In the production of vegetables in protected areas, due to the quest for high yields and eagerness, some farmers still fertilize large amounts of nutrients under high soil nutrient content, especially when large amounts of nitrogen fertilizers are used, causing nitrogen excess disease. The symptoms are generally as follows: melon vegetables are long and susceptible to disease. Leaves are hypertrophic and dark green. The middle and lower leaves are curled. The petioles are slightly drooping and the veins are uneven. There are obvious spots, and then the leaves turn yellow and wilt. The fruit is small. Fruit vegetables such as tomatoes show an inverted triangular shape, long internodes, and brown spots on the stems. The leaves are large and dark green, soft and susceptible to disease, curled leaves, and raised ribs in the leaflets. Other vegetables are generally plant leggy, mainly leaves thick green. To avoid the occurrence of nitrogen overload disease, we must first pay attention to ideological considerations, implement soil testing and fertilization, according to the soil nutrient content and crop needs, apply a reasonable mix of N, P, K and other trace elements in scientific applications, in particular, do not blindly large-scale application of nitrogen fertilizer. In soils with high nutrient content, it is advocated to use decomposed farmyard fertilizers, in combination with appropriate amount of nitrogen fertilizer. If the symptoms of potassium deficiency and magnesium deficiency are found in crops, the cause should be analyzed first. If there is a deficiency of nitrogen due to excess nitrogen, the surplus should be mainly solved, and the fertilizer that is lacking should be used in combination. For plots where excess nitrogen has been found, when the ground temperature is high, the amount of irrigation water can be increased, the amount of propagating fertilizer can be sprayed, and the duration of light can be prolonged. At the same time, attention should be paid to control of pests and diseases such as aphids and downy mildew.
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