AbstractMajor soils of the plains of the Riberalta-Guayaramerín region in northeastern Bolivia are probably Tropeptic Haplustox. They are highly weathered, leached, very deep, well drained and porous, and have strong structural stability. Colors are yellow to red. Iron concretions and plinthite are an evident feature in some B horizons. The soils are strongly acid and low in CEC and bases. Inherent fertility is extremely low, but physical properties and topography favor the development of an intensive, permanent agriculture, if the soils are adequately managed.
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