Spodosols are soils made up of mineral material, presenting a spodic B horizon immediately
below the E, A horizon or hisstic horizon within 200 cm of the soil surface or 400 cm if the
sum of the A+E horizons or the hisstic horizons (with less than 40 cm) + And exceed 200 cm
in depth. Oxisols are soils made up of mineral material, with a latosolic B horizon preceded
by any type of A horizon within 200 cm of the soil surface or within 300 cm if the A horizon
is more than 150 cm thick. The objective was to study soils found in the Alto Solimões region
and generate information about their origins and occurrence, based on toposequences. The
result demonstrates in all profile horizons there is a predominance of the sand fraction, which
characterizes as a sandy texture, except in the Oxisol, which has a more clayey character. The
soils are dystrophic, poor in nutrients and have very high acidity, which naturally limits
agricultural productivity. In Espodosols, the primary vegetation of Campinarana is adapted to
oligotrophic conditions, in the Oxisol the vegetation is primary. For agricultural use, the
Typic Red-Yellow Dystrophic Latosol has good physical attributes, however it needs
nutritional corrections to improve fertility. Spodosols do not have good attributes, as they are
nutrient-poor soils.
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