Page 9 - NRG of commercial importance

GUttls

cm in height and 30 cm in width is removed
with the hglp of a bark shaver. The surface is
made very smooth and the thickness of the
bark left should not be more than 2 mm to
facilitate fieshening of the blaze. The blaze
fiame is kept on the stem in the vertical
portion, 15 cm above the ground level and the
position of the blaze is marked with a marking
gauge. The control groove is cut with a grove
cutter by drawing it from top to bottom. The
lip is then fixed in the tree with nails.
For freshening ofthe blaze, the tapper stands
near the tree on one side of the blaze and
holds the fteshening knife at the lowest point
ofthe control groove. The knife is then pulled
up by the tapper along with blaze line marked
on the tree. The depth of the rill is about 2
mm into the wood. After making a freshening
on both arms of the blaze a 1:1 mixture of
Ctp anllip methad.
dilute sulphuric acid (20%) and dilute nitric
acid (20%) is sprayed on the fieshly cut rill
number of disadvantages. Even though a
with the help of spray bottle. Exudation of
channel depth of 2.5 cm has been prescribed
oleoresin starts soon after the rills are made.
for the blazes, very often the depth exceeds
The pot containing the oleoresin is emptied
the prescribed limit. The inherent hacking
into a collection can. The resin adhering to
action involved in case of adze, makes it very
the pot is rernoved with the help of a scraper.
difficult to control the depth of the blazes.
The control groove is also increased to avoid
Also th€ tapper makes much deeper blazes in
accurnulation ofresin in it-
the hope of getting more resin. Deep cuts
around the hole results in loss of timber and
make the trees less resistant to wind storms.
Moreover, after covering the circumference of
rhe tree, a second cycle o[ tapping is not
possible because of the slow healing ofdeeper
blazes. This generally results in abrupt fall in
resin production.
o
(c) Rill methodr This is an improved method,
standardized at Forest Research Institute,
Dehradun to overcome the disadvantages of
the cup and lip method. In rill rnethod, the
bark ofthe tree over a surface area of about 45 Rill method I