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Effects of temperature and osmotic stress on leaf appearance rate


Rawnsley, RP and Snare, TA and Lee, G and Lane, PA and Turner, LR, Effects of temperature and osmotic stress on leaf appearance rate, Proceedings of the 4th Australasian Dairy Science Symposium, 31 August - 2 September 2010, Lincoln, New Zealand, pp. 345-350. ISBN 9780864762306 (2010) [Refereed Conference Paper]

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Plant leaf regrowth stage is widely accepted as the key determinant for grazing interval, however regular monitoring and assessment of leaf appearance rate on farm is often neglected due to time and ambiguity in assessment. Ambient temperature and soil moisture availability are two of the principle factors determining the production and morphology of temperate pasture species. A controlled glasshouse study in which differing moisture stress treatments were applied at different ambient temperatures via a hydroponic culture system, showed that leaf appearance rate of perennial ryegrass (Lolium perenne L.), cocksfoot (Dactylis glomerata L.) and tall fescue (Festuca arundinacea Schreb.) can be successfully estimated using a linear regression model. The model produced from the glasshouse study was evaluated and further developed using historical leaf appearance rate data collated on farm over three years. A simple decision support tool was subsequently developed to quantify the expected leaf appearance rate of these species over the range of ambient temperature and soil moistures that are experienced in the temperate environment.

Item Details

Item Type:Refereed Conference Paper
Keywords:leaf stage; leaf appearance rate; moisture availability; pasture; ambient temperature.
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Crop and pasture production not elsewhere classified
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, browse and fodder crops
Objective Field:Sown pastures (excl. lucerne)
UTAS Author:Rawnsley, RP (Dr Richard Rawnsley)
UTAS Author:Snare, TA (Mr Thomas Snare)
UTAS Author:Lee, G (Dr Greg Lee)
UTAS Author:Lane, PA (Associate Professor Peter Lane)
UTAS Author:Turner, LR (Dr Lydia Turner)
ID Code:63495
Year Published:2010
Deposited By:Agricultural Science
Deposited On:2010-05-10
Last Modified:2012-03-20

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