The early stage of the eggplant overwintering in the greenhouse is in the low temperature and weak light period. During this period, the root system has a weak ability to absorb fertilizer and water, and is susceptible to abnormal symptoms due to lack of nutrients. Young leaves yellowing Symptoms: Young leaves are bright yellow-white, with remaining green tips, and rust-colored streaks appear on the middle and lower leaves. The cause of the disease is fertility, high humidity, and acidity in the soil; excessive manganese inhibits the absorption of iron and causes yellowing of new leaves. After the prevention and treatment method, spray 500 times ferrous sulfate on the leaves; apply magnesium hydroxide and lime in the field to adjust the pH of the soil; supplement potassium to balance nutrients, which can satisfy or promote the supply of iron. Buds not open Symptoms The ovary is not enlarged, and the flower buds are shrunk and not open, which affects pollination and fertilization to form rigid fruit. The cause of the disease is in the cold season, the field lacks water, the air is humid, the soil pH is above 7.5, and the effectiveness of soil autogenous boron is reduced; there is excessive lime calcium in the field, which adsorbs boron and induces boron deficiency in plants, which can cause the flower buds to not open for a long time. The prevention method is 700 times of borax spray on the leaf surface. Stiff fruit Symptoms The fruit is stiff but not swollen, the skin color is dull, with white stripes, the fruit is cracked after watering, it does not grow large, and the quality is poor. After the eggplant skin is cork, the fruit will crack if watered in a sunny day. The cause of the disease is the period of low temperature and low light, when the fruit is enlarged, the demand for nitrogen, potassium, and boron is large, and the relative demand for phosphorus is small. If the input of phosphorus is too large, it will inevitably affect the absorption of potassium and boron, making the fruit seeds more and less fleshy and rigid . Control methods Phosphate fertilizer is mainly applied in the planting furrow, and 2 to 3 kg of pure phosphorus per acre is applied in the later period, and potassium fertilizer is mainly applied in the fruiting period. Prevent falling leaves and fruit Symptoms During the low temperature period, the lower leaves are yellow and fall off, and the young fruits soften and fall. Causes of Zinc deficiency causes a decrease in the synthesis of gibberellin in plants, and the joints between petioles and stalks, and fruit stalks and fruits form a separation layer and then fall off. The prevention and control methods sprayed 700 times solution of zinc sulfate on the leaves of aging seedlings to prevent falling and promote growth. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Dental Nitrile Gloves,Nitrile Gloves Large,Eu Medical Dental Gloves,Gloves Nitrile Disposable Gloves Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshihealths.com