Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.641517
Title: Microbial reduction of nitrate in irrigated soils after wastewater application
Author: Ben Farag, K. A.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2004
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Abstract:
Microbial reduction of nitrate in the top layer of irrigated soils during laboratory incubations was studied using acetylene inhibition and 15N recovery methods. The soils used were from two sites in the Thessaloniki plain in northern Greece. One site was the Galicos River Wastewater Treatment Experiment, where soil cores of clay loam and sandy silt loam were obtained from two areas, each irrigated either with wastewater or fresh water (well water), supplied by furrow for four years. The second site was the Axios Delta, irrigated by flooding, from which clay, clay loam and sandy loam soil cores were obtained. The maximum and minimum denitrification rates in soil cores from the Galicos River Wastewater Treatment Experiment were 2152 and 1.42 µg N kg -1 dry soil day-1 respectively in the presence of 81 µg carbon g-1 dry soil. The maximum and minimum rates observed from soil cores from the Axios Delta were 33,000 and 1.15 µg N kg-1 dry soil day-1 respectively in the presence of natural carbon concentrations at field capacity. A crust layer induced on the surface of repacked and intact soil cores from the Galicos River Wastewater Treatment experiment had no significant effect on denitrification rates. The average losses of nitrogen from the nitrogen fertiliser applied to these cores, and recovered as denitrified N2O gas, after irrigation with wastewater and well water were 42 and 33%, respectively. The corresponding loss of N from the topsoil cores from the Axios Delta was 21%. In addition, 15N recovery indicated that an average of 43 and 51% of the nitrogen fertiliser applied to the Galicos River cores was unaccounted for at the end of incubation. An average of 18% of the nitrogen fertiliser applied to the soil cores from the Axios Delta was unaccounted for at the end of incubation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.641517  DOI: Not available
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