رسول اسدی - گروه کشاورزی، دانشگاه پیام نور، تهران، ایران
الهام مهرابی گوهری - گروه کشاورزی، دانشگاه پیام نور

In order to investigate the effect of irrigation intervals on yield, water use efficiency and yield components of tomatoes, a field experiment was carried out during ۲۰۱۵ and ۲۰۱۶ growing seasons in experimental farm in Jiroft. The treatments were laid out as split plot based on Randomized Complete Block Design with three replications. The treatments were comprised of three cultivars of tomato (Norat Falkato and Titauo) in main plot and sub plot consisted of three irrigation levels (۱۰±۲, ۱۵±۲ and ۲۰±۲ mm evaporation for class A pan). The results showed that in comparison to ۱۰ and ۱۵ mm evaporation for class A pan, parsimony of water usage equal ۹۷۰ m۳.ha-۱ achieved. Moreover yield, height of plants, number of fruits per plant, weight and diameter of fruit decreased ۷.۴, ۸.۶, ۲.۸, ۷.۲ and ۹.۵ percent, respectively, But water use efficiency increased ۱۲.۴ percent. On the other hand studied parameters of Falkato variety was better than the other cultivars. Also, planting Falkato variety and ۱۵ mm evaporation for class A pan was in the best position in terms of water use efficiency. In order to increase water productivity and optimal use of water resources, it is suggested cultivation Falkato variety with ۴۰ irrigation, at ۴ days interval and ۱۰۰ cubic meters of water in of greenhouse condition.        In order to investigate the effect of irrigation intervals on yield, water use efficiency and yield components of tomatoes, a field experiment was carried out during ۲۰۱۵ and ۲۰۱۶ growing seasons in experimental farm in Jiroft. The treatments were laid out as split plot based on Randomized Complete Block Design with three replications. The treatments were comprised of three cultivars of tomato (Norat Falkato and Titauo) in main plot and sub plot consisted of three irrigation levels (۱۰±۲, ۱۵±۲ and ۲۰±۲ mm evaporation for class A pan). The results showed that in comparison to ۱۰ and ۱۵ mm evaporation for class A pan, parsimony of water usage equal ۹۷۰ m۳.ha-۱ achieved. Moreover yield, height of plants, number of fruits per plant, weight and diameter of fruit decreased ۷.۴, ۸.۶, ۲.۸, ۷.۲ and ۹.۵ percent, respectively, But water use efficiency increased ۱۲.۴ percent. On the other hand studied parameters of Falkato variety was better than the other cultivars. Also, planting Falkato variety and ۱۵ mm evaporation for class A pan was in the best position in terms of water use efficiency. In order to increase water productivity and optimal use of water resources, it is suggested cultivation Falkato variety with ۴۰ irrigation, at ۴ days interval and ۱۰۰ cubic meters of water in of greenhouse condition.   Keywords: Drip Irrigation, Different Varieties, Evaporation Pan, Tomato, Water Use Efficiency

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