| Summary: | The incorporation of organic fertilizers to the soil turns its structure granular and/or crumbly, thus favouring both water retention and distribution and root and microorganism breathing, and adding not only organic carbon but also other macronutrients. Industrial sludge samples -aerobically treated effluents- from a jelly factory were used. The objective of this work is to characterize those sludges with the necessary precision to allow a feasibility analysis of their use as organic fertilizers under the prevailing laws. Two spraydried samples a week -taken at random- were analyzed during a month. Analyses (in quintuplicate) were as follows: Apparent Density, Actual Density, pH, Carbon, Nitrogen, Phosphorus, Calcium and Potassium. Statistical analyses for each variable (Mann-Whitney Test, Kolmogorov-Smirnov Test, Levene Statistic and Anova) were performed in two temporal senses: a transverse (every week) one and a longitudinal (along four weeks) one. Each variable was found not to depend on the sampling place or time, sludges chemical composition being considered stable.
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