Publication Date
1993
Description
A micrometeorological mass balance was used to determine nitrogen volatilised as ammonia from dryland Pennistetum clandestinum (kikuyu) pasture. Treatments included 2 levels of N {ISO and 300 kgN/ha, applied in 3 dressings) from limestone ammonium nitrate and urea. Volatilised N was measured after N application and during subsequent grazing periods. Overall, volatilised N was lower than expected for subtropical conditions (4.4% of applied N). Higher losses were recorded when sward height was reduced from IO cm to 3 cm. The mean difference was 764±109 gN/ha {P.05) for 33 h after the application of urea at 50 kg N/ha.
Citation
McKenzie, F R. and Tainton, N M., "Volatilized Nitrogen from a Tropical Pennisetum clandestinum Pasture in South Africa" (2024). IGC Proceedings (1989-2023). 11.
https://uknowledge.uky.edu/igc/1993/session42/11
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Volatilized Nitrogen from a Tropical Pennisetum clandestinum Pasture in South Africa
A micrometeorological mass balance was used to determine nitrogen volatilised as ammonia from dryland Pennistetum clandestinum (kikuyu) pasture. Treatments included 2 levels of N {ISO and 300 kgN/ha, applied in 3 dressings) from limestone ammonium nitrate and urea. Volatilised N was measured after N application and during subsequent grazing periods. Overall, volatilised N was lower than expected for subtropical conditions (4.4% of applied N). Higher losses were recorded when sward height was reduced from IO cm to 3 cm. The mean difference was 764±109 gN/ha {P.05) for 33 h after the application of urea at 50 kg N/ha.
