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An Evaluation of Nitrogen Fertilization in Legume-Grass and All-Grass Pasture¹

Synopsis: A simple legume-grass mixture was more productive than a grass + N mixture in 1958 but less productive in 1959, following legume depletion due to winter-killing. A low rate of nitrogen applied to depleted legume-grass swards was economically superior to high rates on either legume-depleted or all-grass pastures, but especially the latter. Results over the 5-year period suggest the desirability of seeding simple legume-grass mixtures with limited nitrogen amendments after legume depletion rather than seeding of either complex or all-grass mixtures.

² Formerly Research Agronomist, Crops Research Division, ARS, USDA, presently Professor of Agronomy, Iowa State University, Ames; Professor of Dairy Husbandry; and Research Agronomist, Crop Research Division, ARS, USDA.

Received for publication August 13, 1964.