No difference in SOC was observed between individual
agroforestry systems and pasture (data not
shown) nor between pooled agroforestry systems
and pasture (Table 4). Plots containing the heavy litter
producer V. guatemalensis showed slightly, though not
significantly, greater SOC than other treatments.
Fisher (1995) reported greater SOC after three years
with this tree species and V. ferruginea. Pasture soils
maintained a relatively high SOC status even though
they undoubtedly received less organic matter input
than soils under agroforestry systems.