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Effect of Soil Type, Fertilization, and Stage of Growth on Yield, Chemical Composition, and Biological Value of Ladino Clover (Trifolium repens L.) and Alfalfa (Medicago sativa)¹

Synopsis: In a 4-year Wisconsin study, greatest yields resulted on Miami silt loam and from cutting at intermediate growth stage. Yield increases from fertilization were greatest on soil types of lower productivity field rating. Highest contents of P, K and N resulted in forage harvested on soil types of medium to high ratings, and from pasture stage harvests. Contents of P and K were increased, Ca decreased, and N unchanged by fertilization. Forage nutritive value measured in guinea pig feeding trials compared closely to field ratings of the soil types.

² Formerly Research Assistant, Department of Agronomy, University of Wisconsin, now Assistant Professor of Horticulture, University of Wisconsin; former Research Assistant, Department of Agronomy, University of Wisconsin, now Associate Professor of Agronomy, University of Illinois; and Associate Director of Extension and Professor of Agronomy, University of Wisconsin. Grateful acknowledgments are given to the Departments of Biochemistry and Soils for providing laboratory facilities for biological assays and chemical analyses. The authors are indebted to Dr. J. H. Torrie for assistance in the planning and statistical analyses of the experiments.