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Response of Corn (Zea mays L.) to Zinc, as Affected by Placement and Nitrogen Source¹

ABSTRACT

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.

¹ Contribution of the Soils and Fertilizer Research Branch, Div. of Agricultural Development, TVA, Muscle Shoals, Ala. Presented in part at the Western Soil Science Society meetings, June 23, 1965, at Riverside, Calif.

² Soil Chemists, TVA., and former Soil Physicist, TVA, now Soil Physicist, ARS, USDA, Pullman, Wash., respectively.

Received for publication April 25, 1966. Accepted for publication August 4, 1966.