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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Commodity Protection and Quality Research » Research » Publications at this Location » Publication #269272

Title: The science behind the proposed maturity standard change

item ARPAIA, MARY LU - Kearney Agricultural Center
item COLLIN, SUE - Kearney Agricultural Center
item Fjeld, Kent
item SIEVERT, JIM - Kearney Agricultural Center
item Obenland, David - Dave

Submitted to: Citrograph
Publication Type: Trade Journal
Publication Acceptance Date: 6/10/2011
Publication Date: 6/15/2011
Citation: Arpaia, M., Collin, S., Fjeld, K.A., Sievert, J., Obenland, D.M. 2011. The science behind the proposed maturity standard change. Citrograph. 2(3):24-33.

Interpretive Summary:

Technical Abstract: The current maturity standard for navel oranges in California has been in place for nearly 100 years yet does not always do a good job of ensuring that consumers obtain good-tasting fruit during the early season. Early work that was performed which supported adoption of the standard may have been adequate for that time, but the marketplace is much more competitive now given the large number of commodities that consumers now have to choose from. Our research with the taste panel at UCKAC clearly demonstrated over a three-year period that navel oranges picked at a 8:1 SSC/TA ratio are disliked. This conclusion was supported by consumer testing performed near Chicago with the Tragon Corporation. All of this work also demonstrated that a new measure, which is calculated by subtracting TA times a set value from SSC, is superior to SSC/TA as a predictor of likeability. This new measure, which was designed to eliminate poor tasting fruit and at the same time not to overly delay harvest, has been named the California Standard and is designated as a possible replacement for our current maturity standard.