Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 8:285-288 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genotype x Management Interactions Among Plants of Orchardgrass (Dactylis glowerata L.)1

B. R. Christie and K. C. Armstrong2

Spaced plants of orchardgrass, from different accessions, were subjected to six different managements, involving combinations of two cutting regimes and three levels of nitrogen fertility. Accession means and intraaccession variances for vigor ratings, heading date, bloom date, plant height, percent leaf, and number of leaves per stem were calculated and analyzed. Level of nitrogen had little effect on means or variances nor was there a consistent accession x nitrogen interaction. The accession x cutting regimes interaction appeared to be unimportant.

Key Words: breeding • forage • genotypic variance • quantitative inheritance

1 Contribution from the Department of Crop Science, O.A.C., University of Guelph, Guelph, Ontario, Canada. Part of a thesis submitted by the junior author in partial fulfillment of requirements for the M.S.A. degree. Study supported by the Ontario Department of Agriculture and Food.

2 Associate Professor and formerly Graduate Assistant (present address, Cytogenetics Section, Ottawa Research Station, Ottawa, Ontario), Department of Crop Science, O.A.C., University of Guelph.

Received for publication October 18, 1967.




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