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<abstract language="eng">This paper reports a study, from a chemical arid microcheniical point of view, of the soil potassium in the type of soil originating from the Arenito Bauru. A mechanical separation of the soil was carried out in order to study the potassium distribution in the soil. The fractions 0.250 to 0.105 mm, 0.105 to 0.053 mm, 0.053 to 0.020 mm, 0.020 to 0.010 mm and 0.010 to 0.002 mm were isolated. The chemical data, i. e., the exchangeable and the total potassium content pointed out the occurrence of primary minerals of potassium in the fractions, 0.250 to Ò.105 mm, 0.105 to 0.053 mm and 0.053 to 0.020 mm. A simple microchemical technique was performed by which it was possible to differentiate the potassium bearing mineral from quartz, ilmenite, magnetite and other minerals. Primary minerals of potassium were found in those fractions and this fact indicated that the total potassium content in the samples studied was due to the presence of those minerals

Identificação microquímica de minerais primários de potássio no solo