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Published in Crop Sci 9:785-787 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Response of Smooth Bromegrass Genotypes to Cutting1

E. L. Nielsen, P. N. Drolsom and P. W. Voigt2

The response of Bromus inermis Leyss. genotypes to different intensities of clipping was studied in two experiments. In Experiment 1, 29 selected plants were propagated in individual rows, one half clonally and one half from open-pollinated seed. Alfalfa was interseeded between rows. The areas comprising the two propagation methods were each subdivided into 3-cut early, 3-cut late, and 2-cut harvest schedules. Two cutting heights were employed on each. Growth recovery observations resulted in highly significant differences ascribed to genotypes, cutting schedules, and heights of cut. Propagation method was not significant. It was concluded that genotype response to defoliation could be evaluated in seeded rows.

Experiment 2 involved seed-propagated rows of 81 top-cross bromegrass progenies overseeded with alfalfa. Significant genotypic differences in response to clipping occurred following 3 years of the same harvest schedules used in Experiment 1. Persistence under either of the 3-cut schedules was poor, a portion of which was ascribed to ecological factors. The vigor of genotypes, measured by residual yields of 2-cut plots, was significantly better at the higher stubble height.

Key Words: Bromus inermis • Recovery growth

1 Results of cooperation between the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and the Wisconsin Agricultural Experiment Station, Madison, Wisconsin 53706.

2 Research Geneticist, Crops Research Division, ARS, USDA, and Prof. of Agronomy (deceased); Prof. of Agronomy; and former Project Associate (Now Research Geneticist, Crops Research Division, ARS, USDA, Woodward, Okla.) Wisconsin Agricultural Experiment Station.

Received for publication May 9, 1969.




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