Evaluation of AquaCrop and WOFOST in simulating of corn yield under deficit irrigation

Subject Areas : agronomy

Aslan  Egdernezhad1 ¹ (1- Assistant Professor, Department of Water Sciences and Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Ali Reza  Masjedi 2 ² (3- َAssociate Professor, Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Ali Reza  Shokouhfar 3 ³ (3- Assistant Professor, Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Mojtaba  Alavifazel 4 ⁴ (4- Associated Professor, Department of Agronomy, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)

Received: 2018-02-04 Accepted : 2018-06-10 Published : 2018-08-23

Keywords: biomass, water use efficiency, corn yield, Crop Modeling,

Abstract :

This study was conducted to evaluate two crop growth models (AquaCrop and WOFOST) in simulating corn yield under different irrigation water (T1:50, T2:75, T3:100 and T4: 150 mm evaporation from pan A) using data collected from a research farm station in Ahwaz during one season crop. Results showed that the highest and the lowest different between collected and simulated yield values using AquaCrop were obtained in T3 (0.45 ton.ha-1) and T2 (0.10 ton.ha-1), respectively. Using WOFOST were obtained in T4 (0.15 ton.ha-1) and T1 (0.01 ton.ha-1), respectively. The lowest and the highest different for biomass values using AquaCrop were obtained in T4 (1.1 ton.ha-1) and T3 (2.03 ton.ha-1), respectively. Results for WOFOST were obtained in T2 (0.65 ton.ha-1) and T1 (1.95 ton.ha-1), respectively. RSME values for corn yield using AquaCrop and WOFOST were 0.16 and 0.15 ton.ha-1, respectively. RMSE values for corn biomass using AquaCrop and WOFOST were 0.92 and 0.88 ton.ha-1, respectively. Values for MBE using AquaCrop and WOFOST were 0.04 and -0.05 ton.ha-1 for corn yield, respectively, and -0.52 and -0.47 ton.ha-1 for corn biomass, respectively. In general, WOFOST had a better accuracy to simulate corn yield.