Texas FFA Nursery Landscape Practice Exam

The classifications of soil particles based on size are sand, silt, and:

1. Loam

2. Gravel

3. Shale

4. Clay

The correct answer is: Clay

The classification of soil particles based on size includes sand, silt, and clay. Clay is characterized by its extremely small particle size, with individual particles measuring less than 0.002 millimeters in diameter. This fine size gives clay its unique properties, such as high plasticity and the ability to hold water and nutrients well. In contrast to sand, which has larger particles and allows for quick drainage, and silt, which is intermediate in size, clay's compact and small particles contribute to its cohesive behavior and high water retention. Understanding these classifications is essential for soil management in horticulture and landscape design, as they affect water drainage, nutrient availability, and root growth.