The symptoms of grapevine deficiency in the protected areas in early spring are mainly expressed on the leaves. In most cases, the young leaves after sprouting are slowly stretched, slowly turning green, and the leaves are smaller. Then, starting from the leaves of the stem, the tissues between the veins are shiny, the leaf margins turn yellow and gradually extend between the veins, and the corrugated bands are formed between the stretched yellow areas and the green vein areas. In severe cases, the yellow band browns away and the leaves shrink. The fruit is characterized by slower growth and different sizes. These symptoms are mainly caused by magnesium deficiency. In some cases, the leaf margins of the stems chlorotic yellow, and then brown necrotic spots develop, and develop into the interlobular tissue. In severe cases, the leaf margins are dry, the leaves are shrunken, the fruit is small, the sugar is low, and the fruit is not colored. . These symptoms are mainly caused by potassium deficiency. Some farmers mistakenly treated the above symptoms as infectious diseases, but they did not work. We identify it as a deficiency according to years of symptom recognition and treatment. It is a physiological disease. 1. Causes of morbidity (1) The grapes in the protected area are in the period from the middle of March to the end of April. Before and after the flowering period, the new shoots have a large amount of growth, which is when the northwestern air current is frequently active. Sustained low temperatures, poor root absorption, resulting in nutrient absorption can not meet the needs of plant growth. (2) Excessive application of available nitrogen and phosphorus fertilizers results in an imbalance in the availability of soil fertilizer and an antagonistic effect on the absorption of potassium and magnesium. (3) soil compaction, low moisture, poor physical and chemical properties. 2. Prevention and control methods (1) Strengthen the cold insulation measures in the protected areas. Covering the ground with mulch and plant stalks protects the soil temperature. Enhances the physiological activity of the plant. (2) Increase the use of organic fertilizers to improve soil water, fertilizer, gas, and heat conditions and apply fertilizers to ensure adequate and balanced nutrition for the plants. (3) The targeted use of top-dressing fertilizers can effectively delay the development of symptoms and promote the growth of plants.
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