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This study was performed for a period of two years in 1993 - 1994 at the research of agricultural college of Tehran University on the apple trees (Golden delicious) grafted on M IX root - stock
This analyzing has been performed is a fractional experimental in randomized complete blocks design with 3 replications and 5 treatments which include Harvest date During the harvest dates and also storage period each 45 - days, 15 fruit sample from every replication was experimented by following test
Measured of the ethylene hormone of fruit , flesh firmness,titrable acidity (T.A) , total soluble solids (T.S.S) , pH and reduce weight in storage
At the end of storage , the yields from several harvest dates were examined in order to specify the teste , texture and qualitative apparently by the panel test persons , and the best harvest date for long storage was determined the results of comparing between ethylene and other aspects of harvest shows that increasing of ethylene happens 7-14 days after fast changes in quantities of firmness , starch and total soluble solid (T.S.S) , However only ethylene concentration was not a reliable index for determination of the best harvest date , but the use of this index with the usual index have higher reliable in commercial harvest date of apple fruits.
The change of qualitative factors invoice total soluble solid , firmness and titrable acidity during 6 month storage have a pattern like for this factors at harvest time although the different harvest date was affect fruit qualities directly after storage however results of panel test and qualitaive factors indicate that fruits Harvest at 147 days after fullbloom was the best
Harvest date for long term storage However in karaj climatic condition for longterm storage
was better that Golden delicious apple Harvested at 147 7 days after bloom