Publication Date
1989
Description
In western Canada late season pasture yields vary considerably among species. During August and early September yields of Bromus riparius and Dactylis glomerata are double that of the more commonly grown Bromus inermis (Knowles and Sonmore, 1985). The importance of leaf area to crop growth rate pnor to canopy closure is well documented (Rhodes, 1973). Two components of leaf area are the final size of leaves and the rate of leaf appearance, with final size of leaves largely dependant on the rate of extension and duration of extension (Edwards, 1967). Since the maturity of a leaf is closely associated with the emergence of a new leaf there is a close association between rate of appearance and duration of extension (Edwards, 1967). Considerable variation has been shown among and within species for stem extension, leaf extension rate and rate of leaf appearance or duration of extension in response to temperature and photoperiod (Ryle, 1966; Nelson et al., 1978; Heide et al., 1985). Variations among species for late season productivity may be related to the influence of a declining temperature and photoperiod on leaf area and canopy development. The objectives of this study were to examine the extent to which and the mechanisms whereby temperature and photoperiotl affect leaf and stem extension of several grasses commonly grown m western Canada.
Citation
Esbroeck, G.A Van; King, Jane R.; and Baron, V S., "Effects of Temperature and Photoperiod on the Extension Growth of Six Temperate Grasses" (2025). IGC Proceedings (1989-2023). 64.
https://uknowledge.uky.edu/igc/1989/session1/64
Included in
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Effects of Temperature and Photoperiod on the Extension Growth of Six Temperate Grasses
In western Canada late season pasture yields vary considerably among species. During August and early September yields of Bromus riparius and Dactylis glomerata are double that of the more commonly grown Bromus inermis (Knowles and Sonmore, 1985). The importance of leaf area to crop growth rate pnor to canopy closure is well documented (Rhodes, 1973). Two components of leaf area are the final size of leaves and the rate of leaf appearance, with final size of leaves largely dependant on the rate of extension and duration of extension (Edwards, 1967). Since the maturity of a leaf is closely associated with the emergence of a new leaf there is a close association between rate of appearance and duration of extension (Edwards, 1967). Considerable variation has been shown among and within species for stem extension, leaf extension rate and rate of leaf appearance or duration of extension in response to temperature and photoperiod (Ryle, 1966; Nelson et al., 1978; Heide et al., 1985). Variations among species for late season productivity may be related to the influence of a declining temperature and photoperiod on leaf area and canopy development. The objectives of this study were to examine the extent to which and the mechanisms whereby temperature and photoperiotl affect leaf and stem extension of several grasses commonly grown m western Canada.
