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Effectiveness of Inorganic Nitrogen as a Replacement for Legumes Grown in Association with Forage Grasses. II. Nitrogen Content, Yield of Nitrogen, and Seasonal Distribution¹

Synopsis: Percent N and seasonal yield of N in pure orchardgrass and bromegrass stands were increased significantly by each increment of fertilizer N with 0, 30, 60, 120, and 240 pound-per-acre rates. Split applications of 120 pounds of N did not result in significant seasonal N yield increases. Application of fertilizer N to grass-legume mixtures resulted in increased yields of N and consistently increased the percent N in th grass component in the first harvest.

² Formerly Research Associate in Farm Crops (now Assistant Dean of Agriculture at Montana State College, Bozeman) and formerly Associate Professor of Agronomy (now Professor of Agronomy at the University of Wisconsin, in the Agronomy Department, Iowa State University.

Received for publication October 4, 1963.