The study was carried out at Agroforestry Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar, during 2010-11 to study the effect of tree densities on soil physico-bio-chemical properties under eight year old poplar based agrisilvicultural system. Treatment consisted of four tree densities as main plot and four soil depths as sub-plot were studied in split plot design with three replications.Poplar tree density showed significant effect on soil physico- chemical and biological properties of soil profile. The soil bulk density was significantly lower under trees...