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Zeolitized tuffs in pedotechniques to improve soil resilience against the impact of treatment by municipal sewage: balance of nutrient and noxious cations

Capra, Gian Franco and Buondonno, Andrea and Coppola, Elio and Duras, Maria Giustina and Vacca, Sergio and Colella, Carmine (2011) Zeolitized tuffs in pedotechniques to improve soil resilience against the impact of treatment by municipal sewage: balance of nutrient and noxious cations. Clay Minerals, Vol. 46 (2), p. 261-278. eISSN 1471-8030. Article.

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Abstract

Two zeolitized tuffs (ZTs), viz. a Neapolitan yellow tuff (NYT) and a clinoptilolite-bearing tuff (ZCL), were tested as pedotechnical materials to improve soil resilience against the impact of treatment by a "dirty" municipal sewage system (DSW). Soils (surface horizon) were a sandy, alkaline Entisol (Typic Xeropsamment), and a sandy-loam, sub-acidic Alfisol (Ultic Palexeralf). Results showed that the presence of ZTs resulted in several favourable effects. Electrical conductivity (EC) decreased and pH was buffered. Ammonium was selectively taken up from the DSW, making the zeolitized tuffs almost saturated by NH+4, by exchanging both beneficial cations, such as K+ and Ca2+, thus improving their potential availability to plants, and undesirable cations such as Na+, thereby hindering the exchangeable sodium percentage (ESP) increase and concurrent soil salinization-alkalinization. At the same time, NH+4 was stored as a potentially slow-release nitrogen fertilizer. The mobility of Pb, Cu and Zn dropped off to a large extent. NYT produced the best effects, and the Entisol gained the greatest benefit from treatments.

Item Type:Article
ID Code:6828
Status:Published
Refereed:Yes
Uncontrolled Keywords:Zeolitized tuffs (ZTs), "dirty" municipal sewage system (DSW), NH+4
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/14 Pedologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:Mineralogical Society
eISSN:1471-8030
Deposited On:01 Dec 2011 16:15

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