Apsim next generation wheat
Wheat yield is often limited by insufficient rainfall around anthesis with a terminal drought during grain-filling ( Richards, 1991). In these regions, rainfall is winter dominant ( Rebetzke and Richards, 1999 Richards and Lukacs, 2002 Rebetzke et al., 2007) and coincides with early wheat growth (planted in mid-autumn to early winter). the amount of leaf area produced early in the season) has been considered an important trait for rainfed (water-limited) wheat especially in Mediterranean climate regions such as southern Australia. Soil PAWC could play a significant role in delivering the benefit of early vigour and would require particular attention.ĪPSIM next generation, environment, establishment, genotype, management, Triticum aestivum IntroductionĮarly vigour or seedling vigour (i.e. Opportunities exists for development of early vigour wheat varieties for wetter sites.
Apsim next generation wheat plus#
Increase in yield was mainly from increase in biomass and grain number, and was reduced at sites with seasonal rainfall plus initial soil water <300 mm. Early vigour through selection of doubled early leaf sizes could increase yield by 16%. On a typical soil with plant available water capacity (PAWC) of 147 mm, simulated yield increase with early vigour associated with larger seed size was on average 4% higher compared with normal vigour wheat. Here, we present a modelling framework for simulating the impact of early vigour on wheat growth and yield at eight sites representing the major climate types in Australia. Whether early vigour can lead to improved water use efficiency and crop yields is strongly dependent on climate and management conditions across the entire growing season.
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However, early vigour is a genetically complex trait, and results from field experiments have been highly variable.
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Early vigour, or faster early leaf area development, has been considered an important trait for rainfed wheat in dryland regions such as Australia.