Expert (Wang Xingren, Professor of China Agricultural University): Chinese cabbage and cabbage are all cabbage leaves. Their common characteristics are: 1. High yield; 2. Requires application of nitrogen, phosphorus and potassium, demand for nitrogen, potassium, calcium and boron. Relatively high; 3. In addition to the base fertilizer, the rosette period and the pre-package period are the key periods for topdressing.
Question: How to fertilize the fertilizers of these two kinds of vegetables?
Expert: Base fertilizer: 3-5 square meters of organic fertilizer, 9-11 kg of urea, 15-20 kg of diammonium or 40-50 kg of superphosphate, 15-20 kg of potassium chloride or potassium sulfate. Or apply compound fertilizer, 30-50 kg per mu. Top dressing: 7-10 kg of urea is applied in the rose period, and 20-30 kg of urea is applied in the period of the core period. More than half of them are in the early stage of the package, and half of them are in the middle of the package.
Question: If the ground is thinner, can it be used to promote the growth of seedlings?
Expert: Of course. Apply 3-5 kg ​​of urea or diammonium per mu. There are two methods: it can be applied to the seeding hole or ditch before the live broadcast, and mixed with the soil, and then watered for sowing; or after the seedling is applied to promote the seedling Growing.
Question: Mr. Lin of Beijing asked that the north is a calcareous soil and there is no shortage of calcium. Why do Chinese cabbages often have “dry heart� How to prevent it?
Expert: Chinese cabbage requires a large amount of calcium, which is prone to dry heartburn. This is not because the soil is deficient in calcium, but because of soil drought or high salt concentration, it inhibits the absorption of calcium by Chinese cabbage. If the organic fertilizer can be properly applied, keep the soil moist, and spray 0.3%-0.5% calcium chloride or calcium nitrate solution every 7 days or so in the growth period of Chinese cabbage, and continuously spray 2-3 times, it can be effective. Control the Chinese cabbage "dry heart".
Question: Is the fertilization technique of Chinese cabbage suitable for cabbage?
Expert: The fertilization scheme of Chinese cabbage basically applies to cabbage. The difference is that cabbage is mostly transplanted and transplanted, and it is divided into spring cabbage, summer cabbage and autumn cabbage due to different cultivation seasons. In fertilization, attention should be paid to cultivating strong seedlings, and the amount of fertilization should be properly adjusted due to the length of the growth period. In addition, cabbage is more susceptible to boron deficiency, and about 1 kg of borax can be applied to the base fertilizer or 0.2% borax solution can be sprayed at the beginning of the ball.
Question: Mr. Liu from Dezhou, Shandong asked, what is the difference between fertilization of seedlings in cabbage and fertilization before transplanting?
Experts: The main difference is that the fertile soil with good physical properties should be prepared for the seedbed and the soil should be disinfected. If it is early spring nursery, you need a certain insulation and windproof equipment.
Question: Mr. Hou from Shijiazhuang, Hebei Province asked, can Chinese cabbage be made or rotated with radish?
Expert: Chinese cabbage can't be used continuously, nor can it be rotated with cruciferous vegetables. The radish is cruciferous, so it can't be rotated.
Source: People's Daily
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