In the whole process of growth and development, solanaceous vegetables should supply sufficient nitrogen, so as to fully carry out photosynthesis, thereby increasing the dry matter content. When nitrogen is lacking, the lower leaves tend to age and fall off. If nitrogen fertilizer can be applied in time, the plants can return to normal growth. The late application of N fertilizer will delay the restoration of the plant's aboveground and underground parts and cause injury. In the later period of fertility, if there is a lack of nitrogen, the number of flowers will be reduced, the quality of flowers will be poor, and the number of short hops will increase, and the fruit set rate will decrease. In the fruit set, nitrogen deficiency during fruit enlargement, the yield will be lower. Phosphorus also has a great influence on the growth and development of solanaceous vegetables. The lack of phosphorus at the early stage of development will not only reduce the quality of flowers, but also reduce the number of flowers. When there is sufficient potassium, the photosynthesis of solanaceous vegetables is strong, which promotes fruit enlargement. Therefore, the three elements of nitrogen, phosphorus and potassium should be fully supplied, so as to increase the leaf area, improve the photosynthetic capacity of the leaves, and significantly increase the yield and quality. In the late stages of growth and development, when the fruit is inflated, it is necessary to supply both potassium and nitrogen fertilizers. When the potassium and nitrogen contents are relatively high, the absorption of potassium is relatively large, which can significantly promote but enlarge. When picking the young fruit, it is more appropriate that the amount of potassium and nitrogen or the amount of potassium is slightly less than that of nitrogen.
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