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Some Responses of Alfalfa Varieties to Fertilization and Cutting Treatments¹

Synopsis: During a 2-year period the following significant alfalfa yield responses were noted: variety x P, variety x cutting treatment and variety x cutting treatment x P. The third year, when plots were harvested alike, significant interactions were: variety x P and previous cutting treatment x K. Several varieties displayed flexibility in response to management practices. As measured in the third year, Buffalo and Vernal were the highest yielding varieties over all treatments. Stand differences, though statistically significant, were small and were not reflected in yield.

² Formerly Instructor, Agronomy Department, Iowa State College, now Assistant Professor, Field Crops Department and Agent Agronomist, Agricultural Research Service, U.S.D.A., North Carolina State College, Raleigh, N. C.; Professor of Farm Crops; and Associate Professor of Soils. Agronomy Department, Iowa State College, Ames, Iowa.

Received for publication August 3, 1957.