Effects of plant growth regulators that reduce stem height on yield of wheat in southern Australia

Jaron Bennett, James Virgona, Peter Martin, P O'Connell

Research output: Book chapter/Published conference paperConference paperpeer-review

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The experiments reported here were designed to investigate the potential of the plant growth regulators (PGRs) Moddus and Cycocel, to increase yields in dryland wheat production systems of the southern Australian wheat belt. Experiments were conducted on wheat crops at Wagga in southern NSW (cultivar: EGA Gregory) and Swan Hill in Victoria (cultivar: Yitpi) in 2010. Crops were sprayed with varying rates and combinations of Moddus and/or Cycocel applied at three different crop growth stages, Z14, Z25 and Z31/32. Measurements included crop height, canopy greenness, lodging, stem non-structural carbohydrates (NSC), dry matter production, yield and yield components.The application of the PGRs was found to significantly decrease the height of treated plants, especially when applied from the beginning of stem elongation Z25 through to Z31/32. There were inconsistent effects of applying PGRs on yield. Combining the analysis of yields of the two sites revealed that yields increased by up to 0.4 t/ha when high rates (600 ml/ha) of Moddus were applied. Significant increases in yield at both sites were associated with increased ear bearing tillers and increased grain density. The results are discussed with respect to the prevailing seasonal conditions and the need for further broad-scale field testing.
Original languageEnglish
Title of host publication16th AAC
Subtitle of host publicationCapturing opportunities and overcoming obstacles in Australian agronomy
EditorsI. Yunusa
Place of PublicationAustralia
PublisherRegional Institute
Number of pages4
Publication statusPublished - 2012
Event16th Australian Agronomy Conference - University of New England, Armidale, Australia
Duration: 14 Oct 201218 Oct 2012
Conference number: 16th
http://agronomyaustraliaproceedings.org/index.php/2012-conf-proc-homepage (Conference proceedings 2012 homepage)

Publication series

ISSN (Print)0815-3779


Conference16th Australian Agronomy Conference
Abbreviated titleCapturing Opportunities and Overcoming Obstacles in Australian Agronomy
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