First, due to irritating fertility. Such as wheat and potato pods, because of the early harvest, there is ample time for leisure sunburn, should be applied more water containing pig manure, cow dung and other cold fertilizers. Cold and cold. Such as cabbage, rape and other mouthwash, due to harvest late, it is appropriate to use sheep manure, horse dung and other hot fertilizer. Soft ticks. Such as soybeans and other mouthwash, the soil more moist and soft, leaving more nitrogen, should apply more phosphorus, potassium fertilizer. Hard 茬. Such as corn, sorghum and other mouthwash, the soil is tight, should be applied to contain more organic fertilizer. Second, due to crop fertilization due to rhizobia of legumes, it can fix nitrogen in the air by nitrogen fixation, so less nitrogen is needed, and more phosphorus is needed. Therefore, consider applying less nitrogen fertilizer when fertilizing. Gramineous crops need more phosphorus and potassium in addition to more nitrogen. When fertilizing, we should pay attention to the reasonable combination of nitrogen, phosphorus and potassium. Leafy crops require more nitrogen, and fertilization should be dominated by nitrogen fertilizers. Third, due to soil fertilization different types of soil fertility, fertilizer supply capacity varies greatly. The texture is heavy and the ground temperature is low. Pay attention to fertilization at the seedling stage. Sandy soil, due to poor fertility, the amount of fertilizer should not be too large, it should be divided up. 4. Weather conditions affecting the growth of crop roots and absorption of nutrients due to fertilization weather conditions also affect the state of nutrients in the soil. Therefore, fertilization in the cold season should be appropriately advanced as needed. High-temperature fertilization should prevent fertilizer effects from being exerted, and fertilization in the rain should prevent the loss of fertilizers. Fifth, due to the nature of fertilizer Fertilizer generally chemically unstable and volatile fertilizers, such as ammonium sulfate, ammonium nitrate, ammonium bicarbonate, etc. should pay attention to the application of deep cover soil, reduce nutrient loss. For the smaller-moving phosphate fertilizer, it should be used as base fertilizer and seed fertilizer and applied to the root concentrate layer. Fertilizers that are soluble in water are suitable for topdressing. In paddy fields, nitrate nitrogen fertilizers should not be applied and ammonium nitrogen fertilizers should be applied.
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