Effect of Regeneration Methods and Weeding Treatments on Establishment of Acacia senegal (L.) Willd. on Clay Soils

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Hussein,Salaheldin G.
Sulieman, Hussein M.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
This study was carried out at Elrawashda forest, Gedaref State, eastern Sudan, during the period May 1997- June 1998, to investigate artificial regeneration of Acacia senegal (L.) Willd., under rainfed conditions, on clay soils. The experimental design was 4x4 split-plot factorial with three replications; four regeneration methods were tested in the main plots, namely i) regeneration with nursery stock seedlings, ii) regeneration with pit sowing, iii) regeneration with line sowing, and iv) regeneration with broadcasting. The subplots contained the four weeding treatments, i.e., i) four complete weedings, ii) three complete weedings, iii) four line weedings, and iv) three line weedings. The main growth parameters measured were shoot height (cm), diameter at shoot base (cm) and survival percentage. Significant differences were obtained for shoot height, shoot base diameter and survival percentage for the different treatments. In the final assessment, nursery stock seedlings and line sowing gave the greatest survival percentages (78.8 and 77.1%, respectively), while broadcasting gave medium survival percentage (67.0%). Pit sowing gave the least survival percentage (37.5%). It is recommended that line sowing with three weedings be adopted for establishment of Acacia senegal in large -scale plantations on clay soils.
Page(s): 7 (2), 61-69,9 Ref