Long-term phosphorus fertilization effects on crop yields and soil phosphorus.
Karamanos, R.E., J.T. Harpiak, and G.A. Kruger. 2007. Better Crops. 91(2): 25-27.

ABSTRACT

Discontinuing P fertilization after 20 years of annual application of 27 lb P2O5/A resulted in significant reduction in barley grain yield, with losses of 21% where P had been applied in the seedrow, 12% where P had been banded with N, and 15% where P had been applied one-third in the seed row and two-thirds banded. While minor benefits to residual soil P were measured from annual application, continued fertilizer P use was required to achieve optimum yields.

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