Pick up the seedlings: from the cotyledons to the true leaves to 8-10 leaves, about 15-20 days for the seedling stage. It is the fastest period of root and leaf cell and tissue differentiation, and it grows fast. Although it does not require much fertilizer, it lacks a great influence on future yield. Therefore, after the seedlings are planted, 7-10 kg of nitrogen fertilizer should be applied.
During the rosette period, the main topdressing: After the Chinese cabbage enters the rosette stage, the roots occur in a large amount, the growth is sharply increased, 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 period is on the leaf ball. Growth has a decisive role. This period is a crucial period of good fortune. The rosette period is generally 20-25 days, 10 kg of nitrogen fertilizer is applied per mu, 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.
Top-loading topdressing: The long-term growth period of the core period and the large amount of growth are 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 pre-package period is the fastest period of 1--5 leaf growth. At this time, 10 kg of nitrogen fertilizer is applied to the mu; the mid-outer leaves of the core are almost no longer growing, and the quick-acting nitrogen fertilizer is applied for 10 kg; Short, low temperature, slow plant growth, less nutrient absorption, less obvious effect of topdressing, less chasing or no topdressing.
Huaxian County
During the rosette period, the main topdressing: After the Chinese cabbage enters the rosette stage, the roots occur in a large amount, the growth is sharply increased, 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 period is on the leaf ball. Growth has a decisive role. This period is a crucial period of good fortune. The rosette period is generally 20-25 days, 10 kg of nitrogen fertilizer is applied per mu, 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.
Top-loading topdressing: The long-term growth period of the core period and the large amount of growth are 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 pre-package period is the fastest period of 1--5 leaf growth. At this time, 10 kg of nitrogen fertilizer is applied to the mu; the mid-outer leaves of the core are almost no longer growing, and the quick-acting nitrogen fertilizer is applied for 10 kg; Short, low temperature, slow plant growth, less nutrient absorption, less obvious effect of topdressing, less chasing or no topdressing.
Huaxian County
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