บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Stem-end splitting and internal ring-cracking of 'Gala' apples as influenced by orchard management practices.

Opara, L. U.; Hodson, A. J.; Studman, C. J.;

Journal of Horticultural Science and Biotechnology Year: 2000 Vol: 75 Issue: 4 Pages: 465-469 Ref: 25 ref.

2000

บทคัดย่อ

Stem-end splitting and internal ring-cracking of 'Gala' apples as influenced by orchard management practices.

The influences of irrigation (frequent versus none), crop density (high versus low), and nitrogen (urea fertilizer versus none) on the incidence of stem-end splitting (SES) and internal ring-cracking (IRC) in Gala apples were studied in an orchard at Hastings, New Zealand. Of the three orchard management factors considered, only irrigation significantly affected the incidence of stem-end splitting and internal ring-cracking; while the increase in fruit splitting due to low crop density was marginal. Frequently irrigated trees produced over twice as many split and ring-cracked fruits, respectively, as non-irrigated trees. The incidence of both SES and IRC increased with advancing fruit maturity, and percentage splitting in the experimental orchard varied considerably from 0.7% to over 28% for single tree replicates. None of the orchard treatments affected fruit nitrogen and other major nutrients (Ca, P, K and Mg), but fruits with SES or IRC had significantly higher concentrations of Ca, P and K t

han good fruits. The increase in the concentration of these minerals in split or ring-cracked fruits may be a secondary response which probably occurred after cortical cells began to break down as a result of stem-end splitting or internal ring-cracking.