Pictures and prevention methods of magnesium deficiency in grape

What is the harm of magnesium deficiency in grapes? What causes magnesium deficiency in grapes? How to prevent and cure magnesium deficiency in grapes? Netizens with experience in grape cultivation are also asked to introduce grapes as perennial lianas, which are generally cultivated in greenhouses or equipment scaffolding, resulting in the vineyard soil being unable to plough for a long time, resulting in the deposition or loss of elements in the soil. resulting in symptoms of element deficiency. Today, the farming network has sorted out the harm, causes and prevention methods of grape magnesium deficiency, which are listed in detail below for netizens' reference. First, the harm of grape magnesium deficiency: when the grape is magnesium deficient, the veins of the old leaves at the base of the grape obviously lose green and show yellow-white to gray-white, with clear reticular veins and purple veins; the leaf veins in the middle of the grape are green and yellowish green between the veins. The upper leaves of grapes showed water stains and large necrotic patches were formed. The grapes with magnesium deficiency had poor coloring, delayed ripening and low sugar content, but the particle size and yield did not change much. Second, the cause of magnesium deficiency in grape: the magnesium deficiency in grape is mainly caused by the lack of organic fertilizer or the poor quality of organic fertilizer, which leads to the lack of replaceable magnesium in soil. Because magnesium is easily lost in acidic soil, a large amount of potassium fertilizer, lime or sodium nitrate will affect the absorption of magnesium by grapes, which is easy to cause magnesium deficiency. In addition, magnesium deficiency in grapes will occur significantly after heavy summer rains. Third, the prevention and treatment of magnesium deficiency in grapes: method 1. Apply enough high-quality organic fertilizer during grape planting. Click to view method 2. When magnesium deficiency begins to occur in grapes, magnesium sulfate solution with a content of 3%-4% can be sprayed on the leaves of grapes, once every 20-30 days, requiring spraying 3-4 times. Click to view method 3. In vineyards with serious magnesium deficiency, 100kg magnesium sulfate per mu can be applied, magnesium sulfate can be applied by trenching, and 0.9-1.5 kg per adult grape plant for two consecutive years. The effect of mixed application of magnesium sulfate and organic fertilizer is better. Note: the amount of potash fertilizer should be reduced appropriately in vineyards with serious magnesium deficiency. Balanced formula fertilization is advocated. The method of improving the Fruit setting rate of Grape Prevention and Control of Grape anthracnose