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Response of Orchardgrass, Dactylis glomerata L., to Nitrogen Fertilization and Time of Cutting¹

Synopsis: Yields of orchardgrass were increased significantly by NH₄NO₃ and NH₃ in 1956 in southern Iowa. First cutting yields from NH₃ were reduced because of applicator tillage effects under drouth conditions. Nitrogen carryover was significant. Plots first cut on May 10, 1957, produced lower yields than those cut for the first time on May 1, 20, or 30. Plots cut first time on May 30 yielded highest; nitrogen content was highest on those cut first May 1.

² Associate Professor of Farm Crops (now at University of Wisconsin), Graduate Assistant, and Professor of Soils, respectively, Agronomy Department, Iowa State University.