Comparison of The Rehabilitative Effects of Mechanical And Chemical Methods of Bush Control on Degraded Highland And Savanna Rangelands in Namibia

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ABSTRACT

The study was carried out at Spes Bona 207 farm in Hochfeld district, and Neudamm 63 farm in the Khomas Hochland district, Highland savanna in Namibia. The objective of this study was to investigate the rehabilitative effects of mechanical and chemical methods of bush control of an invasive bush species Acacia mellifera for achieving long term rehabilitation of degraded highland savanna rangelands in Namibia. At farm Spes Bona, three belt transects (50 x 5m2 ) were laid in chemical treatments and another three belt transects (50 x 5m2 ) were laid in mechanical treatments. Moreover, the same method was used in the control experiment. At Neudamm farm, a 200 x 100m2 plot with 495 Acacia mellifera treated stumps were divided into 3 sub-plots for each treatment (mechanical, chemical and control). Each sub-plot was further divided into 3 replicates. In each replicate, stumps were randomly assigned key-tags with sequential numbers from 1-55 per sub-plot, for assessment purpose. At Spes Bona farm, the grass tuft density of species Aristida congesta, Cenchrus ciliaris, Chloris vigata, Eragrostis rigidior, Eragrostis viscosa, Melinis repens and Melinis villosum was significantly higher (P

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