They are also called light soils. This group includes soils in which the percentage of sand is more than 70% and the percentage of clay is less than 15%. Generally speaking, these soils are dominated by the properties of sand. That is, they have a low capacity to retain moisture and nutrients and cultivation practices are easily carried out. The movement of air, water and root growth in the soil is unimpeded. Sandy soils must be adequately irrigated and fertilized rationally with frequent and small doses. Very poor sandy soils are used only in forests (pine forests), while richer sandy soils (with a higher percentage of clay) are used for rye and potatoes. Soils where the percentage of sand is not overwhelmingly greater than that of clay are also found and are therefore classified as sandy soils.