UQ00064 - StressMaster: A decision support tool to manage irrigation in real time in managed environments
Genotype-environment interactions impede wheat improvement to drought adaptation. Variability in rainfall and soil moisture leads to numerous drought patterns which all impact yields differently. By targeting representative drought patterns, scientists can identify key germplasm, traits and genes for better adaptation to their regions. A web-application, StressMaster, has been developed to assess irrigation options in order to target relevant drought patterns. The tool enables adapted management as the season advances. Applied to the Managed Environment Facilities (MEF), StressMaster has helped better manage MEF trials and target key material adapted to Australian environments.
The StressMaster application has been efficiently designed and implemented for usage at the MEF.
It has been successfully used to assist irrigation scheduling of two water treatments at each MEF site, each year. Over the duration of the project, all four 'typical' drought patterns occurring in the wheatbelt have been mimicked several times at the MEF.
StressMaster has also allowed the characterisation of each trial in terms of temperature, evaporative demand, radiation and rainfall. Those environmental variables, together with the drought and nitrogen (N) patterns reported by StressMaster, have been made available to MEF researchers from other projects to improve the understanding of trait adaptation.
In summary, StressMaster allows better trial management, thus speeding up the research process as the data collected are more relevant. It also allows better characterisation of the trial environments and thus adds value to the trial results, during the data analysis process. Overall, StressMaster gives greater impact for the dollars invested.
Make the StressMaster application available to other researchers (outside of MEF projects) and organise training sessions.
Encourage multi-disciplinary projects involving good trial management, phenotyping, environmental characterisation, physiology and genetic studies.
Couple environmental characterisation and statistical analysis for better returns on research investment.
Use environmental characterisation for other trials, such as the National Variety Trials (NVT).
Accurate phenotyping and screening in representative, managed environments increases the return from investment in pre-breeding programs and can lead more rapidly to higher yielding varieties in rain-fed crops. MEF users have been using and can keep using the application developed in this project to screen germplasm under water stress conditions (controlled irrigation) that mirror target production environments. Such management of the environment will lead in the medium term to greater progress in discovery and assessment of major traits, genes and germplasm relevant to adaptation to water limited environments.
The StressMaster application has been designed, implemented and is available on the web at http://cropdesign.net/stressmaster
StressMaster allows users to simulate the drought pattern that wheat crops have experienced in the Australian MEFs. Simulations use local weather data up to the current date and predict the likely future drought pattern for the remainder of the season based on long term historic climatic records (with an option to limit records to the same Southern Oscillation Index (SOI) phase when appropriate). Different irrigation scenarios can be tested to predict their influence on future drought events, assisting researchers to obtain desired type(s) of environments that are representative across the wheatbelt.
StressMaster also allows users to monitor the N status of the crop over the season. Hence the application also assists in decision making for fertilisation levels.
StressMaster has been used to define irrigation regimes at the MEF sites of Narrabri, Yanco and Narrabri, in 2013, 2014 and 2015. The project has increased the relevance of the phenotyping of wheat lines (benchmarking germplasm and diverse populations varying for potential adaptive traits) by allowing crops to be grown in more representative environments.
New features have been added to StressMaster at the end of the project to characterise a suite of environmental variables and estimate stress indices relative to heat, frost, drought and N limitation.
The environment of the different trials from 2012 to 2015 has been characterised in detail and the results have been made available to other MEF projects. Those results add value to the data analysis process, as they allow a better understanding of the value of traits in diverse environments.
Overall, the project has been used to add value to other MEF projects by increasing the representative value of the environments tested, and by delivering detailed information relative to key environmental indices affecting physiological traits and yields.
- There is an opportunity to extend StressMaster to be usable for other sites. Other GRDC projects could thus benefit from the application. Such extension would require development of a customer based module to enable users to enter specific soil characteristics and/or choose a soil relevant to their paddock in a soil database.
- The outputs of the StressMaster application could be systematically combined with statistical analyses to add value to research project outputs.
- There is also an opportunity to combine modelling with the phenotyping that is carried out at the MEF to develop new methodologies to better understand how wheat traits impact yields in different drought environments.
- The StressMaster application could be extended to other crops.
1. List of scientific and technical communications.
2. StressMaster report.
3. Project summary.
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