Previous sludge addition effects on nitrogen mineralization in freshly amended soil

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

DOI:https://doi.org/10.2136/sssaj1988.03615995005200010019x· OSTI ID:6906611

Lindeman, W C; Connell, G; Urquhart, N S

An experiment was conducted to determine the effects of previous sludge additions on N mineralization in a freshly amended soil. A secondary objective was to further delineate statistical models of N mineralization potential (N/sub 0/) and the mineralization rate constants k and h. The Glendale clay soil (fine-silty, mixed thermic, Typic Torrifluvents), with either no previous sludge amendment or sludge applied at the rate of 67.3 Mg ha/sup -1/ in 1982 or 1983 in the field, was freshly amended with 30 g kg/sup -1/ of gamma irradiated, dried, anaerobically digested sewage sludge in 1985. Triplicate samples of each soil (unamended, amended in 1982, and amended in 1983) and each sludge treatment (no amendment and freshly amended) were incubated aerobically for 16 wk at 0.01-MPa moisture potential and 35/sup 0/C. Periodically the soils were leached with 0.01 M CaCl/sub 2/, and the leachate was analyzed for inorganic and organic N. Previous sludge amendment had no effect on the mineralization of fresh sludge. Soils previously amended in 1982 and 1983 leached 56 to 60 mg kg/sup -1/ more NO/sub 3//sup -/ + NO/sub 2//sup -/ than unamended or freshly amended soils never amended with sludge. Total organic N mineralization averaged 65.4% and was independent of soil amendment history or fresh sludge amendment. Values of N/sub 0/, k, and h were estimated by nonlinear least squares for several nonlinear models. The best fit of the data resulted from modeling N mineralization as the sum of an exponential equation (of the rapidly decaying organic N fraction) and a constant (of the slowly decaying organic N fraction).

• Research Organization: New Mexico State Univ., Las Cruces (USA)
• DOE Contract Number: AS04-76ET33626; AC04-83AL21776
• OSTI ID: 6906611
• Journal Information: Soil Sci. Soc. Am. J.; (United States), Journal Name: Soil Sci. Soc. Am. J.; (United States) Vol. 52:1; ISSN SSSJD
• Country of Publication: United States
• Language: English

Related Subjects

510101* -- Environment
Terrestrial-- Basic Studies-- Radiometric Techniques-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CHLORIDES
CHLORINE COMPOUNDS
DISSOLUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENVIRONMENTAL EFFECTS
GAMMA RADIATION
HALIDES
HALOGEN COMPOUNDS
IONIZING RADIATIONS
KINETICS
LEACHING
MATHEMATICAL MODELS
MINERALIZATION
NITRATES
NITRITES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
RADIATIONS
REACTION KINETICS
SEPARATION PROCESSES
SLUDGES
SOILS
STATISTICAL MODELS