Nitrogen mineralization potential and nitrogen transformations of sludge-amended soil

Conference · · Soil Sci. Soc. Am. J.; (United States)

OSTI ID:6047548

Lindemann, W C; Cardenas, M

A clayey soil (Glendale, a Typic Torrifluvent) and a sandy soil (Latene, a Typic Calciorthid) were amended with three rates (0.15, and 30 g kg ) of gamma irradiated, dried, anaerobically digested sewage sludge. Before incubation and periodically during incubation, the soils were leached with 0.01M CaCl2 and the leachate analyzed for NH4 , NO2 , and NO3 . Cumulative (NO3 + NO2 )-N at the end of 32 weeks was dependent on sludge rate, but not on soil type or the soil type-sludge rate interaction. Mineralization rates decreased rapidly the first two weeks, followed by a slower decrease with time. Rates were higher in sludge-amended soil than in unamended soil. The best estimates for sludge-amended soil were obtained by modelling N mineralization as the sum of two exponentials. Total and net mineralization were greater in the Glendale soil than in the Latene soil. Total mineralization increased with sludge addition, but net mineralization decreased with sludge addition. Denitrification losses probably accounted for the discrepancies between total and net mineralization. Denitrification increased with sludge addition and was greater in the Glendale than the Latene soil.

• Research Organization: New Mexico State Univ., Las Cruces
• OSTI ID: 6047548
• Conference Information: Journal Name: Soil Sci. Soc. Am. J.; (United States) Journal Volume: 48:5
• Country of Publication: United States
• Language: English

Related Subjects

510100* -- Environment
Terrestrial-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DENITRIFICATION
ELEMENTS
GROUND DISPOSAL
KINETICS
MANAGEMENT
MATHEMATICAL MODELS
MINERALIZATION
NITROGEN
NONMETALS
REACTION KINETICS
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOILS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES