Agriculture Reference
In-Depth Information
Growth of 'Lane's Prince Albert' trees grafted
directly on rootstock roots or on rootstocks with both root and stem
Table
.
Girth of trunk at years old (cm)
Rootstock
Method of working
'M.
'
'M.
'
Seedling
'M.
'
On root
.
.
.
.
On stem at
.
.
.
.
On stem at
.
.
.
.
Significant ratio for rootstocks with the same method of
working
).
Effect of method of working non-significant.
'Lane's Prince Albert' is rather more vigorous than 'M.
=
.
(
p
=
.
'.
Adapted from Beakbane and Rogers ( ), with permission.
twice as large as those of 'Starking Delicious' on its own roots (Gyuro and
Gondor-Pinter,
' about twice as
large as those of 'Greensleeves' on its own roots although the latter trees are
larger than those of 'Greensleeves' on 'M.
) and those of 'Greensleeves' on 'MM.
' (Webster
et al.
,
). Limiting
the size of apple root systems by root pruning (Geisler and Ferree,
)orby
growing them within a root restriction membrane (Atkinson
et al.
,
) also
reduces shoot growth.
.
The main effect of a rootstock can be induced by the root system itself without involvement
of the rootstock stem
. When scion trees of 'Lane's Prince Albert' were grafted on
a range of rootstocks either directly on to root or on to rootstock stem, most
of the rootstock effect on scion vigour was shown when the rootstock root
alone was used (Beakbane and Rogers,
), although the presence of a
piece of rootstock stem intensified this (Table
). The relative importance of
rootstock stem may, however, be greater in the case of 'M.
.
' in view of the
effects of budding height on 'M.
' and of length of 'M.
' interstock noted
in Chapter
.
.
Dwarfing rootstocks may be less effective than vigorous ones in uptake of nutrients and
their supply to the shoot
. When uniform rooted stems (layers) of 'M.
', 'M.
' and
' were given
P a month after being established in solution culture the
uptake within
'M.
hours, expressed as counts per minute per g shoot per mg
root was four times as high with 'M.
' (vigorous) as with 'M.
' (dwarfing), with
'M.
). A similar pattern was found
for the uptake of
P and
Ca into scions of 'McIntosh' grafted on 'M.
' being intermediate (Bukovac
et al.
,
',
'M.
'.
Under orchard conditions the supply of nutrients is not usually limiting for
growth and is controlled by scion demand, and although trees on different
' and 'M.
