تاثير بعض المواد الكيميائية في نوعية ثمار البرتقال ابوسرة و مدي تحملها لشروط التخزين

This research was conducted during 2010-2011 growing seasons on 15 years old trees of “Washington Navel” variety grafted on Citrus aurantium (sour orange) stock and planted in the village of “Al-hinnady” in Lattakia. To determine the appropriate pre-harvest and post-harvest treatments to get the most production and better quality of fruits. The results were as follows: Fruit weight was affected clearly by pre-harvest treatments especially (Potassium nitrate 5% + CaCl2 2%) which gave the highest value (304.98 g), and showed significant on other treatment . Pre-harvest treatment (Potassium nitrate 5% + CaCl2 2%) and post-harvest treatments (CaCl2 2%) showed the highest values of fruit firmness (0.32; 0.36 kg/cm2, and the results of statistical analysis showed any significant differences between the two treatments and the other treatments. Pre-harvest treatment (Urea 2% + CaCl2 2%) and post-harvest treatments (CaCl2 2%) showed the highest content of vitamin C (40.97; 41.14 mg/100ml), and the results of statistical analysis show significant differences between the two treatments and the other treatments.