ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Maturity indices to predict optimum harvest date for the storage of Conference pears in the UK.

Johnson, D. S.; Luton, M. T.;

COST 94. The postharvest treatment of fruit and vegetables. Determination and prediction of optimum harvest date of apples and pears. Proceedings of a meeting, Lofthus, Norway, 9-10 June 1994. Year: 1996 Pages: 133-147 Ref: 9 ref.

1996

บทคัดย่อ

Changes in the firmness (F), soluble solids concentration (R, refractometer value) and starch-iodine staining pattern (S) of Conference pears from 2 orchards were monitored from 1989 to 1993. In addition, on up to 5 occasions, samples were taken for controlled atmosphere (CA) storage in 2% O2, <1% CO2 at -1 deg C for up to 8 months. Two maturity indices, F/(R x S) and F x (11 - S)/R, were calculated and related to the optimum harvest date (OHD) for each orchard in each year. The criteria used to determine OHD were (1) a minimum ex-store firmness of 40 N, (2) freedom from physiological disorders during storage and subsequent ripening, (3) low incidence of fungal rots, and (4) high sensory acceptability. A maturity index (F/(R x S)) of 0.8 was associated with a lack of storage problems except in 1992 when ex-store firmness was inadequate, even in the earliest harvested fruits. This index was superior to the currently used method based on starch disappearance only, and preliminary advice would be t

o commence harvesting of Conference pears at a maturity index of 0.9-1.1, which should provide 7 days of harvesting before the OHD index of 0.8 is reached. However, rapid loss of starch in some years, e.g. 1993, results in an unacceptably short notice of when to pick.