Evaluation of AquaCrop for Simulation of Wheat Grain Yield and Water Use Efficiency under Different Irrigation Condition in Farm

Subject Areas :

Maryam Abedi ¹ (M.Sc. Student of Irrigation and drainage, Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Aslan Egdernezhad ² (Assistant Professor, Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Niazali Ebrahimipak ³ (Associated professor, Department of irrigation and soil physics, Soil and Water Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.)

Received: 2019-08-21 Accepted : 2020-02-28 Published : 2019-03-21

Keywords: Wheat, water use efficiency, model validation, AquaCrop,

Abstract :

Wheat is one of the most important crops in the world. So, use of crop models helps to have an acceptable estimation of its grain yield in different conditions. Regarding that, in order to evaluate AquaCrop, as one of the most useful crop model, under different irrigation water condition in farm, this research was conducted in Kosar irrigation network located at Khuzistan province. Regarding that, long term data in three farms were collected. Then, 70 percent of data were used for calibration. AquaCrop validation results showed that this model had low error and good efficiency. AquaCrop were evaluated using the remaining 30 percent of data. Results showed that the difference between observed and simulated results for wheat grain yield and water use efficiency were 0.45 ton.ha-1 and 0.05 kg.m-3, respectively. In addition, MBE, RMSE and NRMSE results for wheat grain yield were 0.14 ton.ha-1, 0.52 ton.ha-1 and 0.13, respectively. Those results for water use efficiency were 0.01 kg.m-3, 0.06 kg.m-3 and 0.10, respectively. EF and d values for wheat grain yield 0.3 and 0.99, respectively, and those values for water use efficiency were 0.1 and 0.99, respectively. So, AquaCrop accuracy was acceptable for simulation of both parameters and it is recommended to use this model for simulation of mentioned parameters.