ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Influence of sampling date and position in the tree on mineral nutrients, maturity and gel breakdown in cold stored 'Songold' plums.

Taylor, M. A.; Rabe, E.; Dodd, M. C.; Jacobs, G.;

Scientia Horticulturae Year: 1993 Vol: 54 Issue: 2 Pages: 131-141 Ref: 24 ref.

1993

บทคัดย่อ

Plums (Prunus salicina cv. Songold) were harvested on 3 dates, 7 days apart, from top and bottom sectors of trees trained on a palmette system. Fruit maturity at harvest, assessed in terms of skin ground colour, flesh firmness, soluble solids, titratable malic acid and soluble solids to acid ratio, was significantly affected by harvest date and canopy position. Delayed harvest was associated with advanced maturity, and, within trees, bottom fruits were more mature than top fruits. Similarly, these parameters measured after storage at -0.5 deg C for 10 days, followed by 18 days at 7.2 deg and 7 days at 10 deg , indicated that fruit quality was also affected by harvest date and canopy position. Other quality indices affected were gel breakdown, overripeness and decay. Best overall fruit quality was obtained in earlier harvested fruits with a ground colour of 2.6 as measured with an apple colour meter and a flesh firmness of 5.2 kg. More mature fruits developed the most gel breakdown, and in fruits

 harvested latest, concentrations of N, P, K, Ca and Mg were lower than in earlier harvested fruits, and were farthest away from the optimal levels for good fruit quality. Susceptibilty to postharvest decay [unspecified] was also highest in fruits harvested at the latest date.