00929 #a2200457 #4500 aLibros aS 20140826164053.0 as a Hart, R.D 294-301 En CATIE-SC (176) A bean, corn and manioc polyculture cropping systems. I. The effect of interspecific competition on crop yield Costa Rica 1975 Competencia de cultivos Sistemas de cultivo Economía Yuca Manihot esculenta Frijol Phaseolus vulgaris Maíz Zea mays 6132 6132