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Effect of Limimg and Potassium Fertilization on the Yield and Composition of an Alfalfa-Orchardgrass Association¹

Synopsis: Liming increased the dry matter yields of oats and of an alfalfa-orchardgrass mixture. Response to K increased with increased base saturation of the soil, and survival of alfalfa plants on soil limed to pH 5.5 or higher was largely dependent on K supply. Alfalfa was the dominant species where there was sufficient K for both components and orchardgrass dominated where K was limited. Total available carbohydrates in the storage organs of each species increased with K fertilization.

² Formerly Graduate student (now Soil Specialist, Canada Experimental Farm, Nappan, N. S.) and Professor of Soil Technology (now Emeritus Professor of Agronomy) Cornell University.

Received for publication January 28, 1963.