ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Reduction of brownheart in Conference pears.

Roelofs, F. P. M. M.; Jager, A. de;

Postharvest Horticulture Series - Department of Pomology, University of California Year: 1997 Issue: No. 16 Pages: 138-144 Ref: 5 ref.

1997

บทคัดย่อ

Experiments were carried out to study factors that cause brownheart in Conference pears over 3 seasons (1994-1996). Fruits were harvested from 7 orchards, varying widely in susceptibility to brownheart. The variables studied were harvest date, fruit position on the tree, delayed cooling, delay in the application of controlled atmosphere (CA) storage regime during cold storage and CO2 concentration (0.5, 1.5 or 3.0% CO2). The incidence of brownheart (browning and cavity formation) in storage increased with later harvest and increased CO2 concentration in storage. Delaying postharvest cooling by 2 days increased the incidence of brownheart at all harvest dates. A cooling period of up to 50 days preceding establishment of CA conditions decreased the incidence of brownheart without affecting fruit quality significantly. Fruits from the tops of trees showed more brownheart than those from lower parts. The time course of internal browning and appearance of cavities strongly suggests that cavities aris

e from the brown areas, the 2 symptoms belonging to one common disorder. Thus, by harvesting at the correct date, cooling immediately following harvest, delaying establishment of CA conditions by at least 20 days, and using a low CO2 concentration in CA, the risk of brownheart in storage can be minimized.