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Pattern of volatilized nitrogen loss from dryland kikuyu pastures after fertilization

Pattern of volatilized nitrogen loss from dryland kikuyu pastures after fertilization Abstract The pattern of nitrogen (N) loss through volatilization as ammonia (NH3) may have important fertilizer management implications. A micrometeorological mass balance was used to measure this pattern after application of limestone ammonium nitrate (LAN; 28% N) and urea (46% N). Variables monitored included air temperature, relative humidity (RH), wind speed, and rainfall. The influence of these variables on patterns of NH3 loss was assessed graphically and by using Spearman's ranked correlation analysis. A daily pattern of loss was observed in the flux of NH3, with the greatest losses occurring between 10h00 and 14h00 on every sampling day. High temperatures and wind speeds promoted losses whilst rainfall events (in excess of 5 mm) inhibited losses, apparently by transporting applied fertilizer into the soil profile. Losses were suppressed at low temperatures, low wind speeds, and high RH. The highest overall loss recorded (3.7% of applied N) was lower than that expected for sub‐tropical conditions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png African Journal of Range & Forage Science Taylor & Francis

Pattern of volatilized nitrogen loss from dryland kikuyu pastures after fertilization

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Pattern of volatilized nitrogen loss from dryland kikuyu pastures after fertilization

Abstract

Abstract The pattern of nitrogen (N) loss through volatilization as ammonia (NH3) may have important fertilizer management implications. A micrometeorological mass balance was used to measure this pattern after application of limestone ammonium nitrate (LAN; 28% N) and urea (46% N). Variables monitored included air temperature, relative humidity (RH), wind speed, and rainfall. The influence of these variables on patterns of NH3 loss was assessed graphically and by using Spearman's...
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Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1727-9380
eISSN
1022-0119
DOI
10.1080/10220119.1993.9638329
Publisher site
See Article on Publisher Site

Abstract

Abstract The pattern of nitrogen (N) loss through volatilization as ammonia (NH3) may have important fertilizer management implications. A micrometeorological mass balance was used to measure this pattern after application of limestone ammonium nitrate (LAN; 28% N) and urea (46% N). Variables monitored included air temperature, relative humidity (RH), wind speed, and rainfall. The influence of these variables on patterns of NH3 loss was assessed graphically and by using Spearman's ranked correlation analysis. A daily pattern of loss was observed in the flux of NH3, with the greatest losses occurring between 10h00 and 14h00 on every sampling day. High temperatures and wind speeds promoted losses whilst rainfall events (in excess of 5 mm) inhibited losses, apparently by transporting applied fertilizer into the soil profile. Losses were suppressed at low temperatures, low wind speeds, and high RH. The highest overall loss recorded (3.7% of applied N) was lower than that expected for sub‐tropical conditions.

Journal

African Journal of Range & Forage Science – Taylor & Francis

Published: Aug 1, 1993

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