Research conducted at the Agricultural Research Center in Idleb Governorate to investigate the effect of the treatment with bread yeast in some growth and productivity characteristics of Agria potato variety. Complete randomized block design was established with 5 replicates. The treatments used were soaking the tubers for plantation with foliar spray, foliar spray only and control without any treatment. The following measurements were recorded in this research: plant height, plant yield, biological yield and block productivity. Results indicate that the treatment of yeast soaking and spraying was significantly higher in all the studied parameters compared to the control. Whereas the treatment of yeast spray only was significantly higher of the control in plant productivity and experimental block yield. While the treatment of yeast soaking and spraying was significantly upper of the treatment of yeast spray only in the productivity per plant.
