Soil fertilization in facility cultivation is different from open field conditions, and three points should be noted when soil fertilization:
First of all, the role and purpose of fertilization have changed significantly. Soil fertilization under open field conditions is the main goal to meet the needs of crops for various fertilizer elements, and soil fertilization in facility cultivation is not only the above objectives, but also The task of supplying carbon dioxide, the main raw material for crop photosynthesis. Because the carbon dioxide in the air in the facility is difficult to be replenished from the air circulation, whether the carbon dioxide is sufficient or not is the primary factor restricting the yield of crops in the facility. Whether the fertilizer element is sufficient and the proportion is reasonable, although it is still an important factor restricting crop yield, it is not the most important compared with the carbon dioxide content in the facility. Therefore, soil fertilization in facility cultivation not only needs to meet the demand of various fertilizer elements in crops, but more importantly, it meets the demand for carbon dioxide in crop photosynthesis.
Second, as the fertilization target changes, the type of fertilizer applied will inevitably change. Under the open field conditions, the organic fertilizer is obviously inferior to the various quick-acting fertilizers. In the cultivation of facilities, no matter which kind of quick-acting fertilizer, it can not meet the demand of carbon dioxide in crops. After organic fertilizer is applied into the soil, it is decomposed by soil microorganisms, but the energy source continuously releases carbon dioxide. Therefore, organic fertilizer is the first choice and must be used for fertilizer cultivation. Whether it is base fertilizer or top dressing, organic fertilizer should be applied to meet the demand of carbon dioxide. A variety of quick-acting fertilizers, especially available nitrogen fertilizers, can only be properly compounded with organic fertilizers, and the application rate must be strictly controlled, and should not be applied too much to avoid soil salinization and ammonia damage.
Third, the application method is different. After the crop is planted, whether it is to apply organic fertilizer or apply fertilizer, it must be carried out on a sunny morning, so that spreading, digging, watering and laminating are carried out simultaneously. It is strictly forbidden to carry out top dressing operations in cloudy and afternoon. At the same time, the vents must be opened at the same time. Otherwise, the ammonia and water vapor volatilized during the topdressing operation cannot be eliminated in time, which will seriously harm the crops. If the indoor humidity is too high, the disease may be induced. In pursuit of quick-acting fertilizer, it must be dissolved into an aqueous solution in advance, and applied with water to prevent nitrogen from being absorbed by the soil solution in time and volatilizing ammonia gas.
First of all, the role and purpose of fertilization have changed significantly. Soil fertilization under open field conditions is the main goal to meet the needs of crops for various fertilizer elements, and soil fertilization in facility cultivation is not only the above objectives, but also The task of supplying carbon dioxide, the main raw material for crop photosynthesis. Because the carbon dioxide in the air in the facility is difficult to be replenished from the air circulation, whether the carbon dioxide is sufficient or not is the primary factor restricting the yield of crops in the facility. Whether the fertilizer element is sufficient and the proportion is reasonable, although it is still an important factor restricting crop yield, it is not the most important compared with the carbon dioxide content in the facility. Therefore, soil fertilization in facility cultivation not only needs to meet the demand of various fertilizer elements in crops, but more importantly, it meets the demand for carbon dioxide in crop photosynthesis.
Second, as the fertilization target changes, the type of fertilizer applied will inevitably change. Under the open field conditions, the organic fertilizer is obviously inferior to the various quick-acting fertilizers. In the cultivation of facilities, no matter which kind of quick-acting fertilizer, it can not meet the demand of carbon dioxide in crops. After organic fertilizer is applied into the soil, it is decomposed by soil microorganisms, but the energy source continuously releases carbon dioxide. Therefore, organic fertilizer is the first choice and must be used for fertilizer cultivation. Whether it is base fertilizer or top dressing, organic fertilizer should be applied to meet the demand of carbon dioxide. A variety of quick-acting fertilizers, especially available nitrogen fertilizers, can only be properly compounded with organic fertilizers, and the application rate must be strictly controlled, and should not be applied too much to avoid soil salinization and ammonia damage.
Third, the application method is different. After the crop is planted, whether it is to apply organic fertilizer or apply fertilizer, it must be carried out on a sunny morning, so that spreading, digging, watering and laminating are carried out simultaneously. It is strictly forbidden to carry out top dressing operations in cloudy and afternoon. At the same time, the vents must be opened at the same time. Otherwise, the ammonia and water vapor volatilized during the topdressing operation cannot be eliminated in time, which will seriously harm the crops. If the indoor humidity is too high, the disease may be induced. In pursuit of quick-acting fertilizer, it must be dissolved into an aqueous solution in advance, and applied with water to prevent nitrogen from being absorbed by the soil solution in time and volatilizing ammonia gas.
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