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Effect of Nitrogen, Phosphorus and Potassium Fertilizer on the Economics of Producing Bluegrass Forage'¹

Synopsis: Responses of a native bluegrass sod to topdressed applications of N, P and K fertilizer rates varying jointly were used to fit a forage yield equation and to calculate iso-yield curves and least cost fertilizer ratios. It was then shown how these data and equations may be used in determining levels of fertilizer for optimum beef production and estimating the price of beef needed to justify fertilization of this type of sod.

² Research Associate, Professor of Soils, and Professor of Economics, respectively. The senior author is now Assistant Agronomist, University of Tennessee Extension Service.

Received for publication July 5, 1962.