Charles Sturt University
Graham Centre for Agricultural Innovation

Irrigation water productivity modelling of crops

25 November 2016

Photo: Associate Professor Xiaojun Shen is using the APSIM-WHEAT model to simulate grain yield and water use efficiency of wheat under different irrigation treatments. Associate Professor Xiaojun Shen, a visiting scientist from the Farmland Irrigation Research Institute of the Chinese Academy of Agricultural Sciences, is working on the irrigation water productivity modelling of irrigated wheat with Drs Ketema Zeleke (CSU) and De Li Liu (NSW DPI). He is using the APSIM-WHEAT model to evaluate different irrigation scenarios, to determine which one results in the highest irrigation water use efficiency.

Associate Professor Shen has calibrated and validated the model using the above-ground biomass and grain yield from three seasons of field experiments. The validated model was used to simulate the grain yield, water use and irrigation water use efficiency of wheat under different irrigation treatments using daily meteorological data from 1960-2010.

The results show that irrigating only one time during turning green and joining stages of wheat can result in the highest yield and water use efficiency. However, two irrigation treatments, at reproductive and grain filling stages respectively, results in higher grain yield and slightly lower water use efficiency than one irrigation treatment. Dr Shen will use the APSIM-WHEAT model to simulate the grain yield and water use efficiency of wheat under future climate change scenarios.

Read the earlier article about Assoc Prof Xiaojun Shen’s 12 month visit to Australia at http://www.csu.edu.au/__data/assets/pdf_file/0003/2194626/Autumn-16-email.pdf