Dylan Bruce1, Kenton Porker2, Sarah Noack3, James Hunt4, Bonnie Flohr5
1South Australian Research and Development Institute, 70 Farrell Flat Rd, Clare, SA, 5453, 2South Australian Research and Development Institute, Hartley Grove Urrbrae, SA, 5064, 3Hart Field-Site Group, 155 Main North Rd Clare, SA, 5453, 4Department of Plant, Animal and Soil Sciences, AgriBio Centre for AgriBiosciences, 5 Ring Rd La Trobe University,Bundoora, VIC, 3086
5CSIRO Agriculture and Food, Waite Rd Urrbrae, SA, 5064
Flowering time is a key determinant of wheat grain yield. As farm size increases, slow developing wheat cultivars enable growers to start sowing earlier, resulting in a greater proportion of the total sown area to flower during the optimal period. In 2017 an experiment consisting of nine cultivars and four times of sowing was established in Hart, South Australia, to assess the development and yield of newly released and unreleased winter and spring wheat cultivars. Due to its superior yield and stable flowering date, the long season winter cultivar Illabo was most adapted to the growing conditions at Hart from wide sowing windows (four weeks). All winter cultivars had stable flowering times (flowered within a 23 day period across all times of sowing), except for DS Bennett which flowered after the optimum period from early May sowing. While spring wheats sown at the optimal time were high yielding, yield and flowering dates were unstable over wide sowing windows with flowering dates spanning one month. The slow maturing spring cultivar LPB14-0392 also yielded well at Hart, although it does possess a unique development and flowering pattern that requires further investigation.