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The influence of climatic factors on physiological development in perennial ryegrass
Authors:J D H KEATINGE  M S CAMLIN†  R H STEWART
Institution:Department of Agricultural &Food Chemistry Queen's University of Belfast;Department of Agriculture for Northern Ireland Field Botany Research Division, Northern Ireland
Abstract:Dates of initiation of reproductive development and of ear emergence were determined for four cultivars of perennial ryegrass (Lolium perenne) representing a range in maturity from early to late in a single trial in 1977. The influence of climatic factors upon the reproductive development was investigated and it was found that, while day-length largely influenced the dates of initiation, subsequent growth and development towards ear emergence was influenced mainly by temperature. The data indicated that cultivars may have similar requirements in terms of accumulated temperature between the physiological growth stage of initiation and the agronomically significant growth stage of ear emergence. The possibility of achieving greater accuracy in forecasting ear emergence dates by relating meteorological data to the physiological development of the individual cultivars is suggested.
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