"three tricks" to prevent premature senescence of growing cotton

The period from July to August is the peak period of cotton flowering and boll setting, the key period of cotton yield, and the peak of cotton fertilizer demand at the same time. If the fertilizer can not keep up with this period, the cotton will be premature senescence due to de-fatting, resulting in a large number of buds and bolls falling off, resulting in a substantial reduction in production and serious losses. Therefore, for the fertilizer-deficient cotton fields with insufficient base fertilizer or less topdressing in the front stage, where the growth potential of cotton plants is weak, the leaves become thinner and the leaf color is light, we should pay attention to the "three" yield-increasing measures to prevent the premature senescence of cotton in the peak period of flowers and bolls.

1. Apply the top fertilizer in time. The best time to apply top fertilizer is from the end of July to the beginning of August. The urea application of 7.5 kg per mu, combined with ploughing and soil cultivation, was put into the cotton rows at a depth of 10 cm, about 15 cm away from the cotton plant. This topdressing has a significant effect on increasing stamina and preventing premature senility of cotton.

2. spray foliar fertilizer at the right time. Spraying foliar fertilizer for cotton should start after topping, and replenish nutrition by spraying foliar fertilizer in time before the beginning of Autumn Festival (August 8) at the latest. After cotton entered the peak stage of flower and boll, the root activity was weakened, the root absorption capacity was poor, and the effect of soil topdressing was poor. Therefore, spraying foliar fertilizer in time in the middle and later stage of cotton has quick effect and high fertilizer effect, and has obvious effect on preventing premature senility, reducing shedding and increasing boll weight. The method of spraying foliar fertilizer: (1) single spraying foliar fertilizer: such as potassium dihydrogen phosphate, Ainong and other good foliar fertilizer. (2) 1 Mel 2% urea solution + 0.3% potassium dihydrogen phosphate solution. (3) 1% urea solution + 2% phosphate fertilizer leaching solution. (4) 1% urea solution + 2% phosphate fertilizer leaching solution + 2% potassium chloride solution. Spray 60kg per mu of mixed liquid, spray in the whole field, once every 7 days, and spray 3murmur4 times in a row. Spray after 5 p. M. on a windless day, spray all day on a cloudy day, focusing on the back of the leaves for easy absorption.

3. we should pay attention to both drought and flood prevention, and persist in fighting disasters and winning bumper harvests.

After entering the peak boll setting period, cotton is afraid of both drought and waterlogging. During the cotton flower and boll period, when there is no rain for 15 days, the cotton will suffer from drought. If the weather forecast shows that there will be no rain in the near future, it should be watered immediately, and should be irrigated through alternate ditches. Avoid flooding, prevent waterlogging caused by rain after watering, and timely shallow ploughing after watering, breaking the soil consolidation, which is conducive to preserving soil moisture.

Timely discharge of stagnant water in the field after heavy rain, no more than 24 hours at the latest to prevent waterlogging, resulting in cotton retting roots, rotten roots, leaves yellowing, falling leaves, causing a large number of buds and bolls to fall off. And timely hoe, shallow ploughing, to ensure good soil ventilation, smooth root absorption, normal growth of cotton.

For cotton fields with no stagnant water after rain and waterlogged cotton fields due to heavy soil stickiness, digging trenches and water seepage between large rows of cotton fields, reducing the surface humidity of cotton fields, improving the suitable growth environment of cotton in the later stage, and striving to produce more cotton bolls, long bolls and anti-rot bolls, so as to increase cotton production and harvest.