Reference soil Peru 08: Acrisol
Acrisols occur dominantly in the wetter parts of the tropics and subtropics and the warm temperate regions in relatively young landscapes.
Characteristics
Soils having an argic horizon (a subsurface horizon with distinct higher clay content than the overlying horizon), which has a cation exchange capacity of less than 24 cmolc per kg in some part, either starting within 100 cm from the soil surface, or within 200 cm from the soil surface if the argic horizon is overlain by loamy sand or coarser textures throughout. They have a base saturation (total amount of Ca, Mg, K and Na with respect to the cation exchange capacity) of less than 50 percent in the major part between 25 and 100 cm from the soil surface
Reference soil PE008: Acrisols
Short field description A deep, well drained, red (sandy) clay. Below 90 cm is the soil more coherent and extremely firm. The soil site is located in 'Tierra Firme' i.e. terrain not flooded by rivers, on the summit of the hill along the road. The clay increase is sufficient for the recognition of an argic B horizon in FAO (1988) classification system and the soil classifies as Haplic Acrisol. However, because no cutans were observed in the field, no argillic horizon can be defined in FAO (1974). Therefore the soil classifies in FAO (1974) as Dystric Cambisol.