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Validation of APSIM for long duration rice varieties in different agro-climatic zones of Sri Lanka

conference contribution
posted on 2023-05-23, 11:01 authored by Fernando, MEKK, Amerasekara, DABN, Amarasingha, RK, Suriyagoda, LDB, Marambe, B, Galagedara, LW, Silva, GLLP, Punyawardena, R, David ParsonsDavid Parsons, Holger MeinkeHolger Meinke
Rice (Oryza sativa L.) is the staple food for many Asians. In Sri Lanka, rice production is heavily dependent on the rainfall distribution pattern, and would be adversely affected by climate change. Prediction and estimation of yield and resource-use efficiency of commonly grown rice varieties is of immense importance under a variable and changing climate. Agricultural system simulation models are useful tools to assess the performance of agricultural systems under scenarios of changing rainfall patterns. The present study was conducted to validate the Oryza module of the Agricultural Production Systems Simulator (APSIM) model for two long duration rice varieties, Bg403 and Bg379-2 (4 months maturity). Model evaluation was done using secondary data. APSIM simulated the observed rice yields for Bg403 and Bg379-2 with a strong fit (R2 of 0.88 and 0.77, respectively, and CV of 9.9% and 14.4%, respectively). Yield was less when grown under rainfed condition than under irrigation for both the varieties. The highest simulated yield loss was observed at Aralaganwila (Dry-Zone Low Country), where a 10% reduction in the seasonal rainfall was simulated. The validated APSIM-Oryza module can be used in evaluating the potential areas for rice cultivation in Sri Lanka under current and predicted climate change scenarios.


Publication title

Proceedings of the 17th Australian Society of Agronomy Conference


T Acuna, M Harrison, C Moeller, D Parsons




Tasmanian Institute of Agriculture (TIA)


Australian Society of Agronomy

Place of publication


Event title

17th Australian Society of Agronomy Conference

Event Venue

Hobart, Australia

Date of Event (Start Date)


Date of Event (End Date)


Rights statement

Copyright 2015 Australian Society of Agronomy Inc.

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  • Restricted

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