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Effect of Clipping and Nitrogen Fertilization on Forage and Grain Yields of Spring Oats¹

Synopsis: Delayed or repeated clipping beyond the 4-leaf stage increased forage yield of two oat varieties. Single clippings at the 4-, 5-, and 7-leaf stage reduced grain yield by 9, 28, and 98%, respectively. Clipping retarded floral development and reduced lodging and test weight. Nitrogen fertilization did not compensate for the deleterious clipping effect.

² Associate Professor of Agronomy, Iowa State University, and Associate Professor of Horticulture, Oklahoma State University (formerly Assistant Professor of Agronomy, Iowa State University), respectively.

Received for publication December 14, 1959.