Soil Evaluator Practice Exam 2025 – Complete Prep Guide

Silty clay loam soil is characterized by its unique texture and moisture-holding capacity, which contribute to its behavior when manipulated. One of the notable features of this soil type is its ability to form ribbons that can range up to 1.5 inches long and have a sticky feel when moist. This phenomenon occurs because silty clay loam contains a significant proportion of fine particles that allow it to retain moisture effectively.

The stickiness you feel when pressing and rolling the soil into a ribbon is primarily due to the presence of clay particles. In moist conditions, these clay particles can adhere together and create a cohesive mass. This is a key characteristic of silty clay loam, distinguishing it from other soil types, especially sandy soils that do not exhibit such plasticity or stickiness.

Understanding this characteristic is important for soil evaluators, as it helps determine the soil's suitability for various purposes, such as agriculture, landscaping, and construction. The ability to form ribbons and their tactile quality provides insights into the soil’s structure, drainage capabilities, and tilth, influencing decisions related to soil management and crop viability.