Welcome to APSIM


University of Southern Queensland joins the APSIM initiative.

The APSIM initiative has been further strengthened with the University of Southern Queensland (USQ) recently joining the APSIM initiative (AI) as a member. 

USQ brings an extensive range of expertise to the AI collaboration including:

  • Cropping and grazing system
  • Climate Science
  • Bio-economics
  • Interface design
  • Data analytics
  • App and decision support tool design and development
  • Development of educational materials using APSIM

USQ has been an active user of APSIM in its research and educational activities and its membership reflects its dedication to the continued improvement of the model’s science and applications. 

For more details see https://www.usq.edu.au/news-events/news/2017/10/usq-joins-apsim
Thursday, 26 October 2017/Author: Dean Holzworth/Number of views (271)/Comments (0)/
Categories: News

APSIM Training, Brisbane, 11th and 12th October 2017

The next APSIM training course is scheduled for 11th and 12th October 2017 in Brisbane, Australia.

You can view the training program and registration form here.

Thursday, 3 August 2017/Author: Chris Murphy/Number of views (878)/Comments (0)/
Categories: News

Biochar model

Iowa State University (Archontoulis et al. 2016) have developed a biochar model for APSIM that integrates biochar knowledge and enables simulation of biochar effects within cropping systems.

This model has been released in APSIM  7.9 as an 'example'. It can be accessed by clicking 'New' from within the user interface and selecting the biochar folder. For more details see http://onlinelibrary.wiley.com/doi/10.1111/gcbb.12314/full

Wednesday, 17 May 2017/Author: Chris Murphy/Number of views (971)/Comments (0)/
Categories: News

APSIM 7.9 Release

APSIM version 7.9 has been released. You can download it from the registration page or view a list of the issues addressed here.
Wednesday, 3 May 2017/Author: Dean Holzworth/Number of views (1142)/Comments (0)/
Categories: News

APSIM Training, Brisbane, 11th and 12th October 2016

The APSIM training course originally planned for August in Brisbane, Australia has been rescheduled for 11th and 12th October 2016.

You can view the training program and registration form here.

Monday, 8 August 2016/Author: Chris Murphy/Number of views (2556)/Comments (0)/
Categories: News


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. 


Number of views (1167)/Comments (0)