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RESEARCH ARTICLE (Open Access)

Evaluating the Agricultural Production Systems sIMulator (APSIM) wheat module for California

Nicholas Alexander George https://orcid.org/0000-0003-1687-7360 A B * , Helio de Jesus Pedro Cuamba B C , Mark E. Lundy A D and Sarita Jane Bennett https://orcid.org/0000-0001-8487-7560 B
+ Author Affiliations
- Author Affiliations

A Department of Plant Sciences, University of California, Davis, CA 95616, USA.

B School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia.

C Faculty of Agronomy and Forest Engineering, University of Eduardo Mondlane, P.O. Box 257, Maputo 3453, Mozambique.

D Division of Agriculture and Natural Resources, University of California, Davis, CA 95618, USA.

* Correspondence to: nicholas.george@curtin.edu.au

Handling Editor: Davide Cammarano

Crop & Pasture Science 75, CP23046 https://doi.org/10.1071/CP23046
Submitted: 26 July 2022  Accepted: 7 February 2024  Published: 29 February 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Computer-based crop simulation models are important tools for agricultural research and management. APSIM (Agricultural Production Systems sIMulator) is commonly used around the world but has not been widely validated in North America.

Aims

The objective of this work was to evaluate the reliability of APSIM for simulating wheat production in California, with the aim of providing guidance for future field research aimed at model calibration and validation.

Methods

Environmental and management data from state-wide wheat variety trials of common wheat (Triticum aestivum L.) were used to parameterise the APSIM-Wheat module (ver. 7.10 r4220). Simulated yield and protein data were compared with observed field trial results to test the reliability of APSIM simulations.

Key results

The most reliable simulation of grain yield had a root-mean-square error of 1040 kg/ha and normalised root-mean-square error of 16% relative to actual field data. Preliminary calibration of the model for Californian wheat varieties did not improve simulation accuracy or precision.

Conclusions

The accuracy or precision of the simulations was comparable to that of other tests of the APSIM-Wheat module in environments where it has not been previously calibrated but was considered too low to be reliable. The lack of reliability was due to the poor representation of local Californian wheat genotypes by existing APSIM cultivars, as well as possible lack of precision and accuracy of field data.

Implications

APSIM could be a valuable tool for wheat research and management in California; however, further research is needed to generate suitable field data for model calibration and validation.

Keywords: abiotic stress, agronomy, breeding, cereals, cropping systems, farming systems, mediterranean environments.

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