Response of Corn (Zea mays L.) to Zinc, as Affected by Placement and Nitrogen Source
1966
Giordano, P. M. | Mortvedt, J. J. (John J.) | Papendick, R. I.
Dry matter production and uptake of Zn, N, and P by corn grown in greenhouse pots were higher with (NH₄)₂SO₄ than with anhydrous NH₃ or CO(NH₂)₂, whether ZnSO₄ was mixed, spotplaced, or not applied. These results are largely explained by the lower soil pH associated with application of (NH₄)₂SO₄ and hence, the increased availability of indigenous and applied Zn. Yields were lower when Zn was mixed, but higher when Zn was omitted or spot-placed 4 weeks prior, as compared to treatment just prior to planting. In general, Zn and N uptake varied directly with yield and inversely with P uptake, except where growth was extremely poor due to severe Zn deficiency.
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