Which soil texture has the highest water-holding capacity?

Clay soil has the highest water-holding capacity due to its small particle size and extensive surface area. The fine particles in clay create a dense structure that can hold significant amounts of water in the tiny pores between them. This high water retention capacity allows clay soils to remain wet longer compared to other soil types, making it beneficial for certain crops, especially during dry periods.

In contrast, sandy soil, with its larger particle size and lower surface area, drains quickly and holds less water. Silt loam, while having a good balance of water-holding capacity and drainage, does not retain as much moisture as clay. Loamy soil, which is a mixture of sand, silt, and clay, provides a good balance of drainage and water retention but still falls short of the water-holding capacity of clay. Therefore, clay is the correct answer as it excels in retaining water due to its unique characteristics.