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.
