Volume 47 Number 3 Article 6 Pages: 153-160
Year 1993 Month 7
Title: The yield and fruit quality of 18 longan
Authors: E.C. Winston, P.J. O'Farrell and K.E. Young
Citation
Abstract:
The yield and fruit quality of 18 longan
(Dimocarpus longan Lour.) cultivars imported
from China (3), Taiwan (2), Thailand (5), Florida (4), and Hawaii (3) and 1 local selection
were evaluated on the Atherton Tableland of
North Queensland, Australia (Lat. 17°S) between
1982 and 1991. Cropping was irregular with the
best yields in years with extended winter periods
with mean daily minimum temperature < 12°C
although the degree of cropping could not
consistently be related to winter temperatures.
Mean yields on older trees (data from tree ages
of 3 to 13 years) were 3 to 79 kg and 7 to 35 kg
on younger trees (data from 3 to 9 year old
trees). 'Chompoo IF (78.8kg/tree), 'Beow Keow'
(57.8) and 'Chompoo V (45.7) were the heaviest
yielders of the older trees.
Tuhko 2' (35.0
kg/tree) and 'Duan Yu' (32.6) yielded best of
the more recently planted cultivars.
Average
fruit weights ranged from 5.3 to 11.0 g with
'Beow Keow,' 'Homestead,' 'Kay Sweeney' and
'Kohala' the only cultivars to have average
weights > 10 g.
Brix ranged from 16 to 21°
except for 'Chien Liou' (10.3°). Most cultivars
were crisp in texture with a sweet taste.
Mean
flesh recovery (% aril) varied from 57 to 70%
with most cultivars in the low to mid 60s. 'Kay
Sweeney' had the best recovery. 'Beow Keow,'
'Dang,' 'Duan Yu,' 'Fuhko 2,' 'Haew,' 'Kay
Sweeney,' and 'Kohala' were the only cultivars
to have > 80% of fruit of commercial size (> 22
mm diameter). 'Kay Sweeney' (early season),
'Kohala' (early), 'Fuhko 2' (mid) and 'Beow
Keow,' 'Haew,' 'Dang' and possibly 'Chompoo
I' (all late) are the recommended cultivars for
commercial planting.
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