Response of Corn to Zn-EDTA and ZnSO4 in Field Investigations
1969
Schnappinger, M. G. | Martens, D. C. | Hawkins, G. W.
Field experiments were conducted in 1968 to determine the effect of rates of Zn-EDTA and ZnSO₄ application on yield and Zn content of corn (Zea mays L.) grown on Litz silt loam and Norfolk loamy fine sand. Placement of Zn-EDTA was also included as a variable in the experiment on the Norfolk soil. Corn plants on the Norfolk soil “grew out” of Zn deficiency; whereas plants on the Litz soil remained stunted throughout the growing season. Highest corn grain yield occurred on both soils where ZnSO₄ was broadcast at a rate of 14 kg Zn/ha. Rates of 2.24 kg Zn/ha as broadcast Zn-EDTA and of 1.12 kg Zn/ha as banded Zn-EDTA increased corn yield on the Norfolk soil. A higher rate of 4.48 kg Zn/ha as broadcast Zn-EDTA was required to increase corn yield on the Litz soil. The ear leaves of corn plants on check plots of the Litz and Norfolk soils contained 10.8 and 12.4 ppm Zn, respectively, during the silk stage
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