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(a) Effects of increasing soil Zn supply in form of ZnO on growth of maize plants on a Zn-deficient calcareous for 20 days (bottom), 27 days (middle) and 35 days (top). (b) Effects of increasing soil Zn supply in form of ZnSO4 on growth of maize plants on a Zn-deficient calcareous for 20 days (bottom), 27 days (middle) and 35 days (top). Zinc has been applied at the rates of 0, 0.5, 1, 2.5 and 7.5 mg Zn kg−1 soil in form of ZnO and ZnSO4.
