[Field utilization of oil mill wastes. Effect on biochemical activity in soil [Calabria]]
2002
Gamba, C. | Piovanelli, C. | Simoncini, S. (Istituto Sperimentale per lo Studio e la Difesa del Suolo, Florence (Italy)) | Briccoli Bati, C. | Lombardo, N. | Ciliberti, C. | Gamba, A. (Istituto Sperimentale per l'Olivicoltura, Rende, Cosenza (Italy))
The object of this study is the effect on soil biochemical activities of waste water from olive oil mills, with traditional and continuous cycles. The waste water produces a brief increase in organic matter, soil biomass and microbial activities, in the low doses [50 and 80 cube m ha*[-1), respectively, for traditional and continuous cycle]. These modifications are transitory, in fact they disappear after few months. The plots with one dose and three doses of waste water (applied one time per month) show the same increase in biological activities, but in the latter the effects are greater because the effects of the last treatments are often added to residuals of the precedents. The enzymatic potential nitrifying activity (PNA) of soil is inhibited by the high dose of waste water in the 0-10 cm layer; with the low doses there are no changes. The different results found in the two types of waste water may be due to their different composition, as the ones from the traditional cycle have a higher COD and BOD and a higher content in mineral salts, whereas for centrifugation are richer in proteins. On the whole, in these experimental conditions, the distribution of waste water from olive oil mills has no negative influence on soil biomass and microbial activities
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