In the current version 7.7 there is no parameter for transpiration efficiency and the critical leaf N concentration for CO2 concentration above 350 ppm.
Here is what I have from Peter Carberry, formerly with the APSIM group, and now with ICRISAT: "I am unsure on the state of the soybean module in APSIM. Assuming it is built from the crop template then it will accommodate full response to CC. The best person to answer this question on APSIM is Peter Thorburn ([email protected])."
Hope this helps!
Bill
Thank you for the help. Looking for the wheat documentation, the crop model use a factor to adjust RUE following a exponential curve in function of temperature and CO2 concentration, which is defined to the C3 crops (I did the simulation to confirm). Transpiration efficiency and the critical leaf N concentration can be find research for soybean that measured these changes. The following paper is about how they parameterized the model for wheat.
Reyenga, P. J., Howden, S. M., Meinke, H., McKeon, G. M., 1999. Modelling global change impacts on wheat cropping in south-east queensland, australia. Environmental Modelling & Software 14 (4), 297–306.
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