Cabbage growth period Qiaofei source:
Chinese cabbage has a large amount of growth and a short growing period. It is necessary to ensure the supply of nutrients during various growth periods in order to accelerate growth and increase production. According to practical experience, the Chinese cabbage needs different fertilizers at each growth stage, which accounted for 10% of the total absorption before the rosette period and 90% of the total absorption during the ball stage.
1, seedling period to raise seedlings. From the cotyledons to the true leaves and exposed to 8-10 leaves, about 15-20 days for the seedling period. At this time, the growth rate is faster, which is the fastest period of differentiation of root and leaf cells and tissues. Although there is not much need for fertilizer, the lack of time has a great influence on the future yield. Therefore, after Miao Ding should apply 10 kg ammonium nitrate.
2, rosette focus fertilizer. After the Chinese cabbage enters the rosette stage, a large number of roots occur, the growth is prone to increase sharply, and the amount of fertilizer is large. The leaves that make nutrients during the ball stage are basically grown at this stage. Therefore, the vigorous growth of the rosette stage plays a decisive role in the growth of the leaf ball. . This period is a critical period for future good or bad. Rosette period is generally 20-25 days, 15 kg per mu ammonium nitrate, and a certain amount of phosphorus, potash fertilizer, to promote the growth of outer leaves, in order to protect the good foundation.
3, the top dressing fertilizer. The balding 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 the Chinese cabbage core. If the fertilizer is removed at this time, it will directly affect the tightness of the pack and affect the yield and quality. The outer leaves close to the heart and leaves in the early period of the heart continue to grow, which is also the fastest growing period of 1-5 leaves. At this time, 15 kg of ammonium nitrate is applied in the Mushi. The outer leaves of the center of the core are almost no longer growing, and the mu is used for quick-impact fertilizer. Ammonium nitrate 10 kilograms; late in the package period, due to short light, low temperature, slow plant growth, low nutrient absorption, no obvious top dressing effect, and less or no top dressing.