The uppermost part of a soil profile is also called the organic layer which is enriched in organic materials. Hence, the region with the greatest concentration of organic material is the Top layer(A)
- The Upper layer of a soil profile consists of materials such as plant roots, bacteria and fungi which constitutes it's richness in organic materials.
- These layer is usually very dark and plants derive a lot of nutrient ’s required for growth here.
Hence, the top layer has the greatest concentration of organic materials.
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