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Effect of defoliation management, based on leaf stage, on perennial ryegrass (Lolium perenne L.), prairie grass (Bromus willdenowii Kunth.) and cocksfoot (Dactylis glomerata L.) under dryland conditions: 1. Regrowth, tillering and water-soluble carbohydrate concentration

Citation

Turner, LR and Donaghy, DJ and Lane, PA and Rawnsley, RP, Effect of defoliation management, based on leaf stage, on perennial ryegrass (Lolium perenne L.), prairie grass (Bromus willdenowii Kunth.) and cocksfoot (Dactylis glomerata L.) under dryland conditions: 1. Regrowth, tillering and water-soluble carbohydrate concentration, Grass and Forage Science, 61, (2) pp. 164-174. ISSN 0142-5242 (2006) [Refereed Article]

Copyright Statement

Copyright 2006 Blackwell Publishing Ltd.

DOI: doi:10.1111/j.1365-2494.2006.00523.x

Abstract

A field study was undertaken between April 2003 and May 2004 in southern Tasmania, Australia to quantify and compare changes in herbage productivity and water-soluble carbohydrate (WSC) concentration of perennial ryegrass (Lolium perenne L.), prairie grass (Bromus willdenowii Kunth.) and cocksfoot (Dactylis glomerata L.) under a defoliation regime based on leaf regrowth stage. Defoliation interval was based on the time taken for two, three or four leaves per tiller to fully expand. Dry-matter (DM) production and botanical composition were measured at every defoliation event; plant density, DM production per tiller, tiller numbers per plant and WSC concentration were measured bimonthly; and tiller initiation and death rates were monitored every 3 weeks. Species and defoliation interval had a significant effect (P < 0.05) on seasonal DM production. Prairie grass produced significantly more (P < 0.001) DM than cocksfoot and ryegrass (5.7 vs. 4.1 and 4.3 t DM ha-1 respectively). Plants defoliated at the two-leaf stage of regrowth produced significantly less DM than plants defoliated at the three- and four-leaf stages, irrespective of species. Defoliation interval had no effect on plant persistence of any species during the first year of establishment, as measured by plant density and tiller number. However, more frequent defoliation was detrimental to the productivity of all species, most likely because of decreased WSC reserves. Results from this study confirmed that to maximize rates of regrowth, the recommended defoliation interval for prairie grass and cocksfoot is the four-leaf stage, and for perennial ryegrass between the two and three-leaf stages. © 2006 Blackwell Publishing Ltd.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Crop and Pasture Production
Research Field:Agronomy
Objective Division:Animal Production and Animal Primary Products
Objective Group:Pasture, Browse and Fodder Crops
Objective Field:Sown Pastures (excl. Lucerne)
Author:Turner, LR (Dr Lydia Turner)
Author:Donaghy, DJ (Associate Professor Danny Donaghy)
Author:Lane, PA (Associate Professor Peter Lane)
Author:Rawnsley, RP (Dr Richard Rawnsley)
ID Code:32807
Year Published:2006
Web of Science® Times Cited:40
Deposited By:Agricultural Science
Deposited On:2006-08-01
Last Modified:2013-12-13
Downloads:0

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