Neste trabalho foram determinados os teôres em Fósforo, Magnésio, Potássio e Enxôfre de 5 solos, sendo 2 arenosos e 3 terras roxas. Os teôres dêsses elementos foram avaliados por quatro métodos microbiológicos empregando Aspergillus niger e nove métodos de extração química, com a finalidade de observar até que ponto os resultados, dos diferentes métodos eram comparáveis entre si e com ensaios de campo.

The present work was undertaken to ascertain the comparability of results from different analytical methods with field trials. Five soils were analyzed for their content of P, K, S and Mg. Two soils were of the sandy type and 3 of “terra roxa” type. The amount of the elements was determined using four microbiological methods based on Aspergillus niger growth and nine chemical methods based on chemical extraction of the elements from the soil.