The horizon of soil profile which encourages the greatest level of microbial activity is? by Sunday | Jul 4 | Agricultural Science WAEC | 0 comments A. A-horizon B. B-horizon C. C-horizon D. D-horizon Correct Answer: Option A – A-horizon Users Also Read These:The level of development of the soil profile is…In which layer of the soil profile does most…The most predominant action in the first horizon of…The soil horizon that is not supportive of the…The A-Horizon of the soil profile is also called the?