Causes of yellowing of vegetable leaf margin and preventive measures

Reasonable calcium. The loss of calcium is likely to cause the yellow leaf margin of the vegetable to turn yellow, and the leaf edge is rolled down to form a parachute leaf. Therefore, to prevent calcium deficiency, in the process of high temperature and drought, early spring and deep winter cultivation, fruits and vegetables need sufficient calcium fertilizer in the peak period. It is recommended to use chelated calcium fertilizer for foliar spray, compared with the effect of applying calcium fertilizer. it is good. It is best to supplement the calcium and boron to promote mutual absorption.

Reasonable temperature. When the temperature of the greenhouse is too low, the leaves become brittle, and the leaf edges will also yellow, and the parachute leaves can also be formed. When the temperature is too high, the leaf edge water evaporates quickly, which can cause the leaf edge to burn and yellow and dry. Therefore, the temperature of the greenhouse is balanced, and the new high-fat membrane is combined with the foliar spray to prevent not only the pathogen but also the humidity temperature of the plant itself.

Improve the soil. Excessive use of chemical fertilizers over the years can lead to soil compaction, soil salinization, poor root development, and gold margins on the edges of the leaves. Before the planting, the base fertilizer is applied with sufficient organic fertilizer and biological fertilizer to improve the soil;

Scientific medication. If the dosage is too large, the leaf edge will turn yellow, and the serious one will harm the flower and fruit. Therefore, it should be used according to the application book when using the medicine.