Separate fertilization should not be too large for each fertilizer. If the amount of one-time fertilization is too large during drought, the fertilized fertilizer will be washed away when it encounters heavy rain after drought. This will not only cause economic losses to farmers but also pollute the environment. Therefore, it should be combined with fertilization by sub-fertilization.
Fertilizer deep application, with hydraulic fertilizer under drought conditions, spread the fertilizer on the ground, the fertilizer is volatile. If the drought is followed by heavy rain, it is also easy to be washed away by rain. Therefore, chemical fertilizers should be applied as far as possible.
Pay attention to the reasonable mix of fertilizers, especially potassium fertilizer and boron fertilizer. Because potassium ions can regulate the colloidal properties of the protoplasm, allowing the water to smoothly enter the cells and enhance the water holding capacity of the cells, therefore, the appropriate potassium nutrition can enhance crop water absorption capacity, enhance crop drought resistance, and increase soil water use efficiency. In addition, drought easily induces boron deficiency in crops, especially growing peanuts, fruit trees, and rapeseeds. Therefore, under drought conditions, it should pay attention to the appropriate application of potassium fertilizer and boron fertilizer.
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