Aghilinategh, N., Hemmat, A., Sadeghi, M. and Vafaeian, M. 2010. The effect of three organic manures with different rates on shear strength properties of a silty clay loam soil. 6th National Congress on Agricultural Machinery Engineering and Mechanization, 14-15 September, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.