ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest losses of mechanically injured onions after curing.

Yoo, K. S.; Pike, L. M.;

HortScience Year: 1995 Vol: 30 Issue: 1 Pages: 143 Ref: 2 ref.

1995

บทคัดย่อ

Bulbs of onion cv. Texas Grano 1015Y were hand-harvested and cured for 1 week at 24 plus or minus 2 deg C and 40-50% RH with forced ventilation. Bulbs then received 3 types of mechanical injury treatment: (i) bulbs were cut vertically approx equal to 5 mm deep at 4 locations equally spaced around the bulb; (2) bulbs were dropped twice on a flat, hard surface from a height of 80 cm; (3) bulbs were cut and then dropped, as in (1) and (2), respectively. Controls were not injured. Bulbs were stored at 24 plus or minus 2 deg and 40-50% RH for 5 weeks in ventilated boxes, each containing 40-45 bulbs. Onions from treatments (1) and (3) lost more than twice as much water per day as those in treatment (2) or controls. Water loss rates were similar for (2) and controls. The difference between (1), (3) and controls decreased as the storage period progressed. Total weight loss was mainly due to water loss during the first 3 weeks, and then to Botrytis decay (infected bulbs were discarded); although it contr

ibuted to weight loss, the percentage of decay was statistically insignificant. Total weight loss (water + Botrytis loss) for controls and treatment (2) was about half that for the other treatments during the first 3 weeks of storage. After 5 weeks, all injured lots had lost at least twice as much weight as the controls.