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Sensitivity Analysis of Plant- and Cultivar-Specific Parameters of APSIM-Sugar Model: Variation between Climates and Management Conditions

1
United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-0065, Japan
2
Faculty of Agriculture, Rajarata University of Sri Lanka, Puliyankulama, Anuradhapura 50000, Sri Lanka
3
Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan
4
Faculty of Agriculture, Kagoshima University, 1-21-24 Korimoto, Kagoshima-shi, Kagoshima 890-8580, Japan
*
Authors to whom correspondence should be addressed.
Agronomy 2019, 9(5), 242; https://doi.org/10.3390/agronomy9050242
Received: 18 April 2019 / Revised: 7 May 2019 / Accepted: 11 May 2019 / Published: 14 May 2019
With increasing demand for food and energy, there is a great need for improving sugarcane productivity. New cultivars and management strategies can be assessed using process-based crop models. Information on cultivars needs to be updated frequently, but it is still limited in most crop models. Therefore, it is important to identify possible candidates for varietal parameterization and calibration. Because sensitivity analysis is computationally expensive, we used a less expensive emulator-based approach to conduct a global sensitivity analysis using the apsimr package and GEM-SA software. We studied the sensitivity of four yield outputs of the APSIM-Sugar model to 13 parameters in rainfed and irrigated conditions in Japan and Sri Lanka. Unlike previous studies, our aim was to give comprehensive insights into the variation in sensitivity due to variation in climate. The results confirmed distinct variation of parameter influence between climates and between management conditions. We identify possible candidates for parameterization and calibration of new cultivars for APSIM-Sugar under different environments, and show the effect of variation in climate on variation in parameter influence under different management conditions. It was confirmed that both radiation use efficiency and transpiration efficiency were sensitive and have to be examined to use new cultivars, though these are not listed as cultivar parameters. View Full-Text
Keywords: GEM-SA; apsimr; cultivar parameters; sugarcane; radiation use efficiency; transpiration efficiency; Sri Lanka; Japan GEM-SA; apsimr; cultivar parameters; sugarcane; radiation use efficiency; transpiration efficiency; Sri Lanka; Japan
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MDPI and ACS Style

Gunarathna, M.H.J.P.; Sakai, K.; Nakandakari, T.; Momii, K.; Kumari, M.K.N. Sensitivity Analysis of Plant- and Cultivar-Specific Parameters of APSIM-Sugar Model: Variation between Climates and Management Conditions. Agronomy 2019, 9, 242. https://doi.org/10.3390/agronomy9050242

AMA Style

Gunarathna MHJP, Sakai K, Nakandakari T, Momii K, Kumari MKN. Sensitivity Analysis of Plant- and Cultivar-Specific Parameters of APSIM-Sugar Model: Variation between Climates and Management Conditions. Agronomy. 2019; 9(5):242. https://doi.org/10.3390/agronomy9050242

Chicago/Turabian Style

Gunarathna, M.H.J.P., Kazuhito Sakai, Tamotsu Nakandakari, Kazuro Momii, and M.K.N. Kumari 2019. "Sensitivity Analysis of Plant- and Cultivar-Specific Parameters of APSIM-Sugar Model: Variation between Climates and Management Conditions" Agronomy 9, no. 5: 242. https://doi.org/10.3390/agronomy9050242

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