m Jannati - M.Sc Student of Horticulture Department of Agriculture, Science and Research Branch, Azad Islamic University, Tehran, Iran
v Abdoosi - Assistant of Horticulture Department of Agriculture ,Science and Research Branch, Azad Islamic University, Tehran, Iran

INTRODUCTION: Strawberry is kind of mortal and short-living fruits after harvest, using essential oils which is natural and also using Calcium Chloride that has the calcium cause this fruit to be more lasting. In this study tried to figure out the different concentration of essential oils, Thymus vulgaris, Thymus kotschyanus and Calcium Chloride on some factors of postharvest of strawberry.MATERIALS AND METHODS: This research was conducted in a completely randomized design with 4 treatments each with 3 replicates. Essential oils, T.vulgaris and T.kotschyanus in 0-100-200-300 μl/l and Calcium Chloride 0-100-200-300 mg/l concentration are used in this experiment. Measured factors and methods used are: the amount of total soluble solid (TSS) using refractometer and Brix index, the amount of vitamin C according to Nisperos-Carriedo & Busling(1992), the amount of soluble sugar according to Fulai et al. (2000) and the activity of Oxidized polyphenols enzyme (PPO) according to Manoranjan & Mishram (1976).RESULTS AND DISCUSSION: The results showed that using the 300 μl/l concentration of T.vulgaris in comparison to other concentration were significant in TSS, vitamin C and Soluble sugar. The 200μl/l concentration of T.vulgaris and T.kotschyanus and the 300 mg/l concentration of Calcium Chloride have increased the rate of activity of PPO. Using essential oils because of being antifungal, also Calcium Chloride increase postharvest strawberry fruits.

Essential oils, Calcium Chloride , Postharvest, strawberry