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Abstract

 

This article in CS

  1. Vol. 9 No. 6, p. 785-787
     
    Received: May 9, 1969


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doi:10.2135/cropsci1969.0011183X000900060034x

Response of Smooth Bromegrass Genotypes to Cutting1

  1. E. L. Nielsen,
  2. P. N. Drolsom and
  3. P. W. Voigt2

Summary

Summary

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.

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