Since magnesium is a component of chlorophyll, the deficiency of magnesium in crops usually manifests as chlorosis of the leaves, generally chlorosis between veins, while veins remain green. For leaves with equal veins (such as corn), the chlorosis of the leaves is stripe-like, whereas for the crops with reticular veins, the leaves are green with spots, which is a typical symptom of magnesium deficiency. For example, corn lacks magnesium, and yellowish stripes appear between the veins of the lower leaves, showing stripes and mosaics, and sometimes rosary-like stripes are faintly visible. Severe magnesium deficiency in the veins died of dry, purple-red spotted leaves.
Prevention:
1 Apply magnesium fertilizer. General field crops use magnesium sulphate as the base fertilizer, with a dosage of 10-15 kilograms per acre. They can also be sprayed with 1%-2% magnesium sulfate solution.
2 pay attention to potassium and magnesium nutrient balance. Potassium and magnesium have strong antagonism. Attention should be paid to potassium and magnesium nutrient balance, which can prevent magnesium deficiency induced.
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