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Published online 1 September 1968
Published in Agron J 60:576-577 (1968)
© 1968 American Society of Agronomy
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Response of Plants to Polyphosphate on Calcareous Soils1

J. L. Stroechlein, S. A. Sabet and D. M. Clementz2

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

1 Contribution of the University of Arizona Agr. Exp. Sta. as Technical Paper No. 1310. This project was supported in part by the Tennessee Valley Authority.

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.




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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1968 by the American Society of Agronomy.