The growth of Chinese cabbage is large and the growth period is short. It is necessary to ensure the supply of nutrients in various growth stages, and the ability to accelerate growth and increase production. Cabbage absorbs large amounts of nitrogen, phosphorus, potassium and some trace elements during the growth process. According to the material record: about 5,000 kg of Chinese cabbage per mu absorbs about 13.5 kg of nitrogen, 4 kg of phosphorus and 10 kg of potassium. The amount of fertilizer required for each growth period is also different. The rosette period accounts for 10% of the total absorption, and the ball-forming period accounts for 90% of the total absorption. to this end:
First, the seedling period chasing "lifting seedling fertilizer": from the cotyledon to the true leaf dew to 8-10 leaves, about 15-20 days for the seedling stage. The growth rate of seedlings is relatively fast, about twice as much as that of each day. In this period, there is sufficient nutrients, and the fertilizer accounts for 2.4% of the total growth period. Time is the fastest period of differentiation between roots and leaf cells and tissues, and lack of fertilizer has a great impact on future yield. Therefore, after fixing the seedlings, 10 kg of ammonium nitrate should be traced to ensure good development at the seedling stage.
Second, the rosette period should focus on topdressing: After the cabbage enters the rosette period, the root system occurs in large numbers, the growth amount increases sharply, and the amount of fertilizer is large. The leaves that produce nutrients during the balling period grow substantially in this period, so the lush growth of the rosette stage plays a decisive role in the growth of the leaf ball. The amount of nutrient supply in this period is directly related to the harvest. This is a crucial period for the future. The rosette period is usually 20-25 days. The amount of fertilizer absorbed accounted for 41.8% of the total growth period. Acre of ammonium nitrate 15 kg, and with a certain amount of phosphorus, potassium fertilizer, increase the growth of the outer leaves, improve photosynthesis, and lay a good foundation for the package.
Third, the top-of-the-line 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 the Chinese cabbage. The root development reaches the maximum, which is the product organ formation period. Long, the fertilizer accounted for 55.8% of the total growth period. If this period of de-fertilization, it directly affects the cohesive growth of the heart, reduces the tightness of the core, and affects the yield and character. Because the outer leaves of the heart of the heart are close to the growth of the outer leaves, it is also the fastest period of 1-5 heart growth. Because the outer leaves are covered with the ground, a large number of water roots are produced on the surface, so that the root system absorbs the nutrient capacity to the peak. In terms of time, it has entered the season of high autumn, sunny, light, day and night temperature difference and humidity, which is a good climatic condition for cabbage growth. Mu chasing 15 kg of ammonium nitrate. The mid-outer lobe of the core is almost no longer long, 1-5 leaves grow, and 6-10 leaves grow vigorously. Mu chasing quick-acting fertilizer, 10 kg of ammonium nitrate, speeding up the speed of the core. In the late stage of the package, because the light is short, the temperature is low, the plant growth is slow, the nutrient absorption is less, the effect of topdressing is not obvious, and it is possible to chase less.
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