In the passage pruning is introduced as a positive practice, which improves the well being as well as shape of a tree. However, the lecturer argues against such premises and gives an example of a Silver maple tree to develop his argument.
Firstly, according to the passage, top pruning is supposed to limit the growth rate of a tree. The lecturer asserts that this can force the tree to make side branches to compensate for the lost ones in an accelerated rate. Thus, the tree reaches its full size while its root is not strong enough, and can become a hazard especially in stormy weather.
Secondly, the passage believes that cutting off some branches improves the nourishment of the remained parts. In contrast, the lecturer contends that losing the leaves leads to reduced rate of photosynthesis, which will result in starvation. This makes the tree vulnerable to diseases and pest insects.
Finally, passage suggests that top pruning keeps the shape of a tree in eye-pleasing boundaries. The lecturer opposes to this by indicating how pruned trees may take an abnormal shape, as in his example the pruned maple tree had 7 weak branches instead of one major trunk and 3 to 4 side branches.
In the
passage
pruning
is introduced
as a
positive
practice, which
improves
the
well being
as well
as shape of a
tree
.
However
, the
lecturer
argues against such premises and gives an example of a Silver maple
tree
to develop his argument.
Firstly
, according to the
passage
, top pruning
is supposed
to limit the growth rate of a
tree
. The
lecturer
asserts that this can force the
tree
to
make
side
branches
to compensate for the lost ones in an accelerated rate.
Thus
, the
tree
reaches its full size while its root is not strong
enough
, and can become a hazard
especially
in stormy weather.
Secondly
, the
passage
believes that cutting off
some
branches
improves
the nourishment of the remained parts.
In contrast
, the
lecturer
contends that losing the
leaves
leads to
reduced
rate of photosynthesis, which will result in starvation. This
makes
the
tree
vulnerable to diseases and pest insects.
Finally
,
passage
suggests that top pruning
keeps
the shape of a
tree
in eye-pleasing boundaries. The
lecturer
opposes to this by indicating how pruned
trees
may take an abnormal shape, as in his example the pruned maple
tree
had 7 weak
branches
instead
of one major trunk and 3 to 4 side
branches
.