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 a timely manner:
Remove the mulch at the right time. In the early stage, the absorption capacity of fertilizer and water of plastic film mulched cotton is much stronger than that of direct seeding cotton, if plastic film can be removed timely and field management can be strengthened, plastic film mulched cotton can give full play to its advantages; if plastic film is uncovered late or not, it is not conducive to the root system of cotton plants. as a result, most of the roots are distributed in the upper layer of the soil, the supporting capacity of cotton plants is poor, and it is very easy to lodge. Therefore, the plastic film must be removed at the right time to promote root ligation, and the most suitable time to uncover the film is the early flowering stage.
Apply fertilizer quickly. As the development process of plastic film cotton is 20 to 30 days earlier than that of direct seeding cotton, all management measures should be taken earlier, especially if Hualing fertilizer is applied quickly, 10 kg of urea or 10 to 15 kg of ternary compound fertilizer can be applied per 667 square meters. Potassium-deficient cotton fields should also be increased by 5 to 10 kg of potash fertilizer for every 667 square meters.
Promote the balanced growth of cotton plants. Plastic film cotton as a result of rapid development, easy to grow crazy, we must take corresponding measures to make its balanced growth: 1, after entering the full bud stage, every 667 square meters with 2 to 3 grams of metrode, or 8 to 12 milliliters of zhuangsu, plus 40 kg of water spray. 2. Pay attention to topdressing in time after spraying regulator. After spraying the regulator, the cotton leaf color soon turned to thick green, but at this time can not ignore the latent problem of de-fertilization, the fertilizer should still be topdressing. At the same time, we should also pay attention to remove the residual film after opening the film, so as not to affect the cultivation of soil in the middle tillage and the management of the following crop.
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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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Causes and Control Countermeasures of premature Senescence of Cotton under drip Irrigation
Since 2002, the 141 regiment has popularized the cotton drip irrigation planting technology in a large area, the per unit yield has been increased year by year, and the economic benefit is remarkable. However, in recent years, there are different degrees of premature senescence in cotton fields, resulting in poor bolting, shelling, stiff tip increase and lower quality. First, the causes of premature senility. In the cotton fields with long continuous cropping years and short cotton planting years, most of the cotton had green branches and green leaves; the old cotton fields with continuous cropping for more than 10 years grew well in the early stage, but once they encountered low temperature and overcast and rain in the middle and later stages, the symptoms of leaf red leaves occurred in a large area.
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