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Abstract

In recent years studies have been made of the
variation in the physiology and disorder incidence of apples
within a tree and between trees in one orchard, within a
season and between seasons. One of the remaining problems
is that of between-site variation.
The existence of between-site variation is
traditional, and is regarded by orchardists as considerable
even when cultural treatments do not differ. For example,
the fruit of the Braeside area in Southern Tasmania grown at
an altitude of about 700 feet is reputed to be of superior
keeping quality to that grown at the general level of the
Huon Valley. Certain patterns of between-tree variation have
now been established (Martin and Lewis 1952, Martin 1954a,b)
which enable us to take account of some variables when making
a between-site comparison. This thesis describes an attempt
at such a comparison. It embodies investigations carried out
in the period 1954-1956, using small plots on different sites
in three localities in the Huon district of Tasmania, with a
view to finding answers to the following questions:
(1) Do differences between sites depart significantly
from the normal between-tree variation?
(2) Does fruit from high and low altitudes differ in
its susceptibility to disorders?
(3) If there are any site or altitude differences in
disorder susceptibility are they accompanied by
significant differences in the physiological characteristics of the fruit? If so, do these
differences tend to confirm or deny theories
developed from the between-tree studies?
(4) Are there any differences in the between-site
variation between seasons, and if so how far are
they in line with indications from the ideas
developed from other studies?

Item Type:	Thesis - Unspecified
Authors/Creators:	Lewis, TL
Keywords:	Apples
Copyright Holders:	The Author
Copyright Information:	Copyright 1956 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Bibliography: p.66-71. Thesis (M.Sc.)--University of Tasmania, 1957
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