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Selection criteria in grass breeding. IV. Effect of nitrogen and spacing on yield and its components

Published online by Cambridge University Press:  27 March 2009

Alec Lazenby  and
H. H. Rogers
Alec Lazenby
Affiliation:
School of Agriculture, University of Cambridge
H. H. Rogers
Affiliation:
Plant Breeding Institute, Cambridge
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Extract

1. The effects of applied nitrogen (0, 200, 400, 600, and 800 lb. per acre per annum) and spacing (widely spaced plants and simulated monoculture swards) on average yields and yield components of eight clones of Lolium perenne are reported for four harvests taken each year during 1962 and 1963.

2. During both years, higher yields per unit area were obtained from swards than from spaced plants; the degree of difference varied from harvest to harvest.

3. A greater effect of nitrogen on yield was detected in 1963 than in 1962, an effect especially marked in swards at lower rates of nitrogen application. A highly significant nitrogen x spacing interaction on yield was detected in 1963.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 65 , Issue 1 , August 1965 , pp. 65 - 78
Copyright
Copyright © Cambridge University Press 1965

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