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University of Arizona (1992)

Soil microbial activity as an indicator of soil fertility : the long-term effects of municipal sewage sludge on an arid soil

Brendecke, Jeffrey Walter

Titre : Soil microbial activity as an indicator of soil fertility : the long-term effects of municipal sewage sludge on an arid soil

Auteur : Brendecke, Jeffrey Walter.

Université de soutenance : University of Arizona

Grade : Master of Science 1992

Résumé
This study measured the effects of four years of municipal, anaerobically digested sewage sludge application on long-term soil microbial activity in a Pima clay loam (Typic Torrifluvent) growing Upland cotton (Gossypium hirsutum L.). Treatments were one unfertilized control, sludge applied at optimum rates for plant growth (based on N requirements), and sludge applied at three times the optimum rates (a total of 8.01 and 24.2 Mg ha⁻¹ (dry weight over four years)). Soil microbial activity was measured by viable heterotrophic plate counts for bacteria, actinomycetes and fungi ; acridine orange direct counts for bacteria ; the dehydrogenase assay ; and carbon dioxide evolution analysis. As the high sludge treatment significantly reduced cotton plant stand and significantly stimulated some parameters of microbial activity (dehydrogenase activity and CO₂ evolution), soil microbial activity may not serve as a reliable predictive index of plant response to sludge-applied pollutants.

Mots clés : Hydrology. ; Soil microbial ecology. ; Soil fertility. ; Sewage sludge

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Page publiée le 17 octobre 2013, mise à jour le 22 février 2018