Trees on farms and their contribution to soil fertility parameters in Badessa, eastern Ethiopia

摘要: Surface (0–15 cm) and subsurface (30–45 soil samples from under canopy, edge of canopy away isolated Cordia africana Lam. Croton macrostachyus Del. trees their leaves were examined to investigate leaf nutrient content, root biomass the contribution on farms fertility parameters in Badessa area, eastern Ethiopia. Leaves C. had 20% higher P 25% lower K contents than those africana. The studied species comparable N content. Both produced shallow lateral roots that extended beyond zone. Typically, fine was observed surface soils soils. did not affect organic C, pH cation exchange capacity. tree canopies 22–26 12–17% N, respectively, corresponding canopies. available 34–50% Available content improved only canopy. more double for Trees both increased underneath exchangeable by 18–46% compared with controls. In conclusion, keep high via protection against leaching, translocation nutrients deeper layer accumulation litter, which create a temporary pool