Zinc application in the soil is the most commonly used method. It can be applied in both the application and the application. It is the best time to apply zinc in the soil before sowing. Before planting or transplanting, generally apply 1.5-5.0 kg of zinc sulfate per mu. Foliar application is suitable for fruit trees and vegetables, but it is an emergency measure for zinc deficiency in crops. It is suitable for early stage of crop growth, with a concentration of 0.05%-0.1% zinc sulfate, and a 0.5% zinc sulfate solution for fruit trees. Seed treatment can be soaked with 0.1% zinc sulphate solution or used as seed coating for rice, cotton, etc.; and rooting with 2%-4% zinc oxide suspension is a cost-effective method. The residual effect of zinc in the soil is generally 3-5 years. According to the soil, the results of plant analysis determine whether or not to apply zinc fertilizer. (Source: China Fertilizer Network)
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