Technical guidance on Management in the later stage of Cotton production

Editor's note: in order to ensure a stable increase in cotton production and income this year, the cotton expert guidance group of the Ministry of Agriculture put forward technical guidance for late-stage management according to the production situation and climate characteristics of different cotton areas. Now the technical opinions of the cotton area of the Yellow River basin where Hebei Province is located are summarized as follows to provide dinner for readers.

Since late July, the cotton area of the Yellow River Basin has suffered heavy precipitation and extreme high temperature for many times, and some cotton fields have signs of overgrowth of cotton plants, shedding of buds and bolls, premature senescence and so on. In view of the current cotton growth trend, we should focus on increasing early autumn peaches and preventing premature senescence, and do a good job in cotton field management in the later stage.

Scientific management of topdressing. For cotton fields with premature senility due to de-fertilization, 3% urea and 0.5% potassium dihydrogen phosphate solution should be foliar sprayed 2 times 4 times, each time at an interval of about 7 days. Water control. The cotton fields with drought should be irrigated in time, and the farmland ditches should be further cleaned and dredged in case of autumn rain and waterlogging to ensure smooth drainage. Prune. Early to beat the edge of the heart, to promote the knot of early autumn peaches, prosperous cotton fields, late stubble cotton fields and cotton fields suffering from overcast and rainy weather in autumn, the old leaves should be removed in time and the empty branches should be cut off.

Control Cordyceps sinensis. Strengthen the prevention and control of cotton field planthopper, cotton bug bug, Spodoptera litura, beet armyworm and other pests, and reduce the probability of large-scale diseases and insect pests in cotton field caused by excessive growth of cotton plants or greedy green late maturity and other factors. Malignant weeds such as tall weeds and dodder should be removed in time, and the plants should be pushed into ridges to increase ventilation and light in the field.

Chemical control, harvest, chemical control. Late maturing cotton fields and early rotation cotton fields should be accelerated by spraying ethephon according to the weather and growth. The spraying period is more than 45 days, the temperature is more than 20 ℃, and the spraying time is 20 days before the first frost period. The demonstration field of mechanized cotton picking should focus on chemical regulation according to the weather and growth situation, and should be regulated and controlled in time to do a good job of defoliation and ripening. Harvest. Normal cotton bolls should be harvested after 5-7 days, and can be harvested for 2-4 times according to the situation of boll opening. Seed cotton color should be paid attention to in harvesting, drying, packaging and storage, and the mixing of "three filaments" should be strictly controlled to ensure the quality of raw cotton.

Cotton expert guidance Group of the Ministry of Agriculture