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This study was carried out during two successive seasons 2010-2011 and 2011-2012 on Navel orange at fruit handling department, horticulture research institute, Giza, Egypt. Fruits were harvested at maturity stage from a private orchard in El-Fayoum governorate, Egypt. At the laboratory, fruits were dipped in 200 or 300 ppm of Salicylic acid or 10000 or 20000 ppm of Chito-care or the combination between the two doses from each compound. Other fruits were dipped in 1500 ppm of Imazalil, the commercial postharvest treatment to be used as control. Fruits were stored at 10°C and 85-90 R.H. for up to six months. Fruits were examined monthly intervals to determine the effect of these treatments on fruit physical and chemical properties. Results cleared that, weight loss and decay percentage, total soluble solids and total soluble sugars contents of orange fruits increased while fruit firmness, total acidity and vitamin C contents decreased gradually and significantly with the increasing of storage periods. Peel fruit color changed directly from green yellow to yellow with the increasing of storage periods. Postharvest treatments with either Salicylic acid or Chito-care significantly decreased weight loss, decay incidence, fruit firmness deterioration rate, the change of peel color, the decreasing rate of total acidity and vitamin C contents of orange fruits compared with the commercial postharvest treatment during storage. On the other side, there were no clear trends concerning the effect of these treatments on total soluble solids and total soluble sugars contents of orange fruits during storage. Moreover, the higher doses either alone or in combination with the other compound had the priority. In briefly we can conclude that, orange fruits postharvest treatments with any of the examined compounds with the higher dose to reduce postharvest decay incidence during transportation process or cold storage could be a successfull alternative to reduce the using of fungicide on orange fruits and to reduce its bad effects on consumer healthy and the environment.

journal of plant production

EFFECT OF POSTHARVEST TREATMENTS WITH SALICYLIC ACID AND CHITO-CARE ON NAVEL ORANGE FRUITS QUALITY AND STORABILITY COMPARED WITH THE COMMERCIAL POSTHARVEST FUNGICIDE TREATMENT