To protect this year cotton yield increase, according to different region climate characteristic and actual condition, jointly with the ministry of agriculture national agricultural technology extension service center cotton expert committee to formulate the "instructional advice on the middle and later periods of the cotton production technology of 2017.

-- northwestern cotton area

In general, cotton grows well, and it is important to strengthen the management of the field in late stage.

1. Fertilizer management. The normal cotton field is 3-4 drip irrigation in 8-september, and the strength of the fertilizer is medium. The premature aging cotton field should strengthen the management of the fertilizer, the mu of potash fertilizer 2-3 kg, the postponement time; In the late mature cotton fields to control the water, early stop water.

2. Pest control. Mainly aimed at the control of the three - 4-4 - generation cotton bollworm, autumn aphid and red spider. The infected cotton fields should be used in a timely manner and spray control.

3. Collection management. Clean up the tampons (floor film, weeds, drip irrigation belt, etc.) before harvest. Timely spraying defoliant, stay at the top of the cotton boll basic mature, boll opening rate above 40%, the temperature stability to spray at 18 ℃ ~ 20 ℃. Pay by standard, and guard against the contamination of the opposite sex.

-- the Yellow River basin

Affected by the high temperature drought, the process of cotton childbirth was more than 10 days earlier than usual. In response to the problem of premature aging of cotton fields and the problem of poor bell, the key point is to strengthen the management of cotton.

1. Fat water transportation. Use 3 % urea solution of 3 % urea solution and 0.5 % of potassium dihydrok solution for early aging cotton field, spray once every 5 to 7 days, and spray 2 or 3 times. Irrigated cotton fields, watered according to moisture. Early reinforcement of the ditch to ensure that the three trenches are unblocked, in case the cotton fields are damaged by waterlogging.

2. Field management. It is easy to develop secondary growth in the late cotton fields, and should be removed in time. The cotton bollworm has been widely used in the prevention and control of cotton bollworm this year, and the prevention and control should be strengthened. Cotton bollworm should be used to kill small pesticides (such as saidan, etc.), which can be used by the red spider. The cotton field should be used for the prevention and treatment of the polymycorrine, bacillium and methylidiomycetes.

3. Ripening and harvesting. Late mature cotton fields and need early stubble cotton fields advocate for ripening. Timely collection, with five - seven days of tufting for the appropriate, the implementation of the split, sunburn, storage, sharing, control of the opposite-sex fiber into the seed cotton. The cotton area of garlic cotton should be delayed for the time of collection. The other cotton areas should be returned to the fields or firewood as soon as possible after finishing the flowers.

-- cotton areas of the Yangtze river

The cotton growth period was delayed by about 10 days due to the effects of the early rainfall and drought. We should strengthen the management of late and late maturity.

1. The premature aging cotton field should be used for the leaf surface recovery by the middle of September with 0.03% of potassium dihydrogen phosphate. Every other week, it should be sprayed every other week. Remove the invalid fruit branch in time, the old leaf and the growth bud of the middle and lower parts, enhance the air permeability, increase the upper part of the bell rate and the bell weight, and prevent the bad bell.

Insect pest control. To closely monitor the occurrence of four generations of cotton bollworm, red bollworm, red spider, bug and tobacco lice and so on. Pay close attention to weather changes and plan ahead.

3. Ripening and harvesting. For live broadcast or late seeding late, the greening of the late, etc., can not normally crack the cotton fields, but spray the ripening of the vinyl. The normal cotton bell tufting 5-7 days collection is appropriate, collecting, drying, packaging and other links insist on dividing, sunning, storing, selling, and preventing the cross-entry of the heterosexuals, guaranteeing the quality of cotton.