الفهرس 
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Abstract
The present study carried out during two successive seasons 2007 and 2008 on eighteen fruiting guava trees at 7-year-old grown in commercial orchard located at Damietta province, Damietta governorate, Egypt. The selected trees almost were uniform and apparently diseases free. They were subjected to receive nine treatments including three pre-harvest foliar sprays with tap water along with two vitamin B12 solutions at 0.3 and 0.6 mgL-1 ten
days to harvest date. The harvested fruits after immediately transported to the laboratory of Pomology Department, Faculty of Agriculture, Mansoura University, thoroughly were cleaned and sorted for uniform in size, maturity and
freedom from defects and divided into 2 lots equal in fruits number 648fruits each. Each one contained nine treatments tested, three of them pre-harvest sprayed trees and the other ones were post-harvest soaking the harvested fruits in Ca Cl2 solution at 1.5% or 3.0% for 15 min before storing either at 8±1oC and 80-85% RH for 30 days (cold storage) or holding at ambient conditions of 27±1oC and 65-70% RH for 10 days. At harvest date, during cold storage period at 6-day-intervals and during holding at ambient conditions at 2-day-intervals . the stored fruits were subjected to measure three physical and six chemical characteristics to be used as criteria defining the best treatment to extend shelf life and keep acceptable fruit qualities during storage period.