1. Deep application of nitrogen fertilizer. The deep application depth can be flexibly controlled. When the amount of chemical fertilizer is small (5-10 kg/mu), it can be applied to the soil layer 10 cm deep; when the fertilizer is used for a long time (20-25 kg/mu), it is applied 15 cm deep.
2. Fertilize the soil. Generally, the calcareous soil has a high pH value and is alkaline. It is preferable to use acidic or physiological acid fertilizers such as ammonium sulfate and ammonium chloride, and acidic soil should use physiological alkaline calcium fertilizer.
3. Fertilize the crop. Generally, cereal crops and leaf crops such as vegetables and teas require more nitrogen, which is preferred. For legume crops, legume green manure, etc., there is only a small amount of nitrogen fertilizer applied in the early stage of growth.
4. Fertilization due to climate. Under normal climatic conditions, crops have strong metabolic capacity, and more nutrients are absorbed and utilized. More nitrogen fertilizer can be applied, and vice versa.
5. Cooperate with other fertilizers. Consider the rational application of NPK and other nutrient fertilizers. The application of organic fertilizer as the base fertilizer and the application of nitrogen fertilizer as top dressing can increase the yield of various crops.
(Source: Sichuan Science and Technology News)
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