Greenhouse vegetables should be less base fertilizer
2020-10-21 13:17:24
First of all, greenhouses are closed facilities, indoor harmful gases can not be ruled out, such as the use of base fertilizer is too much, volatile ammonia, indoor vegetables to suffer from ammonia hazards, so that the leaves dry spots or spots, severe leaves withered until Dead tree phenomenon occurs.
Second, before the vegetables enter the fruiting period, the amount of fertilizers is only about 1/6 of the total amount of fertilizers in the whole growth period. In this period, the soil and fertilizer should not be too much, which will not only cause burning phenomenon but also cause seedlings to sprout. Prosperous, affect flower bud differentiation, delay the result period.
Third, due to the large amount of long-term fertilization in greenhouse vegetables, various nutrient elements in the soil are not lacking, and carbon dioxide is lacking. However, the demand for carbon dioxide in crops during the seedling period is very small, and it gradually increases with the increase in the number of leaves. When the results reach a peak, the demand for carbon dioxide reaches a peak. The carbon dioxide in the greenhouse mainly comes from the decomposition of organic fertilizer in the soil. After the organic fertilizer is applied to the soil, the release period of carbon dioxide is about 10 to 50 days after fertilization. A large amount of basal fertilizer will not only cause burning phenomenon, but also the amount of carbon dioxide emitted will be wasted due to the small amount of pre-reproductive crops. After entering the result period, the amount of carbon dioxide required has increased. During this period, the period of carbon dioxide release in the soil has passed, and the supply of carbon dioxide has been insufficient, which has restricted the exertion of photosynthetic efficiency and has affected the increase of production.
Second, before the vegetables enter the fruiting period, the amount of fertilizers is only about 1/6 of the total amount of fertilizers in the whole growth period. In this period, the soil and fertilizer should not be too much, which will not only cause burning phenomenon but also cause seedlings to sprout. Prosperous, affect flower bud differentiation, delay the result period.
Third, due to the large amount of long-term fertilization in greenhouse vegetables, various nutrient elements in the soil are not lacking, and carbon dioxide is lacking. However, the demand for carbon dioxide in crops during the seedling period is very small, and it gradually increases with the increase in the number of leaves. When the results reach a peak, the demand for carbon dioxide reaches a peak. The carbon dioxide in the greenhouse mainly comes from the decomposition of organic fertilizer in the soil. After the organic fertilizer is applied to the soil, the release period of carbon dioxide is about 10 to 50 days after fertilization. A large amount of basal fertilizer will not only cause burning phenomenon, but also the amount of carbon dioxide emitted will be wasted due to the small amount of pre-reproductive crops. After entering the result period, the amount of carbon dioxide required has increased. During this period, the period of carbon dioxide release in the soil has passed, and the supply of carbon dioxide has been insufficient, which has restricted the exertion of photosynthetic efficiency and has affected the increase of production.
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