Effects of field methods and soil cover on estimating ammonia loss from nitrogen-15-urea
- North Carolina State Univ., Raleigh (USA)
Ammonia loss from urea fertilizers is difficult to measure accurately in the field. In a field study we compared two methods for measuring NH{sub 3} loss from {sup 15}N-urea surface applied to bare and bermudagrass (Cynodon dactylon L.) covered Captina silt loam. The two methods were semi-open chambers and open microplots using {sup 15}N recovery. Labeled urea was applied at 100 kg N ha{sup {minus}1}, and chambers and microplots were shaded and protected from rainfall. Estimates of NH{sub 3} losses from the bare soil after 357 h were 24.6 and 48.0% of the applied N from the semi-open chambers and open microplots, respectively. Estimates of NH{sub 3} losses form the bermudagrass after 357 h were 34.5 and 42.7% of the applied N for the semi-open chambers and open microplots, respectively. In the bermudagrass microplots, 78.6% of the applied {sup 15}N either remained in the plant-thatch layer above the soil or was volatilized 18 h after urea application. Transport and transformations in the soil had little influence on NH{sub 3} loss from bermudagrass plots. These data indicted that measured NH{sub 3} loss from bare soil in semi-open chambers was significantly less than NH{sub 3} loss in open microplots using {sup 15}N recovery techniques. Cumulative NH{sub 3} losses from urea retained on bermudagrass and thatch above the soil were similar in the semi-open chambers and open microplots.
- OSTI ID:
- 5302196
- Report Number(s):
- CONF-881108--
- Journal Information:
- Soil Science Society of America Journal; (USA), Journal Name: Soil Science Society of America Journal; (USA) Vol. 52:3; ISSN SSSJD; ISSN 0361-5995
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMIDES
AMMONIA
CARBONIC ACID DERIVATIVES
FERTILIZERS
GRASS
HYDRIDES
HYDROGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
LILIOPSIDA
LOSSES
MAGNOLIOPHYTA
METABOLISM
NITROGEN 15
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN ISOTOPES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLANTS
SOILS
STABLE ISOTOPES
UREA