Zinc is an indispensable trace element for crop growth. Zinc deficiency causes plant dwarf, short internodes, leaf expansion and elongation are inhibited, leaflets appear, and leaf margins are distorted and wrinkled. Corn whitening seedlings, rice dead seedlings, etc. are all caused by zinc deficiency. There are four ways to control zinc deficiency in crops: 1. Seed dressing: Dissolve zinc sulfate in a small amount of water, mix well with seeds, and dry it for seeding. 2. Soaking seeds: soaking with zinc sulphate solution, corn can be soaked for 6-8 hours, the solution concentration is 0.02%~0.05%; rice can be soaked for 12 hours, the solution concentration is 0.1%. 3. Foliar application: 0.1% concentration of zinc sulfate can be sprayed immediately after the zinc deficiency symptoms appear in the early stage of crop growth, and sprayed again every 7 to 10 days. 4. Soil application: mixed with other fertilizers for base fertilizer application, the dosage is 1~3 kg per mu, pay attention to even application.
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