Which soil type forms stable casts that can withstand moderate handling?

Loam is a soil type that is a balanced mixture of sand, silt, and clay, which contributes to its desirable properties for stability and handling. The combination of these soil particles allows loam to form stable aggregates or "casts" that can withstand moderate handling without easily breaking apart. This structural stability is essential for various applications, such as gardening or construction, where soil needs to maintain its integrity when manipulated.

The presence of clay in loam provides cohesiveness, while the sand contributes to drainage and aeration, and silt adds fertility. This unique balance helps create a soil environment that can support plant growth while being manageable for human activity.

In contrast, sandy loam, while also a good soil, may not have the same level of cohesiveness and stability due to the higher sand content, which can lead to less structural stability in agitating or handling. Clay soils, while they do form stable structures, tend to be more compact and can be prone to becoming waterlogged, making them less practical for moderate handling. Silt loam has good moisture retention but can also be fragile under manipulation, similar to sandy loam. Thus, loam stands out as the most stable and manageable option among them.