Technical points of cotton flower and bell period management
1. Topdressing: 20-30 kg/mu of nitrogen plus potassium compound fertilizer, or 10-15 kg of urea plus 10-15 kg/mu of potassium chloride;
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2, foliar spray fertilizer: potassium dihydrogen phosphate 150 g / per acre plus red A boron 700-1000 times liquid, spray once every 10-15 days, can be combined with spraying pesticides;
3. Prevention and control of cotton bollworm: In early July and early August, it is the hatching period of cotton field 1 and cotton field 2 generations of cotton bollworm larvae, which is also suitable for control. Insecticides can be selected: Kangkuan, Kangge, Daotong, Chloramphenicol Formamide, chlorfenapyr I-III, diflubenzuron, butyl thiocarbamate, phoxim, etc.;
4, pruning: July 15-20 topping, generally to retain 12-14 fruit branches; before August 20th hit the group, remove all the young buds;
5, chemical control: cotton into the flowering and bolling period, is also the key period of chemical control, foliar spray mites, at the end of June can grasp 1-2 g / mu in early July, 2-3 g / mu in late July, mid-August 5 grams or more / acre;
6, disease prevention: sudden drop of heavy rain after high temperature, some plants in the lower leaves appear baked paste-like focal edge, light can be self-healing, heavy leaves will affect the ringing, can be combined with the control of cotton bollworm to add methyl thiophanate, carbendazim , carbendazim, antibacterial nitrile, etc.;
7. Pay attention to the prevention and control of Fuxi: In the general year, Fuxi appears in the early July. If it is difficult to control after the late July, it should be prevented early. It can be used with imidacloprid, nicotinic acid, acetamiprid, pymetrozine. Omethoate, etc.;
8, weeding: even rainy days weeds are prone to disasters, we must diligently plough, spray closed herbicide pendimethalin or spray paraquat, pay attention to protective spray;
9. Drainage: Since the rain has entered since June, the cotton is afraid of cockroaches. The drainage ditch should be dug in advance, and there should be no water in the field after heavy rain;
10, membrane and soil: combined with fertilizer activities and other agricultural activities, remove the mulch. Combine the drainage ditch to cultivate the cotton plant.