|
IS0
I N T ER N AT1 O N A L O R G A N 1 Z AT1 O N FO R S TA N DAR Di 2 AT1 ON
IS0 RECOMMENDATION
R 873
PEACHES
GUIDE TO COLD STORAGE
1st EDITION
November 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
---------------------- Page: 1 ----------------------
BRIEF HISTORY
The IS0 Recommendation R 873, Peaches - Guide to cou storage, was drawn up by Technical
Committee ISO/TC 34, Agricultural food products, the Secretariat of which is held by the Magyar
Szabvanyügyi Hivatal (MSZH).
Work on this question by the Technical Committee led to the adoption of a Draft IS0
Recommendation.
In September 1966, this Draft IS0 Recommendation (No. 1029) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Australia Hungary South Africa, Rep. of
Brazil India Turkey
Bulgaria Iran U.A.R.
Chile Israel United Kingdom
Colombia Italy U.S.S.R.
Czechoslovakia New Zealand Yugoslavia
France Poland
Germany Romania
One Member Body opposed the approval of the Draft :
Netherlands
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in November 1968, to accept it as an IS0 RECOMMENDATION.
-2-
---------------------- Page: 2 ----------------------
ISO/R 873-1968 (E
IS0 Recommendation R 873 N overn ber 1 968
PEACHES
GUIDE TO COLD STORAGE
INTRODUCTION
This IS0 Recommendation provides guidance of a very general nature only. Because of the variability
of the fruit according to the time and place of cultivation, local circumstances may make it necessary
to specify other conditions of harvesting or other physical conditions in the store.
This IS0 Recommendation does not apply unreservedly, therefore, to all varieties in all climates, and
each specialist will himself decide on any modifications to be made.
Moreover, this IS0 Recommendation does not take into account the role played by horticultural
factors, and wastage during storage is not dealt with. The importance of these two subjects has not
been forgotten, but the influential factors, i.e. ecological or agrotechnical factors, are not very well
known. Moreover, the origin of many of the most frequent physiological disorders of peaches is still
uncertain, as are often the appropriate means of combating them. It has therefore seemed difficult to
prepare international recommendations on these two points.
Nevertheless, it has seemed useful to give in an Appendix and for purposes of record. a few recommen-
dations which appear sufficiently well founded in the present state of knowledge.
Subject to all possible restrictions arising from the fact that fruits are living material and may vary
considerably, the rigorous application of the recommendations contained in this IS0 Recommen-
dation and its Appendix should enable much wastage in cold storage to be avoided and in most cases
long-term storage to be achieved.
1. SCOPE
This IS0 Recommendation described methods for obtaining conditions for the successful cold
storage of peaches.
2. CONDITIONS OF HARVESTING AND PUTTING INTO STORAGE
2.1 Harvesting
It is difficult to characterize the correct maturity for harvesting.
The most frequently used practical criteria for determining the best time for harvesting are
- the basic ground colour* of the outer skin;
- the hardness of the flesh, estimated by means of a spring penetrometer;
- the age of the fruit from all flowering.
~
*
The basic ground colour should be distinguished from the anthocyanin red pigmentation, the intensity and
extent of which vary according to the variety and to a certain extent with the exposure to sunlight.
---------------------- Page: 3 ----------------------
ISO/R 873-1968 (1
These criteria are not universally valid - for a given variety they vary from one region to
another and it is for the grower to decide on his own criteria for picking, on the basis of
experience.
The basic ground colour and the recommended hardness vary according to the variety. In
general it is advisable to pick the fruit at the time when their colour varies between green and
yellow.
At the time of picking the flesh should be firm, somewhat juicy, with a slight aroma and
slightly acid.
2.2 Quality characteristics for storage
Fruit put into cold storage should be sound, free from bruises or physiological disorders and
free from any visible sign of fungal or bacterial attack. It should be clean.
2.3 Various treatments
For most varieties the fruit should be rapidly cooled after harvesting. Certain varieties, for
example Elberta and Red Haven, are sensitive to this treatment, however, and show a
tendency to cotton-wool texture. Treatment with iced water, to which sodium hypochlorite
has been added, has sometimes been recommended, as also has treatment with wax.
2.4 Putting into storage
The fruit should be put into the c
...