The lack of magnesium in bananas results in a gradual yellowing of the leaf margin toward the middle ribs, a change in phyllotaxis, a purple spot on the petiole, and necrotic and scattered edges on the leaf sheath. The common symptoms in the field are the green edges of the old leaves, and the chlorosis between the edges and the middle ribs. Slow growth of plants and shorter leaf life.
Control methods: The most fundamental measure is to apply high-quality organic fertilizer when the grape is planted. For adult trees, high-quality organic fertilizer should be added before the winter; the vineyard with serious magnesium deficiency should reduce the amount of potassium fertilizer in an appropriate amount; When the plants began to show symptoms of magnesium deficiency, the leaves were sprayed with 3 to 4% of magnesium sulfate and sprayed for 3 to 4 times during the growing season; in the case of magnesium-poor soil, magnesium sulfate may be considered to be about 100 kg per mu.
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