Cabbage has a large growth and short growth period. It is necessary to ensure the supply of nutrients in each growth period 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 the data, about 5,000 kilograms of Chinese cabbage per mu absorbs about 13.5 kilograms of nitrogen, 4 kilograms of phosphorus, and 10 kilograms 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 seedlings": from the cotyledons to the true leaves of the heart to 8-10 leaves, about 15-20 days for the seedling stage. The growth rate of seedlings is faster, about twice as much as daily. In this period, sufficient nutrients are required, and the fertilizer accounts for 2.4% of the total growth period. Time is the fastest period of root and leaf cell and tissue differentiation, and the 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 quantities, 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 vigorous growth of the rosette period plays a decisive role in the growth of the leaf ball. The amount of nutrient supply in this period is directly related to the high yield. This is a crucial period for the future. The rosette period is generally 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, promote 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 quality. As the outer leaves of the heart leaf close to the heart of the pre-envelope continue to grow, it is also the fastest period of 1-5 leaf growth. As the outer leaves are covered with the ground, the surface produces a large amount of water roots, which makes the root system absorb nutrient capacity to a peak. In terms of time, it has entered the season of high autumn, sunny days, light enough, 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, to accelerate the speed of the core. In the late stage of the package, due to the short illumination, low temperature, slow growth of the plant, less nutrient absorption, and the effect of topdressing is not obvious, it can be chased less.
First, the seedling period chasing "lifting seedlings": from the cotyledons to the true leaves of the heart to 8-10 leaves, about 15-20 days for the seedling stage. The growth rate of seedlings is faster, about twice as much as daily. In this period, sufficient nutrients are required, and the fertilizer accounts for 2.4% of the total growth period. Time is the fastest period of root and leaf cell and tissue differentiation, and the 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 quantities, 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 vigorous growth of the rosette period plays a decisive role in the growth of the leaf ball. The amount of nutrient supply in this period is directly related to the high yield. This is a crucial period for the future. The rosette period is generally 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, promote 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 quality. As the outer leaves of the heart leaf close to the heart of the pre-envelope continue to grow, it is also the fastest period of 1-5 leaf growth. As the outer leaves are covered with the ground, the surface produces a large amount of water roots, which makes the root system absorb nutrient capacity to a peak. In terms of time, it has entered the season of high autumn, sunny days, light enough, 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, to accelerate the speed of the core. In the late stage of the package, due to the short illumination, low temperature, slow growth of the plant, less nutrient absorption, and the effect of topdressing is not obvious, it can be chased less.
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