The amount of total fertilizer in the bottom of the wheat can be enough, and the total amount of fertilizer in the bottom of the foot can be balanced. The amount of fertilizer is sufficient and the balanced wheat can grow well. According to the characteristics of poor water solubility and mobility of phosphate fertilizers in the soil, phosphorus fertilizer should be used as a deep basal fertilizer. Potassium fertilizer is fully dissolved in water after being applied to the soil, and part of it is absorbed by plants. Most of them are temporarily stored by soil adsorption, and are later absorbed by plants. Therefore, potassium is generally emphasized as base fertilizer. At the same time, phosphorus and potassium fertilizers before winter as top-dressing, far less as a base fertilizer, spring fertilizer effect is much worse. This way, the P and K fertilizers in wheat fertilization should generally be applied at the end of the year. The use of organic fertilizer is more effective. The absorption of nitrogen, phosphorus, and potassium in wheat seedlings is less than half of the total absorption, but this period is also a sensitive period for fertilizers. If it is lacking, it will cause serious consequences. Therefore, nitrogen fertilizers must be applied enough to meet the requirements of top dressing. The former needs, so that the application of the remaining nitrogen fertilizer in the spring topdressing will ensure that the total amount is sufficient and the nutrient balance. If the phosphorus and potassium in the base fertilizer are insufficient, it is difficult to ensure the effect of topdressing. Only topdressing of nitrogen fertilizer will cause many problems such as severe shortage of phosphorus and potassium, unbalanced nitrogen, phosphorus and potassium, and insufficient total amount of fertilizer. Not only does high yield also cause the waste of nitrogen fertilizer. If the nitrogen fertilizer in the base fertilizer is insufficient, it is obviously better to adopt the method of seed dressing. It is obviously not as good as direct application.
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