Parameterization and Evaluation of a Simple Simulation Model (SSM-iCrop2) for Potato ( Solanum tuberosum L.) Growth and
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Parameterization and Evaluation of a Simple Simulation Model (SSM-iCrop2) for Potato (Solanum tuberosum L.) Growth and Yield in Iran Amir Dadrasi 1 & Benjamin Torabi 2 & Asghar Rahimi 1 & Afshin Soltani 2 & Ebrahim Zeinali 2 Received: 27 November 2019 / Accepted: 20 February 2020/ # European Association for Potato Research 2020
Abstract 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 Highlights The significance of the paper to the readers of the Potato Research is: 1. Two maturity groups were determined with thermal units of 1100 and 1500°C day-1 in the important potatoproducing provinces. 2. The evaluation results indicated that r, RMSE and CV for simulated tuber yield versus observed tuber yield were 0.80, 543 g m−2 and 14%, respectively 3. The SSM model can be proposed to estimate potential tuber yield, yield gap and the effects of climate change.
* Benjamin Torabi [email protected] Extended author information available on the last page of the article
Potato Research
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. Keywords Thermal unit . Water requirement . Tuber yield . SSM-iCrop2 model
Introduction Iran is the 12th potato producer in the world, and after China, India and Bangladesh is the fourth-biggest potato producer in Asia. Iranian farmers produced 4.95 million tonnes of potato in 2014, with an average yield of 31 t per hectare (FAOSTAT 2017). Currently, potato production in Iran cannot meet the domesti
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