Which type of soil is known for having the best water-holding capacity?

Clay soils are known for their excellent water-holding capacity due to their fine particle size and structure. The small particles of clay create a large surface area, allowing them to retain moisture more effectively than other soil types. This retention is beneficial for plant growth, especially during dry periods when water availability is crucial.

Clay soils can hold water in small pores between the particles, which slows the drainage process. This characteristic can help sustain moisture levels in the soil, making it available to plants over extended periods. Additionally, clay's ability to form aggregates contributes to its structure, allowing for better water retention in specific contexts.

In contrast, silt soils, while also capable of holding moisture to a certain extent, do not match the water-holding capabilities of clay. Sandy soils have larger particles with greater drainage and aeration but tend to dry out quickly, limiting their water-holding capacity. Rocky soils lack the fine particles necessary for significant moisture retention, resulting in a much lower water-holding capacity overall.