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.
|Title of host publication||16th AAC|
|Subtitle of host publication||Capturing opportunities and overcoming obstacles in Australian agronomy|
|Place of Publication||Australia|
|Number of pages||4|
|Publication status||Published - 2012|
|Event||16th Australian Agronomy Conference - University of New England, Armidale, Australia|
Duration: 14 Oct 2012 → 18 Oct 2012
Conference number: 16th
http://agronomyaustraliaproceedings.org/index.php/2012-conf-proc-homepage (Conference proceedings 2012 homepage)
|Conference||16th Australian Agronomy Conference|
|Abbreviated title||Capturing Opportunities and Overcoming Obstacles in Australian Agronomy|
|Period||14/10/12 → 18/10/12|
Bennett, J., Virgona, J., Martin, P., & O'Connell, P. (2012). Effects of plant growth regulators that reduce stem height on yield of wheat in southern Australia. In I. Yunusa (Ed.), 16th AAC: Capturing opportunities and overcoming obstacles in Australian agronomy (pp. 1-4). Regional Institute.