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1. Moisture management: The water content of the leaves of Chinese cabbage is 95%-96%. The water consumption in the enveloping period is larger than that in the previous period. In the case of drought, the water must be replenished to meet the growth and development requirements of sf3. The specific requirements are: the first watering in the core period should be slow watering, and the normal irrigation will be carried out after 4-5 days, generally 5-7 days, and the watering interval for sand loam is 5-6 days; Stop watering for one week for easy harvesting.
2, fertilization management: after entering the core period to reduce mechanical damage caused by manual operation, the topdressing period should be based on the application of fertilizer with water, the first top dressing before the cold dew, the second time before the frost top dressing. During this period, the temperature gradually decreased. The fertilizer should be applied mainly to quick-acting nitrogen fertilizer. Generally, ammonium bicarbonate is used. It is advisable to apply 20-30 kg per mu, and apply with water. For plots with a slightly poorer degree of envelopment, the amount of topdressing should be appropriately increased.
3. Pest control: In this period, the main pests and diseases are downy mildew, black spot, soft rot, black rot, bacterial angular spot, aphids, cabbage caterpillar, beet armyworm and so on. Ask for symptomatic medication and scientific prevention. Spraying should be thoughtful and meticulous, and the front and back of the leaves should be sprayed. Scientific use of drugs according to the law of the occurrence of pests. The life rhythm of the night moth pests is nocturnal, and the prevention and treatment needs to be carried out in the morning and evening. Chemical control combined with physical control, conditional use of insecticidal lamps or yellow boards to trap and control pests. Specific medication:
(1) Disease control: downy mildew: spray with 72% ke WP 600 times solution or use 69% Anke Mn-Zn wettable powder 800-1000 times solution. Black spot: 50% phorhin WP can be used 1000 times. Soft rot, black rot: can use 72% agricultural streptomycin 4000 times solution, or 77% can kill WP 1500 times solution. It was found that the soft rot and black rot disease plants should be removed in time, and they should be taken out of the field for deep burial. The diseased points should be disinfected with quicklime or chemicals, and filled with soil to prevent the spread of germs after watering or rain. Bacterial angular plaque can be controlled by agricultural streptomycin 4000 times solution.
(2) Pest control: 5% pyrethrin emulsifiable concentrate 2000-2500 times can be used for controlling mites; 1.8% avermectin 3000 times liquid can be used for controlling beet armyworm; Cyclopene 1500 times solution can be used for controlling Plutella xylostella and cabbage caterpillar.
Huaxian County Shang Hongyan
Main points of management of fertilizer and water in Chinese cabbage
The cabbage period is the peak period of leaf weight growth, and the growth weight of the cabbage period accounts for about two-thirds of the whole growth period. Water and fertilizer management promotes pests and diseases.
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