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Effects of Cutting Frequency of Orchardgrass and Nitrogen Rate on Yield, Plant Nutrient Composition, and Removal¹

Synopsis: Nitrogen fertilization greatly increased dry matter and crude protein yields over a 4-year period. Less frequent harvest improved the efficiency of N in terms of dry matter production but had negligible effect on crude protein. Plant nutrient removal by the forage was directly related to N rate. Separate of N, the K, content and removal in forage were much more affected by N fertilization than were those of other nutrients.

² Associate Soil Scientist, Assistant Soil Scientist, and Senior Experimental Aide, respectively. Western Washington Experiment Station, Puyallup. Wash.

Received for publication October 21, 1963.

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