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Response of Corn to Small Amounts of Fertilizer Placed with the Seed: IV. Comparison of Dry and Liquid Forms¹

Powdered and granular fertilizers containing 13.3, 23.1, and 11.0% N, P, and K, respectively, were prepared along with water solutions of the same material containing 10.5 and 4.4% P. These fertilizers were banded with the seed of corn (Zea mays L.) in greenhouse trials in which respiration rate, axis length, emergence, dry matter yield, and N, P, and K content were measured. No differences in nutrient availability were found between liquid and dry fertilizers studied. Granular and powdered materials were equal in toxicity. They were more toxic to corn seedlings, as measured by axis length, emergence, or dry matter yields, than the less concentrated liquid materials applied at rates providing the same total quantities of plant nutrients. Use of dilute (low-analysis) fertilizers is probably not a practical way of reducing toxicity because of the amount of dilution required.

Key Words: N • P • K • Emergence • Respiration

² Graduate Assistant and Professor respectively. The senior anthor is now at the Department of Agronomy, Ohio State University, Columbus, Ohio 43210.

Received for publication June 16, 1970.