieties should be the first choice.
(b) sowing in late planting period. Reduce the impact of extreme weather on cotton seedlings and avoid seedling risk. Sooner or later, the maturity of cotton does not depend on sowing sooner or later. Do not look at the temperature and sow immediately. Before the temperature is stabilized, there will be cooling after an abnormal rise in temperature. It is necessary to rely on the safe use of herbicides, nutrient dressing, and seedling cultivating and other measures to promote cultivation. Seedling strong.
(3) According to the characteristics of different varieties and soil fertility, it is reasonable to leave seedlings. During the budding period, the plant height was controlled and the plant height was controlled. Each fruit plant had few fruit branches, and the tops were promptly topped. Do not magnify the trees. The task of tying bells was shared by individuals and groups.
(IV) The birth process to be mastered: Mid-South and Northwest Yunnan should normally bud in early June, flower in early July, finish topping on July 15-20, and remove buds that have not yet bloomed on August 20th. The flowering period is moved forward to avoid the extreme weather risks such as low temperature, drought, wind, and heavy rain in the later period, so that the cotton bells will be concentrated in the 40-day period from July 10 to August 20. Cutting flowers early can also promote the development of early autumn peaches. A few years of practice have proved that the boll weight of the end of August significantly reduced, late peach risk, try not to stay.
(5) Coordinating the relationship between nitrogen, phosphorus and potash fertilizers. Phosphorus can reduce nutrient and promote early maturation. Potassium can prevent disease and prevent premature aging. These two kinds of fertilizers can enhance the stress resistance of cotton plants and should be applied in the base fertilizer. Nitrogen fertilizer should focus on the flowering and ringing of cotton plants. Shi, in the seedling and bud control application, to prevent the trophic body is too large, affecting the normal flowering and bolling cotton.
(six) to use good promotion and control measures. In addition to relying on measures such as water, fertilizer, and cultivating cotton, the control of cotton depends on growth regulators. When cotton plants are affected by unfavorable conditions causing slow growth or even stagnation, or when cotton growth is caused by wind picking or other attacks, auxin (also known as gibberellin, 920) is required to promote its growth; auxin can only accelerate cell division. Does not provide nutrition to cotton plants, so it is necessary to use nutrients in combination. Sometimes cotton plants grow fast, but nutrition is not enough, and it is not contradictory to need to spray both ghrelin and nutrients.
(7) Strict control of pests and diseases in a timely manner. Cotton seedling disease, keratoderma, second-generation cotton bollworm, cotton blind pupa, cotton red spider, late cotton fleas, rotten bell problems, boron deficiency problems, etc., have aggravated in some cotton areas in recent years. Once pests and diseases begin to occur, they must be removed in strict and timely manner. Time can't be delayed. Blind blending and increasing doses should also be avoided to prevent the normal birth of cotton.
(8) Improve and simplify techniques such as pruning. The frequent occurrence of extreme weather has raised new issues for cotton pruning technology, which is also an important means of regulating cotton. The so-called no-pruning method that retains all the vegetative shoots is not desirable and is not conducive to the premature ripeness of the cotton. In the case of reaching a predetermined density and no shortage of seedlings, it is appropriate to leave no vegetative shoots; after the cotton is affected, as the season allows, it is necessary to first promote the growth of vegetative plants, and to grow to a certain degree, it must be trimmed to retain only effective buds. The heart is too late. In addition, it is necessary to combine cultivator for ditching soil, so that the drought can be poured, and the ridges can be discharged, and lodging can be prevented.
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