Foliar spraying of Cotton to prevent premature senescence
In the later stage of cotton growth, the root activity gradually aged and the ability of absorbing fertilizer and water decreased correspondingly. Spraying fertilizer solution was adopted to promote the absorption and utilization of fertilizer, prolong the functional period of leaves, improve the root activity and increase the boll weight.
The suitable concentration of fertilizer solution is 1% urea, 50 kg water and 0.5 kg urea; potassium dihydrogen phosphate and calcium superphosphate should be 1% Mel 1.5%. Calcium superphosphate should be soaked for 24 hours, and the clarification solution should be poured out slowly after precipitating impurities. Dilute it with water and spray it. At the same time, Tianfengsu or Shuofeng 481 can be added properly, which can have a significant effect. Generally after 4: 00 p. M., the fertilizer liquid is sprayed on the middle and upper leaves of the cotton plant, both positive and negative. Each time 30 kg fertilizer solution was sprayed per mu, once every 7-10 days, a total of 3-4 times.
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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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Beware of cotton premature senescence in summer
After the emergence of premature senescence of cotton, remedial measures are of little significance, focusing on prevention. The first ten days of August is the peak period of cotton flowering and bolling. if the vegetative growth and reproductive growth are well coordinated, it is not easy to senescence prematurely. The earlier the occurrence of premature senility, the more serious the yield reduction. In serious years, premature senility occurred in the middle and late August. How to prevent cotton premature senescence and increase cotton yield is an urgent problem to be solved in cotton production. Here are some measures to prevent cotton premature senility. Pay attention to the way of watering. The summer drought leads to the premature senescence of cotton. If there is no rain in Fuli, it should be watered in time.
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