Soil Evaluator Practice Exam

Sandy soil is characterized by large, loose particles, which contributes to its rapid drainage capabilities. The particle size of sand is significantly larger than that of clay or silt, leading to greater spaces between the particles. This structure facilitates quick water movement through the soil, allowing it to drain effectively. This efficient drainage is beneficial in preventing waterlogging but can pose challenges for plant growth since sandy soils often do not retain moisture or nutrients as well as finer-textured soils.

In contrast, clay soil consists of very small particles that are tightly packed together, leading to slow drainage and poor aeration. Silty soil, while it has finer particles than sand, can retain moisture and has better nutrient-holding capabilities, but it does not drain as quickly as sandy soil. Loamy soil is a balanced mixture of sand, silt, and clay, and, while it has good drainage, it is not defined primarily by the rapid drainage characteristic of sandy soil. Thus, sandy soil is the clear choice for describing soil that has large, loose particles and facilitates rapid drainage.