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Quality changes of 'Lobo' apples during cold storage.

Dris, R.; Niskanen, R.;

Acta Horticulturae Year: 1999 Issue: No. 485 Pages: 125-131 Ref: 16 ref.

1999

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Quality changes of 'Lobo' apples during cold storage.

Apples (cv. Lobo) from two orchards (orchard 1, trees grafted on YP rootstock, and orchard 2, trees grafted on A2 rootstock) situated in the southwest of Finland were harvested either at the end of August (early harvest) or at the beginning of October (predicted optimal or normal harvest), and stored for 3 months at 3 deg C and 85% RH in unsealed paper bags or unsealed, unperforated polyethylene bags. Macronutrients (N, P, K, Ca and Mg) and dry matter in fruit flesh, fruit diameter and firmness as well as soluble solids content (SSC) in juice were determined before and after storage. Fruits from orchard 2 were smaller in diameter and their firmness per diameter was higher, whereas dry matter and SSC were lower than in fruits from orchard 1. At normal harvest time, macronutrient concentrations were higher in fruits from orchard 2, and at early harvest, N and K were higher in fruits from orchard 1 than from orchard 2. Fruit firmness per diameter, dry matter and SSC (orchard 1 only) were higher at

normal harvest than at early harvest. Firmness per diameter decreased and SSC in juice increased during storage of fruits harvested at the normal date. Low or even decreasing SSC of early harvested fruits during storage indicated improper ripening. Dry matter increased and fruit diameter decreased because of water loss and shrivelling of fruits during storage. The nutrient concentrations of fruits increased along with increasing dry matter content. In the early harvested fruits from orchard 1, physiological disorders [unspecified] increased significantly during storage. Normally harvested fruits stored in polyethylene bags had greater diameter and firmness per diameter, lower dry matter, soluble solids and nutrient levels, and less physiological storage disorders than early harvested fruits. Macronutrient contents were higher after storage in paper bags than in polyethylene bags.