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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?
Citation
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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Copyright 2015 the author
Official URL: http://www.agronomyaustralia.org/
Abstract
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 and Veterinary Sciences |
| Research Group: | Crop and Pasture Production |
| Research Field: | Agronomy |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Winter Grains and Oilseeds |
| Objective Field: | Wheat |
| UTAS Author: | Merry, AM (Dr Angela Merry) |
| UTAS Author: | Dean, G (Mr Geoffrey Dean) |
| UTAS Author: | Botwright Acuna, T (Associate 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: | 90 View Download Statistics |
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