Crop models can be used to estimate yield, water requirements and plant nutrition requirements under different conditions. This study examines the performance of the SSM-iCrop2 model in terms of predicting tuber yield, phenological stage and water requirement of potato (Solanum tuberosum L.) under changing climate circumstances in Iran. Simulation of potato growth, tuber yield and water requirement for cultivars commonly grown in Iran (Agria, Marfona, Sante and Arinda) was performed using the SSM-iCrop2 model. Data from different field experiments in major potato-producing provinces were used for parameterization and evaluation. The parameterization results of the SSM-iCrop2 model showed that two maturity groups (early and late maturity) were determined with thermal units of 1100 and 1500 °C day⁻¹, respectively, in the important potato-producing provinces. The model was evaluated based on independent experimental data which were not used for parameterization step. The observed tuber yield and water requirement ranged between 2013 and 5902 g m⁻² and 3523 and 8547 m³ ha⁻¹ with an average of 3542 g m⁻² and 6178 m³ ha⁻¹, respectively. The simulated tuber yield and water requirement varied in the range of 2489 to 5881 g m⁻² and 2200 to 7149 m³ ha⁻¹ with an average of 3607 g m⁻² and 5901 m³ ha⁻¹, respectively. Also, the evaluation results indicated that the correlation coefficient (r), root mean square error (RMSE) and coefficient of variation (CV) for the simulated versus observed tuber yield and water requirement were 0.80, 543 g m⁻² and 14% and 0.85, 944 m³ ha⁻¹ and 15%, respectively. Therefore, the model can be used to estimate potential tuber yield, yield gap and the effects of climate change.

作物模型可用于估计不同条件下的产量，水需求和植物营养需求。这项研究从预测块茎产量，物候期和在气候变化的伊朗环境下马铃薯（Solanum tuberosum L.）的需水量方面研究了SSM-iCrop2模型的性能。使用SSM-iCrop2模型模拟了伊朗（Agria，Marfona，Sante和Arinda）常用栽培品种的马铃薯生长，块茎产量和需水量。来自马铃薯主产省不同田间试验的数据用于参数化和评估。SSM-iCrop2模型的参数化结果表明，以1100和1500°C第^-1天的热量单位确定了两个成熟度组（早期和晚期成熟度）分别位于重要的马铃薯生产省份。基于未用于参数化步骤的独立实验数据评估模型。观察到的块茎产量和需水量在2013年和5902 g m ^-2之间以及3523和8547 m ³  ha ^-1之间，平均分别为3542 g m ^-2和6178 m ³  ha ^-1。模拟的块茎产量和需水量在2489至5881 g m ^-2和2200至7149 m ³  ha ^-1的范围内变化，平均为3607 g m ^-2和5901 m ³  ha ^-1， 分别。此外，评估结果表明，模拟和观察到的块茎产量和需水量的相关系数（r），均方根误差（RMSE）和变异系数（CV）分别为0.80、543 g m ^-2，14％和0.85分别为944 m ³  ha ^-1和15％。因此，该模型可用于估计潜在的块茎产量，产量缺口和气候变化的影响。