Effect of plant growth promotiong rhizobacteria on growth and yield of Seed tubers of Potato Cultivars Mini-tubers

In order to investigate the effect of plant growth promotiong rhizobacteria (PGPR) on yield and yield components of seed tubers of cultivation mini-tubers Potato, a Factorial experiment was caried out by based on complete randomized design at agriculurtal and natural resources research staition of Ardabil in 2016. The First factor included mini-tubers of three cultivars of potato: Agria, Khavaran, and Marfona:,The second factor included four treatments of plant growth promoting rhizobacteria (PGPR) (Azospirillum, Seudomonas and combination of two bacteria). Results showed that interaction of experimental factors was significant for all traits except biological yield and tuber diameter. Maximum of tuber yiled was observed in interaction effect of application of tow bacteria × cultivars. That did not have significant difference with cultivars of Agria and Khavaran. Maximum of number and weight of tuber were observed at Marfona×two bacteria. Maximum of tuber diameter was observed at Marfona. Maximum of plant height and number of main branch were observed at Agria, Khavaran and Azospirillum× Seudomonas bacteria. Maximium of biological yield was observed at combination of two bacteria. Minimum of this trait was observed in treatment without insemination. Maximum numbers of days to emergencation, number of days to stolon, formation, number of days to tuberization were obtined in Marfona and condition of application Azospirillum. Minimum of those traits were observed in Khavaran and condition whithout insemination.