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What are the effects of chlormequat and trinexapac-ethyl alone or in combination on lodging, height and yield of winter wheat in Tasmania?


Merry, AM and Dean, G and Botwright Acuna, T, What are the effects of chlormequat and trinexapac-ethyl alone or in combination on lodging, height and yield of winter wheat in Tasmania?, Proceedings of the 17th Australian Society of Agronomy Conference, 20-24 September 2015, Hobart, Australia, pp. 1-4. (2015) [Refereed Conference Paper]


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In the High Rainfall Zone (HRZ) irrigation and high rates of applied nitrogen fertiliser may increase the risk of lodging in winter wheat. Crop lodging can limit crop productivity through interfering with water and assimilate supply to the developing grain. Lodging can also interfere with harvest ranging from slowing harvest operation through to total crop loss when lodging is severe. Plant growth regulators (PGRs) mimic or alter production of plant hormones and thus regulate plant growth and development and are used as an insurance measure against lodging. In some instances, PGRs have been reported to increase yield irrespective of whether lodging has occurred. Experiments were conducted on winter wheat cvs. Brennan and Revenue over four seasons (2009-2012) in northern Tasmania. Crops were treated with varying rates, combinations and timings of chlormequat (CCC) and trinexapac-ethyl (TE). Experiments evaluated the individual and combined effects of these two PGRs on height and grain yield. PGRs treatments reduced height in most years, for example in 2012 the combined treatment of CCC and TE applied at early stem elongation had the greatest height reduction, decreasing plant height by 17% compared with the control. No lodging occurred in any year. PGRs increased yield in some years, for instance in 2012, CCC applied at mid tillering and early stem elongation increased yield by 7.5 and 4.1% respectively compared with the control. The results indicate that both TE and CCC alone and in combination can decrease lodging risk and in some seasons PGRs may increase yield.

Item Details

Item Type:Refereed Conference Paper
Keywords:plant growth regulators, cereals, yield components
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Agronomy
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Wheat
UTAS Author:Merry, AM (Dr Angela Merry)
UTAS Author:Dean, G (Mr Geoffrey Dean)
UTAS Author:Botwright Acuna, T (Professor Tina Acuna)
ID Code:103201
Year Published:2015
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-09-25
Last Modified:2018-04-05
Downloads:119 View Download Statistics

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