Concept:Waterlogging occurs when the soil root zone becomes filled with excess water.
This creates poor aeration and disturbs normal soil conditions.
Explanation:When soil is waterlogged, the oxygen supply to plant roots is greatly reduced.
As a result, root development and crop growth are inhibited.
Aerobic soil microorganisms also become less active because oxygen is scarce.
Roots may fail to function properly due to excess moisture, leading to wilting of crops.
However, waterlogging does not normally encourage leaching.
Leaching is the washing down of nutrients by percolating water, but waterlogged soils have poor drainage and very slow water movement.
Thus, leaching is not enhanced by waterlogging.
Answer:B. enhancement of leaching