科研之友
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摘要
As water resources become limiting, the need to produce stable amounts of herbage with a high nutritive value increases. An understanding of how levels of irrigation affect crude protein (CP) and neutral-detergent fibre (NDF) concentrations and, in vitro true digestibility (IVTD), is critical in the management of pastures. Smooth bromegrass (Bromus inermis Leyss.), prairiegrass (Bromus willdenowii Kunth), hybrid-bromegrass [meadow (Bromus riparius Rehm.) x smooth bromegrass], creeping foxtail (Alopecurus arundinaceus Poir.) and RS wheatgrass (Elymus hoffmannii Jensen & Asay) were established under a line-source irrigation system to evaluate the effect of five water levels and three harvest dates on concentrations of CP and NDF, and values of IVTD. With CP concentration of herbage, there were positive linear significant relationships with decreasing water levels for all species. Rankings for mean CP concentrations across water levels and harvest dates were smooth bromegrass > RS wheatgrass > hybrid-bromegrass > creeping foxtail > prairiegrass. No consistent relationships with IVTD across water levels were detected among the species. Averaged across water levels, harvest dates and years, smooth bromegrass, hybrid-bromegrass and creeping foxtail had significantly higher IVTD values than RS wheatgrass and prairiegrass. Rankings of mean NDF concentrations across water levels and harvest dates combined over years were prairiegrass > RS wheatgrass > hybrid-bromegrass > creeping foxtail > smooth bromegrass. Herbage of smooth bromegrass had higher IVTD values and lower NDF concentrations than hybrid-bromegrass, prairiegrass, creeping foxtail and RS-hybrid at all water levels.
- 出版日期2010-3
