The effect of defoliation during wilting on the production ofThemeda triandraandEragrostis lehmannianain semi‐arid grassland
作者:
H.A. Snyman,
期刊:
African Journal of Range & Forage Science
(Taylor Available online 1993)
卷期:
Volume 10,
issue 3
页码: 113-117
ISSN:1022-0119
年代: 1993
DOI:10.1080/10220119.1993.9638336
出版商: Taylor & Francis Group
关键词: Drought;soil‐water content;temporary wilting point;Themeda‐Cymbopogonveld
数据来源: Taylor
摘要:
The effect of defoliation during wilting on the production ofThemeda triandraandEragrostis lehmannianawas studied over four years (1977 to 1980). Defoliation whilst the plants were at temporary wilting point in the early growing season (before 1 January) decreased production from both species in the subsequent season (P≤0.01). Defoliation over the last half of the growing season, during wilting, had little effect on growth in the following season (P≤0.05). The effect of a defoliation treatment on production was not necessarily neutralised after one season's rest.Themeda triandraproduced more (P≤0.01) thanE. lehmannianafor each defoliation. The seasonal soil‐water extraction pattern in the soil profile was also determined. As the season progressed, plants showed visible signs of wilting at lower soil‐water content than earlier in the season. Most water extraction over the season takes place to a soil depth of 600 mm.
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