บทคัดย่องานวิจัย

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A postharvest study of organically and conventionally grown apples.

DeEll, Jennifer R.,

Thesis of M.Sc., Dalhousie University, Canada, 1991, 186 pages

1991

บทคัดย่อ

A POSTHARVEST STUDY OF ORGANICALLY AND CONVENTIONALLY GROWN APPLES.

Organic apples are produced without synthetic pesticides, herbicides or mineral fertilizers.  This report describes a two year study (1989 & 1990) on the postharvest behaviour of organically grown apples.  McIntosh or Cortland apples were harvested from seven adjacent orchards (paired organic and conventional) located in the Annapolis Valley, N.S.  Samples were stored at 3circC, in ambient air or a controlled atmosphere of 2.5% oxygen and 4.5% carbon dioxide.  At harvest and/or after storage apples were evaluated for maturity, quality, sensory properties, mineral content, storage disorders and disease.  Organic apples were slightly less mature at harvest than conventional apples, were firmer and had higher % soluble solids.  After storage, organic apples tasted sweeter and more tart than conventional apples.  Compared to conventional apples, more organic apples were unmarketable due to higher incidence of apple scab, unidentified storage rots, sooty blotch, russet and defects.  Conventional appl

 es had a higher incidence of flyspeck than organic apples.  Mineral analyses indicated higher K and P and lower N concentrations in organic apples compared to conventional apples.  (Abstract shortened by UMI.).