Evaluation of DSSATv4.7 Model in Simulation of Phenological Stages and Wheat Yield of Anfarm 4 under Different Irrigation Levels

Crop growth simulation models are one of the most advanced tools used today to estimate yield and optimize crop yields. Therefore, this study aimed to evaluate the ability of DSSAT-CERES-Wheat version 4.7 plant model to simulate the phenological stages and wheat yield of Anfaram 4 for Birjand weather conditions. For this purpose, a randomized complete block design with 3 replications was conducted at research field of agriculture, University of Birjand in 2016-2017. The treatments consisted of different levels of irrigation I1, I2, I3 and I4, respectively 125, 100, 75 and 50% of plant water requirement and I5 including rain fed with one supplementary irrigation. The results showed that the values of wheat genetic coefficients including P1V, P1D, P5, G1, G2, G3 and PHINT at model calibration stage were 25, 0, 17, 20.5, 30.16, 1.982 and 30, respectively. At the validation stage, the lowest and highest NRMSE values were observed in the estimation of pollination date (5.75%) and dry matter (18.37%), respectively. Therefore, it can conclude that DSSAT model simulated the phenological stages and yield of wheat for Birjand region.