Home Publications & Data Report Culticore : sustainable crop rotation and ley farming systems for the acid-soil savannas author(s) Friesen, Dennis K. published in1995 regions Colombia original file download full citation Friesen, Dennis Keith. 1995. Culticore : Sustainable crop rotation and ley farming systems for the acid-soil savannas. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 6 p.