Chinese cabbage is one of the main leafy vegetables in the north. Its main feature is the harvesting of leaves, the number of leaves is large, and the heart is formed into leaves. Reasonable management of Chinese cabbage can have a high yield, generally up to 5,000 kg per mu. Chinese cabbage has a long growth period and wants to obtain high yield. The water and fertilizer management in the whole growth period must master several key technologies:
Applying the base fertilizer is the basis for the harvest of Chinese cabbage. In the old vegetable fields, the soil fertility is high, and the organic fertilizer can be applied in a small amount. The proportion of nutrients in compound fertilizer is mainly nitrogen and potassium, and combined with phosphate fertilizer. On the new vegetable field, it is necessary to re-apply organic fertilizer and apply ternary compound fertilizer.
From the seedling stage to the grouping period, it is necessary to control the water and control fertilizer (mainly controlling nitrogen). In addition to special circumstances to apply seedlings, generally in the rosette period to seedlings, the purpose is to make the above-ground assimilated organs (outer leaves) grow robust, promote root growth and under-line, for the late rapid growth and a large number of absorption of nutrients and moisture basis.
The first time the topdressing should be carried out at the critical time of the rosette period. The top dressing is based on the quick-acting nitrogen fertilizer, and the potash fertilizer is applied in time, and the water fertilizer is added to the core period.
The 2-3th top dressing is carried out in the early and middle stages of the core. Mainly apply nitrogen fertilizer, up to two times, to control the dosage. After the core of the package, the nitrogen fertilizer was stopped. The amount of nitrogen fertilizer per top dressing should be determined by the growth of Chinese cabbage.
In the high-yield fertilization of Chinese cabbage, in addition to the large amount of nitrogen, phosphorus and potassium, the application of medium and trace elements should also be considered. From the current problems in the production of Chinese cabbage, some areas are mainly the physiological deficiency of calcium and boron. The solution is as follows: direct application of calcium nitrate by root dressing, or spraying of foliar fertilizer containing calcium, boron and iron. (New Rural Business Network)
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