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Response of Plants to Polyphosphate on Calcareous Soils¹

Ammonium polyphosphate (APP) was compared to ammonium orthophosphate (AOP) with successive crops grown on four calcareous soils in the greenhouse. Barley (Hordeum vulgare) the first crop, responded to P on three of the soils, with AOP superior to APP on two soils. With tomatoes (Lycopersicon esculentum), the second crop, APP was significantly better than AOP on all soils. APP was a satisfactory P source and was superior to AOP for the second crop.

Key Words: ammonium polyphosphate • availability

² Associate Professor, Head of the Soil Fertility and Plant Nutrition Unit, Desert Institute, Cairo, U.A.R., and former undergraduate student (present address, Agronomy Department, Purdue University, Lafayette, Ind. 47907).

Received for publication January 15, 1968.