AMMONIUM SULFATE CAS N°: 7783-20-2

OECD SIDS
AMMONIUM SULFATE
3. ENVIRONMENTAL FATE AND PATHWAYS ID: 7783-20-2
DATE: 18.04.2006
treated catchment showed that soils were the dominant sink
for the labeled ammoniun. Surface soils (Oea horizon plus
any underlying mineral soil to 5 cm depth) assimilated 19 to
31 percent of the 42 kg/ha of labeled ammonium-N additions.
Of the three forest types on the catchment, the soil:
biomass assimilation ratio of labeled-N was highest in the
spruce forest, intermediate in the beech-dominated hardwood
forest and lowest in the mixed hardwood-spruce forest.
Although ammonium sulfate additions led to increases in
streamwater nitrate, only 2 of the 13 kg/ha of nitrate-N
exported from the catchment during the 2 years of tracer
additions was derived from the 42 kg/ha of labeled
ammonium-N addition.
Reliability: (1) valid without restriction
study well documented and assignable
28-MAY-2004 (41)
Media:
soil-biota-air
Method:
Various N fertilizers were applied to winter wheat under
field conditions. Ammonium sulfate was distributed at the
beginning of tillering, and was tested at 16 g N/m2 in a
microplot experiment. Gas traps of 4.4 dm3 were laid between
the rows of the microplots and ammonia, nitric oxide, nitrous
oxide, dinitrogen oxide and nitrogen contents of trapped soil
air were analyzed by gas chromatography duringn vegetation.
Result:
The N losses measured at the different samplings were not
higher than 1.2% of the N doses applied in the field. The
complete transformation of the fertilizers took place
practically within 11 weeks after their distribution to
wheat grown in the field. The composition of the nitrogenous
gases changed during vegetation depending on the applied
fertilizer. The proportion of N2O increased within the total
amount of nitrogenous gases in the field traps. Among the
nitrogenous gases tested, N2 showed by far the highest and NO
the lowest concentration.
Test condition: slightly acidic brown forest soil
measurement period: 13, 41, 62, 76 and 108 d
Reliability: (1) valid without restriction
study well documented and assignable
28-MAY-2004 (45)
Type of measurement: other: leaching from soil
Media:
leachate from lysimeter
Method:
An identical experimental protocol was followed in six
European coniferous forest soils, with different soil
characteristics, pollution histories and climate, to measure
the effects of enhanced (NH4)2SO4 deposition on lysimeter
throughfall. The sites are located in: Clonegal (IRL) - brown
soil, clay/silty clay, stand = Picea abies, cation exchange
buffer range, C/N 14.5, past N input 9.6 kg/ha/a, pHH2O
4.2.Fontainebleau (FR), - Podsol soil, loamy sand, stand =
Pinus sylvestris, aluminium buffer range, C/N 27.0, past N
input 10.5 kg/ha/a, pHH2O 3.9.Grizedale (UK) - brown soil,
clay, stand = Picea abies, aluminium buffer range, C/N 15.8,
past N input 13.3 kg/ha/a, pHH2O 3.7.Haldon (UK) -brown soil,
clay loam, stand = Picea abies, cation exchange buffer range,
C/N 13.8, past N input 17.3 kg/ha/a, pHH2 4.3.Solling (DE) -
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