TESTING THE PERFORMANCE OF AQUACROP MODEL FOR SUNFLOWER PRODUCTION IN THE MIDDLE OF IRAQ

Eman H.Sheet; Entesar M.Gazal; Maan H. Sheet

doi:10.26682/avuod.2019.22.1.6

Eman H.Sheet university of duhok
Entesar M.Gazal Dept. of Dams & Water Resources, College of Engineering, University of Mosul-Iraq
Maan H. Sheet College of Agriculture, University of Duhok, Kurdistan Region-Iraq

DOI: https://doi.org/10.26682/avuod.2019.22.1.6

Keywords: AquaCrop, production function, sunflower yield

Abstract

AquaCrop is a reliable model for estimating crop productivity under rainfed or irrigation to improve water use efficiency in agriculture. The performance of AquaCrop was tested for sunflower. Field experiments were conducted during the seasons 2009 & 2010 at experimental farm, College of agriculture, Abu Ghraib, Baghdad, Iraq. Yield and biomass were measured under different irrigation treatments and two row spacing 20 and 30 cm. Input data and comparisons between simulated and observed yield production was done under different irrigation management conditions and row spacing. The model is calibrated with experimental using the data set for the season 2009 getting a good yield agreement of R²=0.95 with RMSE=0.21 for 20cm spacing and R²=0.93 with RMSE=0.4 for 30 cm spacing. The calibrated model is validated using the data set for the season 2010, the agreement of R² equal to 0.88 with RMSE= 0.41 for 20 cm spacing and R²=0.93 with RMSE=0.43 yield for 30 cm spacing. The model is validated also for another place near Baghdad (Ishaqi) using experimental data for the season 2005, was obtained a good agreement of R²=0.94 between simulated and observed yield. A crop production functions were predicted for sunflower with R²=0.95 for yield and 0.96 for biomass which could be a valuable term in irrigation management and decision making models.

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