Appropriate existing field experiments previously established through other GRDC investment should be utilised, but new field experimental sites are to be instigated in 2023 where required. Irrigation treatments to simulate a range of seasonal rainfall deciles are anticipated at one key site per region. NITROGEN VOLATILIZATION LOSSES USING APSIM TRIALApplicants should assume 12 core trial sites, four in each GRDC region. However, treatments of regional significance may also be investigated. Through pre-experimental modelling and active collaboration between crop and soil experimentalists and systems analysts, the number and location of core experimental sites required to deliver the output will be determined, and a standardised set of treatments and measurements will be deployed across regions for a national, cross-site analysis. Outcomeīy 1 April 2026, a comprehensive and accurate national data set of N balance, cycling and loss pathways to address key gaps in knowledge and improve capabilities for soil N simulation in cropping systems.ĭescription: Commencing on limited scale in 2022, soil, plant and agronomic data will be collected over at least three seasons at trial sites representing the dominant farming systems and soil types in each of the northern (winter and summer crops), southern and western regions. Consequently, the new data produced by this investment and other published data will be used to enhance and augment the relevant N routines in the APSIM NextGen crop and soil model which will then predict N losses and environmental impacts for grain production across Australia.Ī summary of the improved APSIM simulations, along with case studies, and implications for environmental impacts will be communicated to the grains industry, marketers, policy makers and researchers via a technical report, scientific papers and other communication channels. Detailed measurements at the key locations and historical data sets will serve as case studies that bring credibility to N cycling and losses for the grains industry.Įxtending detailed N measurements from a limited number of sites to represent the national grains industry will require the use and improvement of crop and soil models. New field experimental sites are to be established where there is an absence of appropriate existing experiments previously established through other GRDC investment. For the purposes of the development of the tender application and budget, applicants should assume 12 core trial sites, four in each GRDC region, monitored for at least three winter, and where appropriate, three summer seasons. Pre-experimental modelling investigations in the first six months are needed to inform sites selection and the measurements required. Business development and commercialisationĪ comprehensive data set of nitrogen (N) balance and cycling with explicit measurement of loss pathways is required to address key gaps for the most important soil types and farming systems across Australia's grain growing areas.
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