What can lead to issues in soil structure during drying and wetting cycles?

What can lead to issues in soil structure during drying and wetting cycles?

• A. High sand content
• B. Presence of a water table
• C. Shrink and swell behavior
• D. High organic matter

Answer: (C)

The presence of shrink and swell behavior in soils is a significant factor that can lead to issues in soil structure during cycles of drying and wetting. This behavior is primarily associated with clay-rich soils, where the clay particles expand when wet and contract upon drying. This ongoing cycle can create physical stresses within the soil matrix, leading to the formation of cracks and voids that disrupt the structural integrity of the soil. As the soil dries, the clay particles pull together, resulting in shrinking, which can create fissures and alter porosity. Conversely, during wetting, water fills these voids, causing the soil to swell. If this process occurs repeatedly, it can weaken soil structure over time, impacting its ability to retain water and nutrients effectively. This dynamic can ultimately result in a less stable and less productive soil environment.

The presence of shrink and swell behavior in soils is a significant factor that can lead to issues in soil structure during cycles of drying and wetting. This behavior is primarily associated with clay-rich soils, where the clay particles expand when wet and contract upon drying. This ongoing cycle can create physical stresses within the soil matrix, leading to the formation of cracks and voids that disrupt the structural integrity of the soil.

As the soil dries, the clay particles pull together, resulting in shrinking, which can create fissures and alter porosity. Conversely, during wetting, water fills these voids, causing the soil to swell. If this process occurs repeatedly, it can weaken soil structure over time, impacting its ability to retain water and nutrients effectively. This dynamic can ultimately result in a less stable and less productive soil environment.