Phosphorus solublizing bacteria and zinc sulfate utilization effects on yield and yield components of two potato cultivars in Markazi province environment

To study the effect of Phosphorus solublizing bacteria (PSB) and zinc sulfate utilization on yield and yield components of potato cultivars this experiment was done in potato fields at Tooreh village in Sarband، Markazi province at 2010. Treatments were consisted of two potato cultivars “Agria and Markyz” in main plots and utilization and non utilization of zinc sulfate and with and four levels Phosphorus solublizing bacteria were in sub plots. Experiment model was spilt factorial in three replicates at 2010. Treatments were two potato cultivars Agria and Markyz، and two levels of Zink foliar application and without and phosphorus utilization in four levels included 100 kg/ha triple super phosphate، Triple super phosphate 100 kg/ha and PSB bacteria، PSB alone، and 50 kg/ha triple super phosphate with PSB. The results showed that the biomass yield، plant height، potato tubers numbers per plant and tuber yield had significant difference by applied experiment treatments. The results also suggest that all potato traits studied were significant advantages compared to Markyz to control. In all cases of PSB utilization with chemical phosphorus fertilizer we observed that potato characteristics were improved. Agria was more sensitive than Markyz about phosphate availability. In low phosphate condition، Markyze potato tubes dry weight was reduced from 81 to 51 g. this changes was from 66 to 54 g for Agria cultivar too.