June to July is the time when rainwater is concentrated in our province, and it is easy to cause cotton floods. The cotton of our province is mainly concentrated in the Dongting Lake area where the terrain is relatively low. Floods and floods occur every year, but at different levels. When cotton suffers from severe waterlogging, how can it reduce losses?
According to the author's years of practice in the Lake District, the tolerance of cotton to waterlogging has gradually increased from the seedling stage. The survival of transplanted cotton seedlings can withstand water for 2 to 3 days without death. Bud stage cotton is generally not easy to flood the top, once encountered in the 1980s flooded top 2 days, ridge surface flooded 15 to 20 cm 7 days without the record of dead seedlings. In addition, the tolerance of cotton seedlings to waterlogging has a great relationship with soil quality and fertilization. Sandy land is generally easy to die, muddy ground is not easy to die; stained easily after fertilization dead seedlings, thin seedlings are not easy to meet seedlings dead seedlings.
In the middle and late June, cotton has entered budding stage. At this time, the ability of cotton to withstand waterlogging has been greatly enhanced. It is generally not easy for the whole plant to die. In the days when the top dead center is absent, the whole plant leaves can die and die. However, most of the main stalks can germinate. At this time, the remedy method of cutting off the main culm can be adopted to promote the budding and recurrence of the main stem base. The deadline for cutting off the main culm is July 20. Before this, the culm is cut. The temperature in the later period is high, and the frost period is late. Generally, the output can reach 200 kg of seed cotton, but the cotton harvest period will be relatively late. Cutting culms after July 20 has a greater risk for production.
After cutting off the main stalk, the main point of the pipe is: drain water as early as possible. Under the premise of draining water, the earlier the cutting time, the better. The height of the stalk stalk is about 15 cm. After germination, generally there is 1 plant per plant (2 plants can be left around the missing plant. Do not leave more). Timely use of dilute amines to adjust. When the buds grow to about 10 centimeters, the first dilute amine is sprayed with 1 g per acre; a large amount of buds are used once more, and the dosage per acre is 1.5-2 grams; in the initial boll period, it is 2.5-3 grams per acre. . Pay attention to cotton stalks when fertilizing requires less fertilizer than normal cotton, usually when the big buds are fertilized once, use 45% compound fertilizer 20 kg per mu; there are 1 to 2 when the bell is fertilized once, use urea per mu 20 kg, plus potassium chloride 10 kg.
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