Assessment of internal quality attributes of mandarin fruit. 2. NIR calibration model robustness
J. A. Guthrie A B C , D. J. Reid A and K. B. Walsh BA Delivery, Queensland Department of Primary Industries and Fisheries, PO Box 6014, CQ Mail Centre, Rockhampton, Qld 4702, Australia.
B Plant Sciences Group, Central Queensland University, Rockhampton, Qld 4702, Australia.
C Corresponding author. Email: john.guthrie@dpi.qld.gov.au
Australian Journal of Agricultural Research 56(4) 417-426 https://doi.org/10.1071/AR04299
Submitted: 2 December 2004 Accepted: 23 February 2005 Published: 26 April 2005
Abstract
The robustness of multivariate calibration models, based on near infrared spectroscopy, for the assessment of total soluble solids (TSS) and dry matter (DM) of intact mandarin fruit (Citrus reticulata cv. Imperial) was assessed. TSS calibration model performance was validated in terms of prediction of populations of fruit not in the original population (different harvest days from a single tree, different harvest localities, different harvest seasons). Of these, calibration performance was most affected by validation across seasons (signal to noise statistic on root mean squared error of prediction of 3.8, compared with 20 and 13 for locality and harvest day, respectively). Procedures for sample selection from the validation population for addition to the calibration population (‘model updating’) were considered for both TSS and DM models. Random selection from the validation group worked as well as more sophisticated selection procedures, with approximately 20 samples required. Models that were developed using samples at a range of temperatures were robust in validation for TSS and DM.
Additional keyword: non-invasive.
Acknowledgments
Funding support was received from Horticulture Australia (Citrus Marketing and Development Group) and Central Queensland University – Research Training Scheme. Fruit was supplied by Steve Benham of Joey Citrus, Munduberra, and by Jim and Deslea Yeldham, Citrus Farm, Dululu, Qld. This manuscript represents an extension of work reported at the 10th International Conference of Near Infrared Spectroscopy, Konju, Korea, June 2001.
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