What are the nutrients missing from brown spots on new crop leaves?

The appearance of brown spots on the new crop leaves is mostly a symptom of Mn deficiency. Generally, the leaf color of the new leaves is chlorotic, the veins are yellow, and the chlorotic parts often have brown spots or striae, and may be necrotic and perforated. For example, soybeans lack Mn, the leaves are pale green, and the veins remain green. When the leaves are severe, the old leaves fall off prematurely, and the leaves are not smooth, Zou shrinks, and there are brown spots with brown spots. Potato leaves were light green or yellow, almost yellow-white when severe, and brown necrotic spots appeared along the veins. Symptoms mostly occurred on the back of the leaves. Control measures: (1) Manure applied to the soil. General field crops use manganese sulfate as the base fertilizer, with a dosage of 1 kg per mu. (2) Foliar manganese spray. Can be sprayed with 0.1% -0.2% sulfuric acid solution; can also be sprayed liquid micro-fertilizer, dilution factor based on product use.

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