عنوان مقاله [English]
In order to study the effect ofplant distance and tuber size on yield and yield components of potato varieties, a factorial experiment was conducted based on randomized complete block design, at research station of Islamic Azad university, Tabriz branch during 2003-2004. Factors were variety in two levels, seed distance on planting rows in two levels and four levels of tuber size. Results of two year combined analysis showed that three way interaction of "year*variety*plant distance" for main stem numbers trait was significant, expressing different response of variety and plant distance upon mentioned trait in two years. Also interaction of year*variety, year*plant distance and year*tuber size for yield was significant, that represented different response of varieties for yield and different impressibility of yield by plant distance and tuber size during two years. Results revealed that Mourn was superior to Cosmos variety in most studied traits. Plant distance of 20 cm on implant rows increased yield and main stem numbers and 25 cm planting distance was impressible for production of less small and more moderate and large tubers. Tuber size of 35-55 mm was the best size in all studied traits. Overally, the results showed that treatment compound of Mourn variety, 20 cm seed distance and 35-55 mm tuber size was the best treatment. However, while the farmers have to cut tuber, the treatment compound of Mourn variety, 20 cm seed distance and oversize of 55 mm tuber was the most desirable treatment. According to different responses of potato varieties to plant distance and tuber size, incorporation of variety, plant density and tuber size.should be regarded to obtain high yield.