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Summary In a composite profile of a soil, derived from volcanic ash (La Reunion), and in the surface horizon of a vertisol (Ivory Coast) the activity of the samples taken was explored by way of in… (More)
The authors give 4 observations, made in Rennes (France), of 3 cases contracted in France and 1 in Canada, cases they think to be related, for 3 at least, to the infectious entity described by… (More)
Summary CO 2 evolution has been measured for two soils whose type of clay stands in strong contrast: montmorillonite in a tropical vertisol, allophane in an andosol. The results show how the organic… (More)
Summary Respirometry and percolation experiments indicate that a supply of mineral P mobilizes, beyond a given threshold, considerable amounts of humic matter and increases the level of ammonia-N,… (More)