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Effects of Oats-Rape Interseeding and Lamb-Grazing on Corn Yield¹

Synopsis: Early-summer interseeding of an oats-rape mixture in corn followed by mid-summer to fall pasturing with lambs generally caused a loss in corn yield during 1960 to 1962. Lamb gains were variable, and usually not sufficient to offset corn yield losses. Under ideal corn-growing conditions and with a 43-day grazing period (July 20 to September 1), corn yields were not adversely affected by the interplanted crop or the grazing lambs in 1961. Corn yields and lamb gains generally decreased when grazing continued after early September.

² Research Agronomist, Crops Research Division, ARS, USDA; Associate Professor of Animal Husbandry, University of Minnesota; and Associate Professor of Agronomy, Iowa State University (formerly Research Agronomist, CRD, ARS, USDA) . Experiment I was conducted by Jordan and Wedin, and experiments II and III by Jordan and Marten.

Received for publication July 26, 1963.