University of Khartoum

Effect of Type, Time of Tapping and Tree Size of Acacia seyal var. seyal on the Production of Gum Talha in Rawashda Forest, Gedarif State, Sudan

Effect of Type, Time of Tapping and Tree Size of Acacia seyal var. seyal on the Production of Gum Talha in Rawashda Forest, Gedarif State, Sudan

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Title: Effect of Type, Time of Tapping and Tree Size of Acacia seyal var. seyal on the Production of Gum Talha in Rawashda Forest, Gedarif State, Sudan
Author: Ahmed, Mahassin
Abstract: This study investigated the effect of methods and time of tapping and tree size on the gum production from A. seyal. Three areas were selected in Rwashda Forest (Gedarif State) to represent trees of three diameter classes, namely, small (DBH 4-7cm), medium (DBH 7.1-14cm) and large (DBH 14.1-24cm). Five tapping methods (bark removal, vertical injury of the bark, horizontal injury of the bark, barks hammering and control) had been applied on 15 randomly selected trees from each tree size. These treatments were repeated monthly during the period November 2004 to April 2005. The results revealed that A. seyal trees responded only to bark hammering. The small trees responded to tapping in December and the large trees in February and March. Medium size trees showed no response to any of the treatments during the study period. Average weight of gum produced per a small tree was 14.8 g. Results of the regression analysis showed that no significant relationship between gum weight and tree DBH. Estimated average weight of gum produced per feddan is 15.56 kg. The average gum weight produced by a large tree was 45 g. No significant differences were found in the weight of gum produced by the large size trees taped in February and those taped in March. Expected average weight of gum produced per feddan is 7.5 kg. Estimated weight of gum produced annually by tapping small and large trees in Rwashda Forest is 127 ton, and in Gedarif State is 183 ton compared to 0-2 ton in the years 2002-2005 produced by natural exudation.
URI: http://khartoumspace.uofk.edu/handle/123456789/9255
Date: 2015-04-21


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