Expert (Professor Wang Xingren from China Agricultural University): Chinese cabbage and cabbage are all cabbage leaves. Their common features are: 1. High yield; 2. Require NPK combined application, demand for nitrogen, potassium, calcium and boron Relatively high; 3. In addition to basal fat, rosette period and pre-packaged period is the key period for topdressing.
Question: In view of the characteristics of fertilizer requirements for these two types of vegetables, how can we rationally apply fertilizer?
Experts: Basal fertilizer: Mushi decomposed organic fertilizer 3-5, urea 9-11 kg, diammonium 15-20 kg or superphosphate 40-50 kg, potassium chloride or potassium sulfate 15-20 kg. Or application of compound fertilizer, 30-50 kg per mu. Topdressing: Mushi 7-10 kilograms of urea during the lotus root period, and 20-30 kilograms of urea per acre at the time of the core period, of which more than half are in the early period of the heart and one half is in the middle of the heart.
Question: If the land is relatively thin, can it be used to promote the growth of seedlings?
Expert: Of course you can. Application of 3-5 kg ​​urea or diammonium per acre in two ways: can be applied to sowing holes or ditch before live broadcasting, and fully mix with the soil, and then watering sowing; or after ditching Ding Shi to promote seedlings Grow.
Question: Mr. Lin from Beijing asked: The north is a calcareous soil, and there is no shortage of calcium. Why does Chinese cabbage often appear as a "dry heart?" How to prevent it?
Experts: Chinese cabbage requires a large amount of calcium, prone to dry heartburn. This is not because the soil lacks calcium, but because of soil drought or salt concentration is too high, inhibiting the absorption of calcium by Chinese cabbage. If organic fertilizer can be properly added to keep the soil moist, and spray 0.3%-0.5% calcium chloride or calcium nitrate solution every 7 days during the growth period of Chinese cabbage, continuous spraying 2-3 times, can be effective To control cabbage "dry heart".
Question: Does the Chinese cabbage fertilization technique apply to cabbage cabbage?
Experts: The Chinese cabbage fertilization program basically also applies to cabbage. The difference is that most cabbages are transplanted and transplanted. They are divided into spring cabbage, summer cabbage, and autumn cabbage because of different cultivation seasons. In the fertilization should pay attention to the cultivation of strong seedlings, due to the length of growth period appropriate to adjust the amount of fertilizer. In addition, cabbage is more prone to boron deficiency. It can apply about 1 kilogram of borax when applying base fertilizer or spray 0.2% borax solution at the beginning of the ball.
Question: Mr. Liu from Texas in Shandong asked: What is the difference between fertilization of cabbage seedlings and fertilization before transplanting?
Experts: The main difference is that they should be formulated with fertile and nutritious soils with good physical properties and soil disinfection. If it is early spring nursery, it also needs a certain amount of insulation and windproof equipment.
Question: Mr. Hou from Shijiazhuang, Hebei Province asked: Can Chinese cabbage be used for continuous cropping or radish rotation?
Experts: Chinese cabbage cannot be used as a continuous crop, and it cannot be rotated with cruciferous vegetables. Radish is cruciferous, so it cannot be rotated.
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