It is a physiological hazard that yellow leaves and abnormalities of vegetables are not caused by infections. The emergence of such hazards reflects some misunderstandings in our management process. We must promptly adjust the management methods so as not to cause greater harm. The main reasons are as follows. Calcium deficiency: Calcium plays a very important role in the growth of fruits and vegetables. If the metabolism of calcium is imbalanced, the leaves in the upper and middle leaves tend to turn yellow, and the leaf margins roll down to form parachute leaves. If the calcium deficiency is very serious, the new leaves of the melon crop (especially cucumber) grow yellow and dry during the low temperature cultivation. Control methods: to prevent calcium deficiency, especially in high temperature and drought, as well as in early spring and deep winter cultivation, fruits and vegetables need sufficient calcium fertilizer in the fruitful period. It is recommended to use chelated calcium fertilizer for foliar spray, compared with flush calcium. Fertilizer effect is good. The best calcium and boron complement, promote mutual absorption. The temperature is too low or too high: the temperature in the greenhouse is too low, the blades become brittle, and the leaves are yellow, and parachute leaves can also form. If the temperature is too high, the leaf edge moisture will evaporate quickly, causing leaf edge burns and yellowish dryness. Control methods: balance the greenhouse temperature, combined with foliar spray chitin, alizarin and other conditioning agents, the best combination of potassium dihydrogen phosphate. Deterioration of the soil environment: Excessive chemical fertilizers used in successive years will lead to soil compaction, soil salinization, poor root development, and the formation of gold margins on the leaf margins. Control methods: Comprehensive improvement of the soil, application of adequate basal fertilizer organic fertilizer and biological bacteria fertilizer, improve the soil; pay attention to the application of chitin, fulvic acid, alginic acid and other strong roots fertilizer. Pharmacy injury: excessive use of drugs, or high temperature medication caused by injury can cause yellowing of the leaf edge, severe damage to flowers and fruits, including the harm of aerosols. Control methods: Foliar spray nuclear acid and cytokinin to alleviate the damage.
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