JAMB - Agricultural Science (2021 - No. 51)
The horizon of a soil profile which encourages the greatest level of microbial activity is
A - horizon
B - horizon
C - horizon
D - horizon
คำอธิบาย
The A-horizon is a weathered layer that contains an accumulation of humus (decomposed, dark-coloured, carbon-rich matter) and microbial biomass that is mixed with small-grained minerals to form aggregate structures.