Original Articles

A preliminary report on the effect of acacia karroo competition on the composition and yield of sweet grassveld


Abstract

In a large‐scale experiment a dense stand of A. karroo was effectively killed by a basal bark application of 2,4,5—T at a concentration of 1.5 per cent acid equivalent in paraffin. There was no correlation between density of Acacia and either composition or basal cover of the grass component. After three years there was still no significant difference in the grass cover and composition of paddocks on which A. karroo had been cleared, and uncleared ungrazed control paddocks. There was no evidence that where grazing was precluded a dense stand of A. karroo would develop and retard improvement in botanical composition. Despite the similarity in cover and composition, uncleared paddocks yielded significantly less grass than cleared paddocks, both in dry and in wet seasons. Total costs of bush clearing averaged R6.80 per morgen.

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