The water consumption of Chinese cabbage enters the core period is larger than that of the previous period. It must be irrigated and supplemented to maintain a uniform water supply, sufficient supply, and should not be used for a long time. The specific requirements are as follows: the first water in the core period should be small, and the water volume will cause damage to the plant; the first water in the core will enter normal irrigation after 4-5 days, generally 5-7 days, and the amount of irrigation water is not less than 30. Fang; stop watering one week before chopping vegetables, one is to avoid excessive moisture and is not resistant to storage, and the other is to facilitate harvesting and reduce losses caused by mechanical damage. In the core period, the topdressing should be based on the application of fertilizer with water. The first top dressing is applied before the cold dew, and the second time is the top dressing a few days before the frost. During this period, the temperature gradually decreased. The fertilizer should be applied mainly to quick-acting nitrogen fertilizer. Generally, ammonium sulfate was used. It is advisable to apply 20-30 kg per mu, and it should be applied with water. For plots with a slightly poorer degree of envelopment, the amount of topdressing should be appropriately increased. In the later period, stop topdressing, so as to avoid the growth of Chinese cabbage. Pest Control. The cabbage should be stopped for the first half of the harvest. The Chinese cabbage should focus on the control of downy mildew, black spot, soft rot, black rot, bacterial angular spot, aphids, cabbage caterpillar, beet armyworm and so on. Ask for symptomatic medication, scientific and timely prevention. Spraying should be thoughtful and meticulous, and the front and back of the leaves should be sprayed. 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: 72% frost urea-manganese-zinc wettable powder 600-800 times liquid; or 69% Anke manganese-zinc wettable powder 800-1000 times liquid; or 72% kelu Wet powder 600 times liquid spray control. Black spot: It can be treated with 50% phorhin WP 1000 times solution or 80% WP 1500-800 times solution. Soft rot, black rot: can use 72% agricultural streptomycin 4000 times solution, or 77% can kill WP 1500 times solution. It is 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 with 4000 times of neomycin. (2) Pest control: control of beet armyworm can use 1.8% avermectin 3000 times solution; control Plutella xylostella, cabbage caterpillar can use 2.5% vegetable hi-suspension agent 1000-1500 times liquid; Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Body Scrub,Coffee Body Scrub,Salt Scrub,Sugar Scrub For Body Guangzhou Lingxue Cosmetics Co., Ltd , https://www.gzlxgj188.com