When applying compound fertilizer in winter, it is necessary to pay attention to the following points: Nitrate and ammonium nitrogen in the compound fertilizer absorb some of the heat during the dissolution process, which may affect the ground temperature and adversely affect the growth of the crop root system. However, the normal growth of crops requires adequate supply of nutrients, so when applying compound fertilizers in the winter, it is necessary to use less and apply them sparingly, and try to flush them on sunny mornings. The second is to use pure biological fertilizers (without nitrogen, phosphorus and potassium). Pure biofertilizer contains a variety of beneficial bacteria, which can activate and improve the soil and act as nitrogen fixation, phosphate release and potassium release. These biological bacteria can also promote crop absorption of fertilizers. The third is to apply it in a targeted manner. Leafy vegetables grow fast, require more nitrogen and less phosphorus, and use high-nitrogen and low-phosphorus compound fertilizers; fruits and vegetables in the results of the demand for potassium more, less demand for phosphorus, can be used High potassium and low phosphorus compound fertilizer. For fields that are preparing to cultivate vegetable seedlings, because the crop needs a large amount of phosphorus at the seedling stage, a compound fertilizer with high phosphorus content can be used as a base fertilizer. After the vegetable seedlings are planted and cultivated slowly, the compound fertilizer with high phosphorus content may be flushed and applied.
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