Measures to prevent premature senescence of cotton
Now is the critical period of cotton bud and boll management. in order to avoid premature senility, fellow villagers should strengthen management and pay attention to spraying foliar fertilizer. the specific methods are as follows: urea 22, potassium dihydrogen phosphate 1, or potassium fulvic acid 20-30 grams, naphthalene acetic acid 3-5 milliliters, Tianyi 30 grams, in order to prevent burns of leaves, the above fertilizers and chemicals should first be hydrated into mother liquid with a small amount of water, and then put into the sprayer and sprayed with water. One mu of land is sprayed with two sprayers every 7-10 days until September 20 of the Gregorian calendar.
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Prevention of premature senescence of cotton in the later stage
Premature senescence of cotton plant means that when the growth center turns to reproductive organs after the cotton plant enters the flower and boll stage, if the cotton plant is malnourished and the bud and boll compete with the vegetative organs for the organic nutrients produced by leaves, the vegetative growth will be more restrained. After this kind of cotton plant bears several cotton bolls in the middle and lower part, the upper part of the cotton plant appears the phenomenon of vegetative growth decline, such as top tip, hard hair, red stem to the top, thin and yellow leaves, which is the premature senescence of cotton plant. Premature senescence of cotton plants generally occurs in stiff soil, poor fertility and poor root growth.
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Main causes and Preventive measures of premature Senescence of Cotton under drip Irrigation
First, the main reasons for the premature senescence of cotton planting with high density. Variety factor varieties are not resistant to premature senility. In recent years, there are many varieties of cotton, some varieties of aging, degradation, some varieties of their own disease resistance and early aging resistance is poor, or not suitable for high-density planting, resulting in premature senescence of cotton. two。 Environmental factors the suitable sowing time of precocious cotton in ① temperature is 5 cm ground temperature and 12 ℃. If sowing is too early or cold injury occurs at seedling stage, the root system function of cotton is easily damaged due to low air temperature, slow root growth and serious disease.
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