What does magnesium deficiency in grapes look like? With pictures and control methods
What harm does magnesium deficiency in grapes cause? What causes magnesium deficiency in grapes? How to prevent and control magnesium deficiency in grapes? We also ask netizens with grape growing experience to help introduce. Grapes are perennial climbing plants, generally cultivated in greenhouses or with trellis equipment, which means the vineyard soil cannot be plowed for a long time, causing the soil...
What harm does magnesium deficiency in grapes cause? What causes magnesium deficiency in grapes? How to prevent and control magnesium deficiency in grapes? We also ask netizens with grape growing experience to help introduceGrapes are perennial climbing plants, generally cultivated in greenhouses or with trellis equipment, which means the vineyard soil cannot be plowed for a long time, causing elements in the soil to deposit or leach away, thus producing deficiency symptoms. Today Zhongdiwang has compiled the harm, causes and control methods of magnesium deficiency in grapes, listed in detail below for netizens' reference.
I. Harm of magnesium deficiency in grapes:
When grapes lack magnesium, the interveinal areas of old leaves at the base of the vine clearly lose green color, turning yellow-white to gray-white, with a clear net-like vein pattern, and the veins turn purple; the veins of middle leaves are green, with yellow-green interveinal areas. Upper leaves appear water-soaked, then form larger necrotic patches; magnesium-deficient grapes color poorly, ripen late, and have low sugar content, but berry size and yield change little.
II. Causes of magnesium deficiency in grapes:
Magnesium deficiency in grapes is mainly caused by insufficient application of organic fertilizer or poor-quality organic fertilizer, leading to insufficient exchangeable magnesium in the soil. Because magnesium is more easily leached in acidic soil, heavy application of potassium fertilizer, lime or sodium nitrate will affect the grape's absorption of magnesium and easily cause magnesium deficiency. Also, after heavy summer rain, magnesium deficiency in grapes occurs noticeably.
III. Control methods for magnesium deficiency in grapes:
Method 1,Apply sufficient high-quality organic fertilizer when planting grapes.Click to view<什么叫有机肥>
Method 2,When magnesium deficiency symptoms begin to appear in grapes, spray the grape leaves with a 3%~4% magnesium sulfate solution, once every 20~30 days, for 3~4 sprays.Click to view<农用硫酸镁的作用>
Method 3,In vineyards with severe magnesium deficiency, apply 100 kg of magnesium sulfate per mu; magnesium sulfate can be applied in furrows, with 0.9~1.5 kg per mature vine, applied for two consecutive years. Mixing magnesium sulfate with organic fertilizer gives better results.
Note: In vineyards with severe magnesium deficiency, the amount of potassium fertilizer applied should be appropriately reduced. Balanced formula fertilization is recommended.
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