ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Calyx-end splitting and physico-chemical properties of 'Pacific Rose'TM apple as affected by orchard management factors.

Opara, L. U.; Tadesse, T.;

Journal of Horticultural Science and Biotechnology Year: 2000 Vol: 75 Issue: 5 Pages: 581-585 Ref: 27 ref.

2000

บทคัดย่อ

Leaf water relations, fruit properties and incidence of fruit splitting in 5- to 6-year-old apple cv. Pacific Rose trees grown on MM.106 rootstock were investigated in a field experiment in Palmerston North, New Zealand. On 10 November 1998, three weeks after full bloom (WAFB), trees were thinned or left to crop naturally to provide 2 crop load situations (314 and 147 fruit per tree for high and low crop loads, respectively). 10 of the 20 trees studied were rainfed until they were covered with under-canopy polyethylene tents on 23 January 1999 (14 WAFB) to exclude rainfall from the root zone (non-irrigated). The other 10 trees were rainfed throughout the experiment and also received supplemental irrigation starting from 16 December 1998. Fruit splitting developed at 20 WAFB. Withholding irrigation reduced splitting incidence by 46%, whereas low crop load increased it by 61% compared with high crop load. There was no significant interaction between irrigation and low crop load. Low crop load and

frequent irrigation increased leaf water potential and fruit water potential, which contributed to growth stresses. An increase in fruit size and maturation accompanied by a reduction in fruit firmness in low crop load and irrigated trees contributed to the high incidence of splitting. Controlling fruit size and growth rates may offer potential management strategies for reducing the incidence of splitting in Pacific Rose.