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1, fertilizer selection. In order to increase ground temperature and promote root and root growth, humic acid and microbial fertilizers can be selected. Fertilizers should not be excessively flushed to prevent root damage. Foliar fertilizer pays attention to humic acid and amino acids. It not only raises leaves to enhance photosynthesis, but also can supplement nutrients (middle and trace elements) of plant growth and development. In addition, the selection of chitin, Feng harvest No. 1, moisturizing biological preparations, green wind 95, potassium dihydrogen phosphate can enhance plant disease resistance.
2, light. The more they are in unfavorable conditions of growing environment, the more plants need to see enough light to prevent the occurrence of diseases.
3, ventilation. Avoid misunderstandings: temperature first. To be properly ventilated, generally the first wind will pass from 11am to 1am. In the case where the temperature in the shelter permits, the wind will be reconnected for 20 minutes before covering. One disease prevention, two prevention of gas damage.
Second, the prevention and treatment of physiological diseases. If greenhouse vegetables encounter bad weather such as low temperature and cloudy snow days, they often cause flowers and fruit to fall off or be deformed, cracked, or damaged (eg eggplant, tomato). In addition to strengthening attention in watering, fertilizing (supplementing calcium, boron), etc., hormones can be used as appropriate to reduce the damage, such as cytokinins, naphthalene acetic acid, 2,4-D and so on.
First, the greenhouse vegetables to do a good job in cold, antifreeze work, the key is to enhance plant resistance.