Which classification corresponds to high water holding capacity?

The classification corresponding to high water holding capacity is above 6. In soil science, the water holding capacity of soil is influenced by its texture and structure, which are associated with the size of the soil particles. Generally, soils that have a higher proportion of finer particles, such as clay, have an increased ability to retain water due to their smaller pore spaces that hold moisture more effectively. This leads to a higher holding capacity, categorized at values above 6.

In contrast, soils with values below 4 typically indicate a lower water holding capacity, often seen in coarse, sandy soils that do not retain water well and allow it to drain quickly. Soils that fall between 4 and 6 might possess moderate water retention but do not reach the higher capacity seen in those classified above 6. Thus, the classification above 6 is recognized as ideal for applications where high water retention is crucial, such as in agricultural or conservation efforts.