Drought is bad for fertilizer efficiency Regarding the scientific basis for fertilization, there are arguments for “seeing the sky, seeing the land, and looking at the crops†in the land reclamation. The "seeing the sky" here means that when fertilizing, the impact of climate on fertilizer efficiency must be considered. The climatic conditions associated with plant growth include precipitation, temperature, and light, and they have a significant effect on crop growth and the efficiency of the absorption and utilization of nutrient elements and the conversion efficiency of different nutrient elements. Water is one of the necessary living conditions for crops. It can regulate the water, fertilizer, gas, and heat conditions of the soil, affect the effectiveness of fertilizer nutrients and the ability of crops to absorb nutrients from the soil. Drought has negative effects on the growth and development of crops and the process of crop absorption and utilization of nutrients, which makes fertilization less than ideal. Therefore, under drought conditions, it is necessary to appropriately reduce the total amount of fertilizer and use it as a base fertilizer at one time. Rational fertilization can be "fertilizer transfer" Drought is one of the main adverse factors restricting crop production in China. When drought is encountered in production, it can be combined with adequate irrigation to regulate crop growth and development. The relevant research results show that the effect of appropriate fertilization on the growth and development of crops under drought conditions is mainly reflected in the following aspects: (1) Increasing soil water use efficiency. Appropriate application of nitrogenous fertilizer under drought conditions can increase the effectiveness of soil moisture, that is, “diverting water with fertilizersâ€, making part of the original water that has no effect on plant growth become effective, so that the plants can absorb more soil moisture, to a certain degree Drought damage to crops. 2 Promote crop growth. Appropriate amount of nitrogen fertilizer under drought conditions can promote the growth of crops, and effectively compensate for the adverse effects such as reduced leaf area and slow spreading of the leaves under drought conditions, and promote the accumulation of dry matter. 3 improve the plant's physiological function. When the crop is subjected to drought stress, the plants need to mobilize the entire defense system against water deficit damage. Appropriate application of potash fertilizer can effectively reduce the degree of water damage on the plant cell membrane, thus significantly improve the drought resistance of the plant. It can be seen that when the plants are subjected to drought stress, the physiological functions of the plants can be regulated by proper fertilization, and indeed, they can relieve the adverse effects of drought. Fertilization principle under drought conditions (1) The amount of fertilizer applied once should not be too large. If a large amount of one-time fertilization occurs during a drought, it is easy to wash off the fertiliser when it encounters heavy rain after a 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. (2) Deep application of fertilizers with hydraulic fertilizer. In the case of drought, the fertilizer is volatile if only the fertilizer is applied to the surface. 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 deep as possible. (3) Pay attention to reasonable mix of fertilizers, especially potassium fertilizer and boron fertilizer. Many research data show that potassium ions can regulate the colloidal properties of the protoplasm, allowing water to enter the cells smoothly and enhance the water holding capacity of the cells; appropriate potassium nutrition can also increase the root-to-crown ratio and enhance crop water absorption capacity; under conditions of drought The appropriate potassium nutrition can promote the accumulation of proline, regulate the cytoplasmic turgor pressure to enhance the crop drought resistance; potassium nutrition can also reduce the loss of water by adjusting the stomatal movement and increase the utilization rate of soil water. 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