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Effect of Nitrogen and Potassium Fertilization, Stubble Height, and Clipping Frequency on Yield and Persistence of Orchardgrass¹

Synopsis: Nitrogen was a major factor influencing yields the year of treatment. Close clipping reduced the stand of nitrogen-fertilized orchardgrass. Potassium effects were most striking for the longer growing periods during the year of treatment. Potassium carry-over effects were highly significant for all growing periods.

² Eastern Agronomist, American Potash Institute, Washington, D. C., and Director of Research, American Farm Research Association, Lafayette, Ind. (Formerly Associate Professor of Agronomy, Purdue University.)

Received for publication April 18, 1964.

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