Application of the FAO model Aquacrop for estimating crop yield under conditions of soil water deficit stress in the Cambodian lowlands

Soknith Chreok1, Chantha Oeurng1, Layheang Song1, Camilla Vote3, Ty Sok1, Vanndy Lim2, Vang Seng2, Philip Eberbach3, John Hornbuckle4

1 Institute of Technology of Cambodia, Department of Rural Engineering, Water Resource Engineering and Rural Infrastructure, Phnom Penh, Cambodia, 12156,, 
2 Cambodian Agricultural Research and Development Institute, Phnom Penh, Cambodia  
3 Charles Sturt University, Graham Centre for Agricultural Innovation, Wagga Wagga, NSW, Australia, 
4 Deakin University, Griffith, NSW Australia. 


The purpose of this study was to test the Aqua Crop model in simulate canopy cover and above ground biomass of maize under three soil water regimes in a semi-humid environment. The trial at the Cambodian Agricultural Research and Development Institute (CARDI), Cambodia, over the 2015-2016 growing season used 3 plots each with three water regimes. The comparison between the observations and simulated values using statistics indicators R2, RMSE, nRMSE, Nash, D, and MBE were 0.93, 10.9%, 46.6%, 0.36, 0.9, and 0.37t/ha for canopy cover (overestimation) and 0.97, 1.91 t/ha, 46.9%, 0.44, 0.89, and 0.43 t/ha (overestimation) for biomass respectively.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

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David Marland Photography Southern Farming Systems Agriculture Victoria

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