Farmers seek many potato crops on slopes of 15% and 35% without attention to soil and water conservation
which planting on ridges in the direction of the slope [11]. This condition leads to deterioration of land productivity,
which will lower the potato production and farmers' income [7]. Therefore, efforts to maintain the productivity of
the land by means of microbiological conservation, the use of microorganisms in the rhizosphere of potato plant
roots which can improve soil structure by the effort of aggregating soil through microorganisms such are bacteria
producing exopolysaccharide (EPS). Meanwhile, organic carbon particles improve soil aggregation when the
material forming the organic core surrounded by clay, ash particles and aggregates