ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Physico-mechanical properties of "Gala" apples and stem-end splitting as influenced by orchard management practices and harvest date.

Opara, L. U.; Studman, C. J.; Banks, N. H.;

Journal of Agricultural Engineering Research Year: 1997 Vol: 68 Issue: 2 Pages: 139-146 Ref: 37 ref.

1997

บทคัดย่อ

Irrigation (frequent versus none), crop density (high versus low), and nitrogen (urea fertilizer versus none) influences on the physico-mechanical properties of mature 'Gala' apples were evaluated. Frequent irrigation and low crop density increased fruit size. Fruits from non-irrigated trees were firmer and had higher soluble solids concentration (SSC) compared to fruits from frequently irrigated trees. Fruits from trees with a low crop density were firmer and had higher SSC compared to fruits from trees with a high crop density. Nitrogen application had no significant effect on any measured fruit property, and both skin strength and stem adhesion force were not affected by orchard treatments. Analyses of fruit attributes at 3 harvest dates corresponding to early, mid, and late harvest showed that fruit mass and SSC increased towards late harvest, while flesh firmness and skin strength decreased with increasing fruit maturity. Stem adhesion force changed little during the harvest period. A compa

rison of stem-end split fruit and good fruit showed that split fruit had lower firmness, indicating that split fruits were physiologically more advanced in maturity and ripening.