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Agronomic Effectiveness of Ammonium Orthophosphate and Ammonium Polyphosphate as Measured by Ion Uptake and Yield of Corn¹

ABSTRACT

Ammonium orthophosphate (AOP) and ammonium polyphosphate (APP) were compared as P sources for corn on an acid bottomland and an upland soil, both of which tested low in available P. Determinations were made for dry matter and ion accumulation by corn plants (Zea mays L.) harvested 30 days after emergence, and for grain yield. No significant differences (p = .05) were found between AOP and APP for any of the parameters measured. All significant differences determined were due to rate of applied P. In a related study to determine the interaction of P source, Zn, and lime rate on dry matter, ion accumulation, and yield of grain, no differences were observed due to source of P. Both sources of P were equally effective on corn production for the parameters measured.

¹ Journal Series Paper no. 511, University of Georgia College of Agr. Exp. Sta., Georgia Mountain Station, Blairsville. Work supported in part by the National Fertilizer Development Center, TVA, Muscle Shoals, Alabama.

² Assistant Agronomists, University of Georgia College of Agr. Exp. Sta., Georgia Mountain Station.

³ Agriculturist, Division of Agricultural Development, TVA.

Received for publication April 11, 1969. Accepted for publication November 7, 1969.