| Abstract: Pot experiments were performed in a greenhouse to compare zinc (Zn) and iron (Fe) sources: 1) corn plants were grown in a Zn-deficient soil and received a Zn fertilization (0, 1.9, 3.8, and 7.7 mg kg-1; equivalent to 0, 5, 10, and 20 kg Zn ha-1) as ZnEDTA and ZnSO4; 2) sorghum plants were grown in a soil where iron chlorosis symptoms had been observed and received a Fe fertilization (0, 1.5, 3, and 6 mg kg-1; equivalent to 0, 3, 6, and 12 kg Fe ha-1) as Fe-EDDHA and FeSO4. Corn dry matter (DM), Zn concentration, and Zn uptake were higher with Zn-EDTA as compared to ZnSO4. In the sorghum experiment the highest DM production was obtained with Fe-EDDHA, which increased Fe concentration and uptake in higher proportion as compared to FeSO4. However,... |
