Persian walnut
(Juglans regia L.) is the most economically important cultivated species for
timber and nutritious nuts among 21 walnuts worldwide. Walnut has been planted
in Vietnam personally in a small number of areas in Northern provinces sharing
borderlines with China. The objective of this study was to survey
characteristics of fruits and nuts of 15 J. regia promising trees and discuss
their suitability as plus trees serving for intensive plantation. The results
indicated that fruit diameter ranges 40.41-49.7 mm, fruit weight ranges
38.12-70.81 g, nut diameter ranges 24.19-34.96 mm, and nut weight ranges
9.07-25.26 g. The nut to fruit ratio for diameter ranges 57.8-70.4% and for
weight ranges 20.4-35.7%. There existed positive linear relationships between
fruit weight and nut weight for 10 of 15 promising trees with regression/R2
>0.5. While relationships between fruit diameter and nut diameter generally
did not exist or existed with low regression (R2 <0.3). It is
concluded that six of 15 promising trees could be selected as plus trees for
intensive plantations through grafting technique. Those plus trees have a nut
to fruit ratio for weight >30% and high regressions between fruit weight and
nut weight.
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