For earth worm activities determination, surface casts were
sampled from five randomly placed 1 × 1 m wooden quadrant
in each experimental unit at the end of rains at the third and
sixth year after planting. The cast were dried at 105˚C for
weight determination. From similar quadrants soil monoliths
(50 × 50 × 20 cm) were obtained using the Tropical soil Biol-
ogy and Fertility (TSBF) approach (Anderson and Ingram,
1993). Earth worm in each monolith were hand sorted and put
into 10% ethanol and later transferred to 40% formaldehydebefore being counted and weight for abundance and biomass
evaluation respectively.