Study on the effective condition and factores for decreasing losses of grape Through the harvesting time, storage and supply to the market

Grape fruit use in large amounts and in different types (fresh, raisin, vinegar, juicy, and wine). Every year, amounts of grape preserve to supply out of season. But, traditional methods of grape preservation decrease quality and crop weight, largely. The present research was conducted to study different factors which affects on shelf-life of grape, and to achieve to more information on optimum condifions and requirments for preserving of quality of fruit after harvest in order to increase its shelf-life in cold-room, and to mininize rate of qualitative and quantitative losses when it supply out of season. For this, two Fakhri and Shast-e-Arous cultivars (late-ripen with high preservation ability, and main cultivars in Qazvin) were selected. The grapes fruits were affected by treatments inclading: disinfection using fungicide solutions pre- or post-harvest, So2 gas before transferring to cold-room, and interaction between them. Then they placed in boxes contented 3 and 6 kg, for 30, 60 and 90 days under 0-1ºC in cold-room. Before placing of boxes in cold-room, variables such as fresh weight and TSS of each treatment were noted, and after existence of boxes from cold-room other factors such as weight reduction (%), infected fruits to disease (%) and healthy fruits (%) were measured. The experiment was conducted as factorial based on CRD with 3 repications. Comparison of the means were carried out using Duncan's multiple range test (DMRT). The results showed that: Shast-e-Arous cultivar had storable properties better than Fakhri. Fumigation using SO2 was more effective in control of fungi growth. Boxes 3 kg due to having higher percent of healthy fruits were more suitable than 6 kg. However, rate of weight reduction was higher in 3 kg boxes than 6 kg.With increase of preservation time, decreased quality and quantiy of fruits. Keyword: Grape, Shelf-life, Cold-room, Disinfection, Cultivars, Boxes contented, So2, Infected to disease