Zinc deficiency is routinely corrected by soil and/or foliar applications of zinc fertilizers. Zinc sulphate (ZnSO4) is the most widely applied inorganic source of zinc to soils or leaves due to its high solubility, low cost, and availability in the market.
Zinc can also be applied to soils in forms of zinc oxide and Zn-oxysulphate. The well-known organic compound of zinc fertilizers is zinc EDTA (ethylenediaminetetraacetic acid). However, due to its high cost, use of zinc EDTA in practical agriculture is limited. In addition, recent results show that, in cases of leaf spray, zinc sulphate is more effective than zinc EDTA in terms of increasing grain zinc concentration.