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Ítem Effect of poro (Erythrina berteroana) and madero negro (Gliricidia sepium) associated with Brachiaria brizantha over spatial nutrient distribution, microbial biomass and earthworm density; compare with a Brachiaria brizantha and Arachis pintoi association(CATIE, Turrialba (Costa Rica)) Esquivel Quirós, J.O.