Assessment of canopy growth and development for three wheat cultivars under different water and nitrogen regimes
2017
Traits related to water productivity in dryland cropping interact in multiple ways to influence final grain
yield. Crop modelling can be a useful tool to address the challenge of determining how to best combine
region-specific traits and develop management adaptation for specific cultivars. The Agricultural Production
Systems sIMulator (APSIM) model has been developed and widely-used for diverse applications in scientific
research and decision support. However, the model requires further development to accurately simulate
important candidate traits associated with water productivity. To better capture differences among genotypes,
APSIM needs improvement related to the modelling of canopy development as a driver of water use. Field
experiments were conducted in 2015 to assess variation and covariation in traits related to water
productivity, e.g. early vigour, tillering, leaf area development, water soluble carbohydrate (WSC)
accumulation and transpiration efficiency. Contrasting genotypes for these traits were grown under a range
of water and nitrogen regimes. Data were collected through field observation, destructive sampling and highthroughput
technologies. Extensive phenotyping was used to explore patterns in canopy development and
canopy structure and their impact on productivity, with particular focus on variation occurring during the
vegetative stage. An improved wheat model is being developed using the Plant Model Framework in the next
generation prototype of APSIM. Experiments described above, as well as previously collected datasets, are
being used to develop new algorithms. The new model will be used to assess wheat traits related to water
productivity across the Australian wheatbelt.
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