Roots of plants stable soils on slope and provide resistance against the forces that improve slope instability. In NW of Iran (East Azerbaijan Province), rangelands was Utilized with animal grazing and changed to agricultural land use; this vegetation is unsuitable vegetation on slope to stable them. We studied Lappula microcarpa to determine its root biomass characteristics. Data were collected with accidental sampling method (1*1 m) with 10-cm-diameter core in this aria. In total of 20 plots were collected and 100 samples were studied in this research. Minimum, maximum and mean root biomasses of this plant were 1.20, 3.00 and 2.1 gr, respectively.
