Agriculture Reference
In-Depth Information
requirement'. Such dormancy parallels the bud dormancy of temperate-zone
fruit trees. It is an adaptive characteristic for which there would be natural
selection pressure in cold-winter environments in which early seed germina-
tion would lead to seedling death by winter freezing. Westwood and Bjornstad
(
) found that pear species from warm-winter envi-
ronments required less chilling to break seed dormancy than those from cold-
winter environments. This suggests the possibility of very different seedling
production systems.
) and Westwood (
Root production in the nursery
Seedlings produce a tap root. If a branched root system is desired this is
achieved by under-cutting the seedlings when small.
Seedling root system growth
Tamasi (
) found that intensive root production by seedling rootstocks after
planting in the orchard began only at
years of age under conditions where
this happened with 'M.
years of age. He found that over the years the
dominanceofthetaprootwaslostasthelateralrootsbecamebetterdeveloped.
'at
References
Abbott, D.L. (). Temperature and the dormancy of apple seeds.
Report of the
th International Horticultural Congress Section a
, -.
Abod, S.A. and Webster, A.D. (). Root and shoot growth of
newly-transplanted apple trees as affected by rootstock cultivar, defoliation
and time after transplanting.
Journal of Horticultural Science
, - .
Afensev, G.K. (). Growth of the active roots of apple trees in the
autumn-, winter- and early spring period [in Russian].
Trudii N... Sad. Vin i
Vin
,
: - .
Ashiru, G.A. and Carlson, R.F. ( ). Some endogenous rooting factors
associated with rooting of East Malling II and Malling Merton apple
clones.
Proceedings of the American Society for Horticultural Science
, -.
Atkinson, C.J., Webster, A.D., Vaughan, S.J. and Lucas, A.S. (). Effects of
root restriction on the physiology of apple tree growth.
Acta Horticulturae
,
.
Atkinson, C.J., Webster, A.D., Vaughan, S.J., Taylor, L. and Kingswell, G.
(
-
). Interactions between root restriction, irrigation and rootstock
treatments on 'Queen Cox' apple trees: effects of soil and plant water
relations.
Journal of Horticultural Science and Biotechnology
,
-
.
Atkinson, D. (
a). The root system of Fortune/M.
.
Report of the East Malling
Research Station for
, -.
Atkinson, D. (b). Some general effects of phosphorus deficiency on growth
and development.
New Phytologist
, -.
Atkinson, D. (). Some observations on the distribution of root activity in
apple trees.
Plant and Soil
, -.
