Fertilization techniques for Chinese cabbage growing season

In the seedling stage, the seedling fertilizer is extracted from the cotyledon to the true leaf dew heart to 8~10 leaves, and about 15~20 days is the seedling stage. At this time, the growth rate is faster, which is the fastest period of differentiation between roots and leaf cells and tissues. Although there is not much fertilizer, the lack of time has a great impact on future yield. Therefore, after the seedlings are planted, 10 kg of ammonium nitrate should be applied.
After the rosette period, the key roots of the Chinese cabbage enter the rosette period, the roots occur in large quantities, the growth is prone to increase, and the amount of fertilizer is large. The leaves that produce nutrients during the ball-forming period grow substantially in this period. Therefore, the vigorous growth of the rosette period is on the leaf ball. Growth has a decisive role. This period is a crucial period for the future. The rosette period is generally 20~25 days, 15 kg of ammonium nitrate is applied, and a certain amount of phosphorus and potassium fertilizer is applied to promote the growth of the outer leaves, so as to lay a good foundation for the package.
The heart-filling period of the top-loading period accounts for 1/2 of the growth period, and the growth rate accounts for 2/3, which is the key period for the formation of Chinese cabbage. If the fertilizer is removed at this time, it will directly affect the tightness of the package, affecting the yield and quality. . The outer leaves of the heartbeat are close to the outer leaves of the heart, and it is also the fastest growing period of 1~5 heart leaves. At this time, 15 kg of ammonium nitrate is applied per mu; the outer leaves of the middle of the core are almost no longer growing, and the quick-acting fertilizer is applied. 10 kg of ammonium nitrate; late in the core, due to short light, low temperature, slow plant growth, less nutrient absorption, less obvious effect of topdressing, can be less chasing or not topdressing.

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