In the agricultural production process, the majority of people apply compound fertilizers through a combination of basic and flushing methods. Now vegetables in some greenhouses are gradually entering the fruiting period, especially for melons and solanaceous vegetables, for nitrogen and phosphorus. The demand for potassium is large. Therefore, compound fertilizers with different contents need to be applied to meet their continuous growth needs. To use compound fertilizer in winter, please pay attention to the following points: One is to use less frequently. The nitrate nitrogen 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 roots. However, the normal growth of the crop still requires a sufficient supply of nutrients, so it is rushed in the winter. When applying compound fertilizer, it is imperative to use less ground facilities and try to flush out in the fine weather. The second is the application of pure biological fertilizers (without nitrogen, phosphorus, and potassium), such as fat field bio-fertilizers. Pure biological fertilizers contain a variety of beneficial bacteria, which can activate and improve the soil and play a role in nitrogen fixation, phosphate release, and potassium release. These biological bacteria can promote the full utilization of fertilizers in crops. The third is to apply it in a targeted manner. As leafy vegetables, because of their fast growth, high nitrogen and low phosphorus are needed, compound fertilizers with high nitrogen content and low phosphorus content should be used. However, the demand for potassium in fruits and vegetables is higher than that of fruits and vegetables. In many cases, the demand for phosphorus is reduced, and compound fertilizers with high potassium and low phosphorus can be selected. For those who are currently preparing to plant seedlings for sorghum, the demand for phosphorus at the seedling stage is large, and a compound fertilizer with a little higher phosphorus content can be used. As the base fertilizer, and appropriate amount of fertilizer containing some of the higher phosphorus compound fertilizer after planting easing seedlings.
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