Caracterização física e química de três perfis de solo, Alto Solimões - Amazonas

Abstract

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.