Chinese cabbage requires higher soil moisture during the emergence period. When the soil is dry, the seeds are not easy to germinate, and even if they are germinated, it is easy to appear "bud dry" dead seedlings. Therefore, the sowing requires that the soil moisture is better, spray water after the sowing, keep the kneading surface moist, and ensure the emergence of seedlings.
The seedling stage is in the high temperature and dry season. In order to cool down and prevent disease, it is necessary to water the soil frequently, keep the soil moist, prevent the soil from cracking, tear the root system, infect soft rot and virus disease, and generally require watering once every 3~4 days to achieve “ Sanshui Qi Miao, Wushui Dingshu."
Chinese cabbage is generally "sowed" for 4 to 6 days after the seedling water is used, so as to promote the development of the root system deep underground, enhance the drought resistance, and make the above-ground leaves grow robust and enhance disease resistance. After the "small seedlings", the large amount of water is poured in combination with the top dressing, and then the water is generally watered once every 6 to 7 days to keep the soil moist. The rosette period of Chinese cabbage is the period of rapid formation and development of the outer leaves. It is the key period for the robust development of Chinese cabbage, and it is an important period for fertilizer. It is necessary to attach great importance to this “fertilizerâ€. After the seedling water is set, when the soil moisture is suitable, in the middle of the ridge, open the shallow ditch 8~10 cm deep from the plant 18~20 cm, and sprinkle the pre-fertilized and finely-cut high-quality organic fertilizer into the ditch, 1200~ per mu. 1500 kg or plump organic fertilizer 500 kg, if the organic fertilizer is not enough or the quality is not high, you can also add 15 kg of quick-acting fertilizer such as ammonium carbonate or ammonium sulfate, then buried the soil and seal the ditch. It can also be applied to 1500~2000 kg of decomposed human excrement. Or use 200kg to 500 times of roots per acre to dilute 200~500 times or apply with watering, which can promote the core, increase the weight of the white menu and reduce the occurrence of diseases.
Chinese cabbage enters the ball-forming period, and the aboveground and underground parts are in a period of vigorous growth, and the demand for fertilizer and water reaches a peak. In this period, it is necessary to re-fertilize. Each acre can be applied with 25-30 kg of ammonium carbonate or ammonium sulfate or 2500 kg of human excrement. It is generally applied to the field with water. Be sure to pay attention to uniformity when applying fertilizer. In the autumn, there are often rain or heavy rain, so pay attention to doing drainage work.
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