Effects of cutting height and methods of mother trees on growth of scions of Camellia varieties in Nghe An and Quang Ninh province
Keywords:
Canopy grafting,, Camellia sasanqua,, Camellia vietnamensisAbstract
Many areas of camellia plantations in localities have now been degraded.
So productivity and quality of fruits and seeds are decreasing, leading to
low economic efficiency. In order to improve the productivity and qualit y
of the these plantations, canopy grafting is a quick solution for harvesting
with higher yield and quality. The results of research on technical measures
of grafting and changing the canopy for varieties of Camellia spp. by
cutting the stump of the mother tree at different heights and by different
methods of cutting the mother tree to create grafted shoots have shown that, the scions in the experiments grew and developed relatively well and
initially showed great promise in restoring the old, degraded camellia
plantations. After 24 months of grafting, the scions of the camellia varieties
in the experiment had the average survival rate ranging from 81.19 -90.63% and there was no difference between the experimental treatments.
The scions of both camellia varieties in the experimental treatments showed
relatively good growth and there were differences between the
experimental treatments. With both varieties of Camellia sasanqua and
Camellia vietnamensis, the treatment left the cutting height of 1.5 m and
the treatment of cutting the mother tree in groups for the best growth of the
scions. Although the grafting time was only 2 years, some of the scions in
the experimental treatments of both varieties of camellia had flowered,
especially in the experiment on cutting height of the mother trees. The
variety of Camellia sasanqua gives the ratio of flowering scions from 8.52
- 17.15% and not yet bearing fruit, the ratio of scions flowering on average
ranges from 23.33 - 34.80% with the rate of fruiting branches is 3.8%.
Meanwhile, in the experiment on the method of cutting the mother trees,
only in the treatment of cutting the whole mother tree in groups with 5% of
the scions flowered but did not bear fruit.
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