During the seedling stage, the seedlings were raised from the cotyledon to the true leaf lobe to 8-10 leaves, and about 15-20 days were the seedling stage. At this time, the growth rate is faster, which is also the fastest period of differentiation of root and leaf cells and tissues. Although there is not much need for fertilizer, the lack of time will have a great impact on future yield. Therefore, after Miao Ding should apply 10 kg ammonium nitrate.
During the rosette period, after the top-dressing Chinese Cabbage enters the rosette stage, a large number of roots occur, the growth is easy to increase sharply, and the amount of fertilizer is large. During the ball-making period, the leaves that make nutrients are basically grown up. Therefore, the vigorous growth of the rosette period is opposite to that of the leaf ball. Growth has a decisive role. This period is a crucial period for future good or bad. Rosette period is generally 20-25 days, Mushi ammonium nitrate 15 kg, and with a certain amount of phosphorus, potash fertilizer to promote the growth of the outer leaves, in order to pack a good foundation.
The core period of top dressing during the core period accounts for 1/2 of the growth period, and the amount of growth accounts for 2/3. It is a critical period for the formation of cabbage cores. If the fat is removed at this time, it directly affects the tightness of the core and affects the yield and quality. . The outer leaves near the heart and leaves in the early period of the heart continue to grow, and it is also the fastest growing period of 1 to 5 leaves. At this time, 15 kg of ammonium nitrate is applied in the Mushi; the outer leaves of the middle of the core are almost no longer growing, and the fast-acting fertilizer can be used in the middle of the mu. Ammonium nitrate 10 kilograms; late in the package period, due to short illumination, low temperature, slow plant growth, low nutrient absorption, no obvious top dressing effect, and little or no top dressing. Http://Content/45958ef7-9a24-400a-a8a5-7a83a04637bb?cType=2
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