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Singh, Bal Ram ,  Rao, Idupulapati M. ,  Barrios, Edmundo ,  Amézquita Collazos, Edgar ,  [Potential of tillage, agropastoral, and planted fallow systems in low-fertility tropical soils in Latin America] ,  Potential of tillage, agropastoral, and planted fallow systems in low-fertility tropical soils in Latin America