Low porosity in soil most commonly leads to which two issues?

• A. Poor infiltration and poor aeration
• B. High infiltration and good aeration
• C. Rapid drainage and low water holding capacity
• D. Dry surface crust formation

Answer: (A)

Porosity controls how water and air move through soil. When porosity is low, there are fewer pore spaces for water and for air to occupy and move through. Water has a harder time entering the soil, so infiltration is slow or poor. At the same time, limited pore spaces restrict gas exchange, so aeration is poor. This combination is common in compacted or fine-textured soils where the pore network is restricted. Other possibilities—like rapid drainage or good aeration—don’t fit because they require more or better-connected pore spaces. Dry surface crust can occur as a symptom of poor infiltration, but the fundamental pair tied to low porosity is slow water entry and limited air movement.