Nitrogen volatilized during the grazing of dryland kikuyu pastures
作者:
F.R. Mckenzie,
N.M. Tainton,
期刊:
African Journal of Range & Forage Science
(Taylor Available online 1993)
卷期:
Volume 10,
issue 2
页码: 92-95
ISSN:1022-0119
年代: 1993
DOI:10.1080/10220119.1993.9638330
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Using a micrometeorological mass balance method, a study was undertaken to assess volatilized nitrogen (N) losses during and after the grazing of drylandPennisetum clandestinumHochst. (kikuyu) pastures. Specific objectives were to measure the magnitude of volatilized N loss and to establish the pattern of volatilized N loss over time. Nitrogen losses measured over a period of 120 h ranged from 88 to 946 g N ha‐1(at a stocking rate of 3 AU ha‐1), and from 240 to 2 685 g N ha‐1(at a stocking rate of 6 AU ha‐1stocking rate). In terms of achieving lower losses, the mean difference in N lost as NH3was in favour of the lower stocking rate (3 AU ha‐1), estimated at 1 051 ± 324 g NH3ha‐1(P≤0.05). A consistent pattern of NH3loss was shown to occur during the season, with higher losses being recorded during the day time and lower losses at night.
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