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Yields and Percentages of Crude Protein and Moisture of Several Annual Forage Crops as Affected by Harvest Date¹

Synopsis: Species exhibiting superior recovery capacity, rape and sudangrass, produced highest drymatter yields. Considering the first cutting only, differences in percent crude protein and dry-matter yields among crops were highly significant (P=0.01). Harvestdate delay, studied over a 3-week period, resulted in an approximate 340-pound-per-acre dry matter increase to each percentage point decline in crude protein. Moisture percentages of early-summer crops decreased more rapidly with advancing maturity than those of late-summer crops.

² Formerly Research Agronomist, Crops Research Division, ARS, USDA. Present address: Department of Agronomy, Iowa State University, Ames, Iowa. The helpful advice and counsel of May Wright in the statistical analysis of the experiment are appreciated.