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Research article - Peer-reviewed, 2018

Improving the prediction of potato productivity: APSIM-Potato model parameterization and evaluation in Tasmania, Australia

Borus, Dinah; Parsons, David; Boersma, Mark; Brown, Hamish; Mohammed, Caroline;

Abstract

Crop growth models are required to be extensively evaluated against actual data from field grown plants in order to have confidence in their prediction of crop productivity under various management options or a future changed climate. We evaluated the ability of the APSIM-potato model to predict production, phenology, and N-uptake of potato (Solanum tuberosum L.) under Tasmanian conditions. On-farm monitoring plots were established in north-west Tasmania within four different well–managed potato fields grown during the 2012/13 cropping season. Detailed soil and crop data sets measured in the on-farm plots planted with two potato cultivars, ‘Russet Burbank’ and ‘Moonlight’ were used to parameterise and evaluate the model. The model realistically reproduced the observed tuber yield with high precision (a mean N-RMSE of 15.4% and modelling efficiency of 1.0 for both cultivars). Measured mean dry matter (TDM) tuber yield was 17 t ha-1 for ‘Russet Burbank’ with a simulated yield of 20 t ha-1 . For ‘Moonlight’ simulated TDM yield was 16.0 t ha-1 compared to measured yield of 15.1 t ha-1 . The simulation results provide insight on the model performance under Tasmanian conditions. The results suggest that the model has potential to be used for purposes such as simulating productivity under various management options and climate change impact studies. Additional experiments are however required to improve cultivar specific input parameters such as phenology, leaf area and leaf duration and other functions that needs further refinement to improve model ability to simulate plant organs beside the tuber.

Keywords

APSIM-potato model; climate change; evaluation; parameterisation; simulation; tuber dry matter yield

Published in

Australian Journal Of Crop Science

2018, volume: 12, number: 1, pages: 32-43

Authors' information

Borus, Dinah
University of Tasmania
University of Tasmania
Swedish University of Agricultural Sciences, Department of Agricultural Research for Northern Sweden
Boersma, Mark
University of Tasmania
Brown, Hamish
New Zealand Institute for Plant and Food Research
Mohammed, Caroline
University of Tasmania

UKÄ Subject classification

Horticulture
Agricultural Science

Publication Identifiers

DOI: https://doi.org/10.21475/ajcs.18.12.01.pne570

URI (permanent link to this page)

https://res.slu.se/id/publ/99965