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Source and Placement of Zinc and Phosphorus for Corn (Zea mays L.)¹

ABSTRACT

The effects of source and placement of zinc and phosphorus were studied in several greenhouse experiments. A Zn and P deficient soil was utilized and sweet corn was grown as the test plant.

When Zn fertilizer materials were mixed well with the soil ZnSO₄ and organic sources such as ZnEDTA and Rayplex-Zn were equivalent in their effectiveness for the correction of Zn deficiency. However, if the fertilizer was banded under the seed, ZnEDTA was more effective than the inorganic sources.

A small amount of mixing appeared to improve the effectiveness of Zn, or P, or both fertilizers markedly.

Granulation greatly reduced the effectiveness of ZnSO₄, ZnNH₄PO₄, and Rayplex-Zn.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California, Davis. Presented before the Western Society of Soil Science, June 24, 1964, at Vancouver, B. C.

² Lecturer in Soils and Extension Soils Specialist, respectively.

Received for publication June 14, 1965. Accepted for publication September 8, 1965.