Journal
CANADIAN JOURNAL OF PLANT SCIENCE
Volume 94, Issue 2, Pages 361-369Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.4141/CJPS2013-241
Keywords
Absorbance difference index/coefficient (I-AD); apples (Malus x domestica Borkh.); disorders; maturity; quality; storage
Categories
Funding
- Nova Scotia Fruit Growers' Association
- Scotian Gold Co-operative Limited
- Apple Growers' of New Brunswick
- PEI Apple Growers
- National Research Council's Industrial Research Assistance Program
- Agriculture and Agri-Food Canada's Canadian Agricultural Adaptation Program
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In this study, a new chlorophyll measurement tool [the delta absorbance (DA) meter] was used to develop an optimal harvest maturity model for Honeycrisp (TM) fruit. Apples from nine commercial orchards in the Annapolis Valley, Nova Scotia, Canada, were sampled over 11 consecutive weekly harvests during the 2010, 2011 and 2012 growing seasons. At each harvest, a sample of fruit was measured for its DA (I-AD) values, firmness, titratable acidity (TA),% soluble solids content (SSC), red skin coloration and internal core ethylene. Following approximately 3 mo of storage at 3.5 degrees C, samples were removed and assessed for disorder incidence. The optimal harvest period was identified by aligning all at harvest I-AD values, fruit quality measurements and post-storage disorder data with the corresponding harvest week. Then, the I-AD values associated with the harvests having high commercial fruit quality and the least collective expression of disorders, delineated the optimal harvest boundaries. As I-AD units declined during fruit maturity, the upper boundary value of 0.59 was deemed when to begin harvest, while the lower boundary value of 0.36 was deemed when to end harvest for long-term storage. The use of the DA model approach for optimal harvest delineation is potentially applicable to all commercial apple cultivars, but should be developed for each within a distinct growing region.
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