Distributions of labeled nitrogen in the profile of a fertilized sandy soil
Isotopically labeled (/sup 15/N-depleted) ammonium sulfate (115 kg N ha/sup -1/) was applied to a Spodosol in a citrus grove, to determine the fate and subsequent distributions of NO/sub 3/-N and NH/sub 4/-N in the soil profile. The soil was tile-drained, and citrus trees were located on soil beds. The authors examined three soil management treatments: the original A1 horizon (ST): deep mixing of A1 and A2 horizons with the underlying Spodic horizon (DT); and incorporation of 56 Mg ha/sup -1/ of dolomitic limestone, along with deep mixing (DTL) of the profile. Soil samples were taken to the 70-cm depth in ST and to the 95-cm depth in DT and DTL soils and were extracted with 1 M KCl. Extracts were chemically analyzed for NH/sub 4/-N and NO/sub 3/-N concentrations and isotopic analysis was performed by mass spectroscopy. At 12 d after fertilization, both NH/sub 4/-N and NO/sub 3/-N values in the ST soil profile exceeded corresponding values for DT and DTL soils. This N was derived primarily from the fertilizer. With time, concentrations of both NH/sub 4/-N and NO/sub 3/-N decreased in profiles for all three soils; however, N concentrations in the ST soil consistently exceeded corresponding values for DT and DTL profiles.
- Research Organization:
- Univ. of Florida, Gainesville
- OSTI ID:
- 5744054
- Journal Information:
- Soil Sci.; (United States), Vol. 141:2; Conference: American industrial hygiene conference, Dallas, TX, USA, 18-23 May 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NITROGEN
ENVIRONMENTAL TRANSPORT
SOILS
COMPARATIVE EVALUATIONS
AMMONIUM SULFATES
CITRUS
FERTILIZERS
NITRATES
NITROGEN 15
TRACER TECHNIQUES
AMMONIUM COMPOUNDS
ELEMENTS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MASS TRANSFER
NITROGEN COMPOUNDS
NITROGEN ISOTOPES
NONMETALS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PLANTS
STABLE ISOTOPES
SULFATES
SULFUR COMPOUNDS
510200* - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
510301 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- Soil- (-1987)