Root Distribution Effects on Nutrient Uptake and Soil Erosion in Crop-Forage Systems on Andean Hillsides - Zhinping, Q; Rao, Idupulapati M.; Ricaurte Oyola, José Jaumer; Amézquita Collazos, Edgar; Sanz Scovino, José Ignacio; Kerridge, Peter C. (1998)