1. Pick up seedlings at the seedling stage. From cotyledon development to true leaf dew to 8-10 leaves, about 15-20 days for seedling stage. At this time, the growth rate is faster, which is the fastest period of differentiation of roots and leaf cells and tissues. Although there is not much fertilizer required, the lack of time has a great influence on the yield. Therefore, after the seedlings are planted, 10 kg of ammonium nitrate should be applied.
2. Focus on topdressing during the rosette period. After the Chinese cabbage enters the rosette stage, the roots occur in large quantities, the growth is prone to increase, the amount of fertilizer is large, and the leaves that produce nutrients during the ball-forming period grow substantially in this period. Therefore, the vigorous growth of the rosette stage plays a decisive role in the growth of the leaf ball. . This period is a crucial period for the future. The rosette period is generally 20-25 days, 15 kg of ammonium nitrate is applied in acre, 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 keeping the heart.
3, the core period of topdressing. The core 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 and affect the yield and quality. The outer leaves close to the heart leaf in the early stage of the circumstance continue to grow, and it is also the fastest period of 1-5 heart leaf growth. At this time, 15 kg of ammonium nitrate is applied per mu; the outer leaves of the middle part of the core are almost no longer growing, and the quick-acting fertilizer is chased. 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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