|Authors: ||S.H. Lai, N.C. Chen, S. Shanmugasundaram, S.C.S. Tsou|
Evaluation trials of commercial onion (Allium cepa L.) varieties were conducted at the Asian Vegetable Research and Development Center (AVRDC) from 1988 to 1991. In 1988, 60 varieties were collected and included in observation trials.
Evaluation trials were carried out in subsequent seasons using the selected elite varieties from the observation trials.
Wide variations in yield and horticultural characteristics were found among the entries.
The 10 selected elite varieties performed very well and consistently gave high yields.
The average marketable yields ranged from 51.4 t/ha to 81.4 t/ha across the 4 years' trials with a maturity range of 121–140 days.
Except for the local control variety Tainung no. 3, all the entries produced large and heavy bulbs averaging from 304 to 379 g.
Relatively low brix readings indicating low dry matter were found in these high-yielding varieties grown under subtropical conditions.
The mean brix readings of the 10 varieties were from 5.6 to 10.2. The five highest yielders were NIZ1003, XPH3325, Granex Y PRR, Granex 429, and Henry's Special.
The potential of growing these high yielding short-day onions in the tropics is discussed.
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