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How to fertilize cabbage
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. Cabbage absorbs a large amount of nitrogen, phosphorus, potassium and some trace elements during the growth process. According to historical records, about 5000 kg of Chinese cabbage per acre will absorb about 13.5 kg of nitrogen, 4 kg of phosphorus, and 10 kg of potassium. The amount of fertilizer required during each growth period is also different. Rosettes accounted for 10% of the total absorption before, and ball-gating period accounted for 90% of the total absorption. To this end: First, the seedling period to recover "seemling fertilizer": from the cotyledons to the true leaf exposed to 8-10 leaves, about 15-20 days for the seedling period. The seedling stage grows faster and grows more than twice a day. This period requires sufficient nutrients. The absorption of fertilizer accounts for 2.4% of the total growth period. At the time when the root and leaf cells and tissues have the fastest differentiation, the lack of fertilizer has a great influence on the future yield. Therefore, 10 kg of ammonium nitrate should be traced after the seedlings are seeded to ensure good growth during the seedling period. Second, the rosette period should focus on fertilizer: After the Chinese cabbage enters the rosette period, a large number of roots occur, the amount of growth increases, and the amount of fertilizer is large. The leaves that produce nutrients during the ball stage are basically grown at this stage. Therefore, the vigorous growth during the rosette period has a decisive effect on the growth of the leaf ball. The supply of nutrients in this period is directly related to the high yield. This is a crucial period for the future of good or bad. The rosette period is generally 20-25 days. The absorption of fertilizer accounted for 41.8% of the total growth period. Acres with ammonium nitrate 15 kilograms, and to apply a certain amount of phosphorus, potash fertilizer, promote outer leaf growth, improve photosynthesis, to lay a good foundation for good package. Third, the core period of dressing: Bao Xin period accounted for 1/2 of the growth period, growth accounted for 2/3, is the key period for the formation of Chinese cabbage core, root development to reach the maximum, is the product organ formation period, Meng Ye Meng Long, absorption of fertilizer accounted for 55.8% of the total growth period. If this period of defertilization, directly affect the cohesion of the heart and leaves, reduce the tightness of the heart, affect the yield and quality. As the outer leaves near the heart and leaves continue to grow in the early period of the heart, it is also the fastest growing period for 1-5 leafs. As the outer leaves are covered with ground, a large amount of water is generated on the surface of the ground, which allows the root system to absorb nutrients to a peak. In terms of time, it has entered the autumn season, with plenty of sunny weather, sufficient lighting, and a large temperature difference between day and night. It is a good climatic condition for the growth of Chinese cabbage. Mu chase 15 kilograms of ammonium nitrate. The outer leaves of the middle of the package are almost no longer, 1-5 pieces of heart and leaves grow, and 6-10 pieces of heart and leaves grow vigorously. Mu chase fast-acting fertilizer, ammonium nitrate 10 kg, to accelerate the speed of the heart. In the late period of the bag, due to short light, low temperature, slow growth of plants, low absorption of nutrients, and no obvious effect of top dressing, it can be pursued less or not.