Nitrate potential from sludge and inorganic fertilizer in soil leachate beneath an irrigated agricultural field
AuthorReid, Mary Elizabeth,1943-
Nitrates -- Environmental aspects.
Soils -- Leaching.
Sewage sludge as fertilizer -- Environmental aspects.
Committee ChairPepper, Ian L.
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PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractTwo sets of continuous deep soil cores were removed from a 4 hectare field during the third year of crop treatment. Samples were removed once following sludge addition and once 6 weeks later following inorganic fertilizer application and a 30 cm pre-planting irrigation. A total of 504 soil samples were analyzed for soil texture, gravimetric moisture content, electrolytical conductivity, and pH, as well as concentrations of NO₃ , Cl⁻ , NO₂, and organic C. After three annual sludge applications, soil beneath plots amended with sludge, had higher average water-extractable NO3 concentration than plots amended with inorganic fertilizer. From one sampling date to the next, the field-averaged concentration of NO₃ increased from 282 mg 1⁻¹ to 335 mg 1⁻¹ . Results suggest a trend of increasing NO₃ in the vadose zone.
Degree ProgramSoil, Water and Environmental Science