has document part Changes of some properties of two degraded soils receiving sewage sludge. Characterization and classification of some types of soils based on ststistical multivariate techniques Dynamics of electrical conductivity, sulphates, chlorides, sodium and ammonium in a burned forest soil after sewage-sludge compost application Effect of several species of cadmium on urease activiyt, in a soil treated with sewage sludge Effects of an experimental fire on soil microbial populations in a Mediterranean environment Nutrient input by sewage sludge application to calcareous soil Statistical treatment of the recordered concentrations of O3 and NOx: a preliminary sep on the study of the soil receptor of chemicals leading to greenhouse effect.