Zinc fertilizer should be applied before the corn flare period. If the symptoms of zinc deficiency have been shown, spraying the zinc-containing foliar fertilizer in time can effectively alleviate it. Zinc fertilizer should be applied or sprayed with base fertilizer, but it is the best for base fertilizer. When applying fertilizer, it should be applied or applied. The zinc sulfate base is used for 1~1.5 kg per mu. If sprayed, the concentration is controlled at 0.2%, and 2~3 barrels of water per acre. In addition, corn can also be added with other micro-fertilizers, such as boron fertilizer (0.5 kg per mu of boric acid) and manganese fertilizer (1 to 2 kg per mu of manganese sulfate), especially alkaline soil, and the application of micro-fertilizer can significantly increase production.
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