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. Summer drought leads to premature senescence of cotton. No rain in Fuli should be watered in time. Interlaced ditch irrigation should be used and flood irrigation should be avoided. In the cotton field which may have premature senescence in the pruning, it is no longer fine pruning after August, and some superfluous buds can be retained to ensure that there are enough vegetative organs in the cotton field for photosynthesis.
Foliar fertilizer should be sprayed immediately after topping, once every 8-10 days, first nitrogen and then potassium, which can be sprayed until August 10-15. Once fattened, it is difficult to achieve the top of autumn peach. In the later stage, sufficient spraying of available potassium fertilizer twice is very important for bolls, bolls and bolls in the upper part, and potassium is indispensable for the development of cotton fiber, so potassium application can improve lint percentage, especially in years with heavy rainfall in summer days, especially for low-lying cotton fields. Potassium spraying is more necessary. After the end of July, it can also be combined with pest control, spraying with 2-3% urea and 0.2% potassium dihydrogen phosphate every 7-10 days. In case of rain in summer days, ploughing should be broken in time to facilitate root growth, and ploughing should not be too deep to avoid root damage.
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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. After the impurities are precipitated, the clarification solution should be poured out slowly, diluted with water and sprayed. At the same time, Tianfengsu or Shuofeng 481 can be added properly.
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Plastic film mulched cotton should be prevented early from strong lodging and premature senescence.
In the process of planting plastic film cotton, many cotton farmers are prone to some technical mistakes, resulting in cotton plant lodging and premature senescence. The former is caused by uncovering the film too late, while the latter is caused by untimely or insufficient topdressing. Therefore, the following measures should be taken in time: timely removal of plastic film. In the early stage, the absorption capacity of plastic film mulched cotton to fertilizer and water is much stronger than that of direct seeding cotton. If plastic film is removed timely and field management is strengthened, plastic film mulched cotton can give full play to its advantages. If the plastic film is uncovered late or not, it is not conducive to the root system of cotton plants. Make most of the roots distributed in the upper layer of the soil.
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