Abstract PEREZ C, Alexander and VERTEL M, Melba. Colonization of arbuscular mycorrhizae in Bothriochloa pertusa (L) A. Camus pasture. Rev. MVZ Cordoba [online]. 2010, vol. 15, n. 3, pp. 2165-2174. ISSN 0122-0268. Objective. Evaluate in situ the colonization of arbuscular micorrhizae, in grass roots colosuana in function of the physical and chemical characteristics of the soil, in cattle farms of four agroecological areas of the savannah physiographical sub region. Materials and methods. The determination of the