Step 1: Identify the soil types marked as A and B.
In the given diagram, the soil marked as A is \textit{Floodplain soil}, and the soil marked as B is \textit{River terrace soil}.
Step 2: Describe Floodplain soil (A).
Floodplain soil is deposited by river floods, characterized by fine, alluvial material. It is rich in nutrients and is often used for agriculture due to its fertility.
Step 3: Describe River terrace soil (B).
River terrace soil is found on raised riverbanks and terraces formed by the periodic movement of rivers. It has well-drained, coarse-textured soil that is less fertile than floodplain soil due to its limited nutrient availability.
Step 4: Which soil is more fertile and why?
The soil marked as A (Floodplain soil) is more fertile than the soil marked as B (River terrace soil). This is because floodplain soil is frequently replenished with fresh, nutrient-rich deposits during floods, making it more suitable for agricultural use.
