In order to ensure stable cotton production and income growth this year, according to the climatic characteristics and actual conditions of different production areas, the National Agricultural Technology Extension Service Center, in conjunction with the Cotton Expert Steering Group of the Ministry of Agriculture, worked out and formulated the "2017 Cotton Production Technical Guidance".

——Northwest Inland Cotton Area

The overall growth of cotton is relatively good, and it is necessary to strengthen the field management in the later stage in order to address the problems such as premature senescence, greed and late maturity in the later stage.

1. Fertilizer and water management. In normal cotton fields, 3-4 drip irrigations are performed from August to September, and the fertilizer and water intensity are mainly medium. Fertilizer and water management should be strengthened in premature aging cotton fields, 2-3 kg of potassium fertilizer should be added per acre to delay water stoppage time; fertile water should be controlled in early-growing and late-maturing cotton fields, and water should be stopped early.

2. Pest control. It is mainly targeted at the middle and late stages of 3-4 generations of cotton bollworm, autumn aphids, and red spiders. Cotton fields with severe diseases and insect pests should be treated in time with unified spray control.

3. Harvest management. Clean up obstacles (film, weeds, drip irrigation belts, etc.) in cotton fields before harvesting. Spray the defoliant at a proper time, and spray when the top boll is basically mature, the flocculation rate is above 40%, and the temperature is stable at 18 ℃ -20 ℃. Collect according to the standard, pay attention to prevent foreign fiber pollution.

——Cotton area in the Yellow River Basin

Affected by the high temperature and drought in the early stage, the cotton growth process is on average 10 days earlier than usual. Aiming at the problems of premature aging and rotten bolls in cotton fields, the management of cotton in the middle and late stages should be strengthened.

1. Fertilizer management. For premature cotton fields, use 3% urea solution and 0.5% potassium dihydrogen phosphate solution, spray once every 5-7 days, and spray 2-3 times. Cotton fields with irrigation conditions, watered in a timely manner according to the conditions. Strengthen the dredging of the ditch as early as possible to ensure the smooth flow of the three ditch to prevent the cotton fields from being damaged by waterlogging.

2. Field management. Premature senescence cotton fields are prone to secondary growth in the later stage, and new buds should be removed in time. Attention is paid to the prevention and control of cotton bollworm. This year, the gray planthopper in cotton fields has become widespread. It is necessary to increase control and control the system. Helicoverpa armigera should use pesticides that have little effect on natural enemies (such as Saidan, etc.), and red spiders can use special acaricides. Bollworm disease-heavy cotton fields should be sprayed with carbendazim, chlorothalonil, methylthiocarb, etc.

3. Ripening and harvesting. Late maturity cotton fields and cotton fields that require early stubble are encouraged to spray ethephon. Collect in time, and it is advisable to sack 5-7 days later, and implement separate collection, separate sun, separate storage, and separate sales to control the mixing of heterogeneous fibers into seed cotton. Garlic-cotton two-cooked cotton area should appropriately delay the time of drawing firewood, and other cotton areas should return the straw or pull firewood as soon as possible after the flowers are collected.

——Cotton Area in the Yangtze River Basin

Affected by the previous rainy days and high temperature and drought, the cotton growth period was delayed by about 10 days. To deal with the problems of late onset and late maturity, we must strengthen the management in the middle and late stages.

1. Topdressing pruning. Premature senescence cotton fields should be topdressed with 0.03% potassium dihydrogen phosphate and sprayed every other week before mid-September. Remove ineffective branches, middle and lower old leaves and buds in a timely manner, enhance light transmission and ventilation, increase the upper bell rate and boll weight, and prevent rotting bells.

2. Prevention of insects and disasters. Pay close attention to the occurrence of the fourth-generation cotton bollworm, red bollworm, red spider, blind bug, and whitefly, and apply pesticides as appropriate. Pay close attention to weather changes and prepare disaster prevention plans in advance.

3. Ripening and harvesting. For live broadcasts or late broadcasts, late-growing and late-ripening cotton fields that cannot be cracked normally, ethephon can be sprayed for ripening. Normal boll bolls are harvested for 5-7 days. The collection, drying, packaging, and other links insist on separate collection, separate exposure, separate storage, and separate sales. Pay attention to prevent the inclusion of heterosex fibers to ensure cotton quality.