Welcome to APSIM

NEWS

SILO Redevelopment

Are you aware that the SILO climate database has been redeveloped. The new system is now available for use. Some benefits of the new system:
• all datasets are now free of charge (supported by the Queensland Government’s Open Data initiative)
• data can now be distributed as they are licensed under the Creative Commons Attribution 4.0 licence
• users can now download gridded data (data are in NetCDF format). Please see the new web site for more information about accessing the gridded data.
• the new web interface is much easier to use than the old interface
• the new Application Programming Interface (API) enables users to query the amount of observed data available at each station
• patched point datasets are available at nearly all (18,700) stations (previously patched datasets were only available at a modest subset of the stations)

The APSIM SILO mirror based out of Toowoomba will stop working soon. You will need to switch the new SILO climate database as soon as possible.

You can find the SILO Getting Started Guide in the Technical documentation section of http://www.apsim.info/Documentation.aspx

Monday, 25 June 2018/Author: Sarah Cleary/Number of views (36)/Comments (0)/
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4th Annual ISU APSIM Training Course

Iowa State University Department of Agronomy is hosting the 4th Annual ISU APSIM Training Course - Evaluating Production and Environmental Performance of Cropping Systems with APSIM. There are 34 participants from 12 U.S. states with interest in soils, crops, and atmospheric sciences. Look for updates on Twitter with #ISUAPSIM2018.  

Tuesday, 12 June 2018/Author: Sarah Cleary/Number of views (121)/Comments (0)/
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APSIM Training

September 18-19, Brisbane

The next APSIM training course will be held at the Queensland Bioscience Precinct, St Lucia on the 18th and 19th of September.  Please send your EOI and/or any questions to apsim@csiro.au
Tuesday, 12 June 2018/Author: Sarah Cleary/Number of views (105)/Comments (0)/
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Are you having problems with APSIM or have questions?

If you are using APSIM (version 7.x or APSIM Next Generation) and think you have found a software defect, you can submit a defect report here:

If you're not sure whether the behaviour you are seeing is a defect or not, you can talk to a developer or other users by posting on the support forum: http://www.apsim.info/Support.aspx. This forum can also be used for general questions about APSIM.

If you have questions relating to commercial access to APSIM or are interesting in attending APSIM training, then you can send an email to: apsim@csiro.au

Thursday, 26 April 2018/Author: Sarah Cleary/Number of views (223)/Comments (0)/
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APSIM Training

Expression of Interest Request

We are seeking Expression of Interests for the next APSIM training course to be run in August or September 2018.  If you are interested in attending, please send an email to apsim@csiro.au.  Please include you preferred location/s. 
Thursday, 26 April 2018/Author: Sarah Cleary/Number of views (281)/Comments (0)/
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FEATURES

Simulating carbon dioxide fertilisation in crops

Author: Chris Murphy/Wednesday, 29 March 2017/Categories: Features

To model crop growth under the higher atmospheric carbon dioxide concentrations that will occur in the future, there needs to be and accurate representation of the link between atmospheric carbon dioxide concentrations and growth.

A review of APSIM’s crop models showed that carbon dioxide fertilisation effects were well founded, tested and documented in a number of important (mainly C3 crops) crops, notably wheat. There was agreement that many of these well founded representations could be generalised to other crops with similar photosynthetic pathways (e.g. generalising the science in wheat to other C3 crops). The situation was less well substantiated in crops with the C4 photosynthetic pathway.

The overall conclusion is that for a range of important crops, the general situation of representing carbon dioxide fertilisation effects on photosynthesis and transpiration in APSIM was close to the ‘state of the art’ given current understanding of, and data on the processes involved, and the aims of the APSIM model. There is an immediate need for better documentation of the representation of carbon dioxide fertilisation in APSIM, and a strategic need for further research and model development in this area.

For further details see the new paper titled Responses to atmospheric CO2 concentrations in crop simulation models: a review of current simple and semicomplex representations and options for model development in Global Change Biology at the following link.

Recommendations relevant to the APSIM modelling community are:

1.That the current RUE, TE and CNC parameters for CO2 fertilization in wheat be implemented in all C3 plants, and parameters in maize be implemented in all C4 plants (unless the code based makes that really difficult).

2. That he current status of the representation, parameterisation and validation of CO2 fertilisation of plants in APSIM compiled by Vanuytrecht and Thorburn is made available here.

3. That plant models developed in the PMF be required to have CO2 fertilization included before being approved for inclusion in APSIM by the Reference Panel. 


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