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Response of Several Corn Hybrids to Level of Water-Soluble Zine in Fertilizers¹

ABSTRACT

Fertilizers varying in level of H₂O-soluble Zn were prepared by combining fine ZnO and ZnSO₄ in various proportions and pressure-granulating the powders with ammonium nitrate, monoammonium phosphate, or ammonium polyphosphate. Forage yields and uptake of Zn by corn (Zea mays L.) grown on a P- and Zn-deficient soil in the greenhouse increased with the level of H₂O-soluble Zn in these macronutrient fertilizers. Additional crop response was slight to fertilizers with levels of H₂O-soluble Zn in excess of about 50% but this varied, depending upon the macronutrient carriers. However, the amounts of Zn extracted after cropping from untreated soils and soils initially receiving 12 mg of Zn per 3 kg of soil in a highly H₂O-soluble form were comparable.

In a second experiment differential response of several corn hybrids to amount of P and Zn and level of Zn solubility in the fertilizers suggests that the test variety might influence the interpretation of the results from fertilizer evaluation studies. No relationship was found between P/Zn ratios in the corn forage and the seed. The P/Zn ratios in corn forage were not related to the response of corn to applied Zn.

Contribution of the Soils and Fertilizer Research Branch, National Fertilizer Development Center, TVA, Muscle Shoals. Ala. Presented in part at the Agronomy Section of the Association of Southern Agricultural Workers, Jan. 30, 1967, at New Orleans, La.

² Soil Chemists.

Received for publication June 3, 1968. Accepted for publication August 13, 1968.