What is the lack of nutrients in the old leaf stripe of the crop?
Since magnesium is an integral part of chlorophyll, when a crop is deficient in magnesium, it usually appears that the leaves are chlorogenic, and in general the veins chlorosis, while the veins remain green. For leaves with parallel veins (such as corn), the chlorosis of leaves is stripe-like, while in reticular veins, the chlorosis of leaves is patchy, 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 measures: (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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