Browsing by Author "Amri, E."

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    Effect of Timing of Seed Collection and Provenance on Seed Viability and Germination of Dalbergia melanoxylon
    (Scientific Research, 2008) Amri, E.; Lyaruu, H. M. V.; Nyomora, Agnes M.; Kanyeka, Z. L.
    Dalbergia melanoxylon is one of the most expensive timbers in the world used for the manufacturing of musical instruments and decorative objects such as carvings. The effect of timing of seed collection and provenance on seed viability and germination were investigated. Percentages of germination capacity and germination energy were significantly higher for seeds collected 12 and 16 weeks after maturity. Seed viability was highest 59.8% at fruit maturity stage and significantly decreased to 25.7% for seeds collected 24 weeks after maturity. Significantly highest germination capacity 25.8% was obtained for seeds collected from Ubena provenance followed 20.5% for seeds collected from Mkundi provenance. Percentage of seed viability collected from Ubena was superior 57.56% to other provenances followed Mkundi provenance, which had 49.42%. Seed collection in D. melanoxylon should be done between 8-16 weeks after maturity from superior provenances to obtain seeds with high germination energy and germination capacity.
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    Evaluation of Genetic Diversity in Dalbergia Melanoxylon Populations Using Random
    (2009) Amri, E.; Kanyeka, Z. L.; Lyaruu, H. M. V.; Nyomora, Agnes M. S.
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    Evaluation of Provenances and Rooting Media for Rooting Ability of African Blackwood (Dalbergia Melanoxylon Guill. & Perr.) Stem Cuttings
    (2009) Amri, E.; Lyaruu, H. M. V.; Nyomora, Agnes M. S.; Kanyeka, Z. L.
    Vegetative propagation of Dalbergia melanoxylon Guill. & Perr. collected from six provenances was investigated in three rooting media (river sand, forest topsoil and mixture 1: 1 (v/v) of river sand and forest topsoil). The effect of provenance and rooting media were highly Significant (p<0.001) for the percentage rooted stem cuttings. Interactive effect on provenance and rooting media was not significant in all rooting parameters evaluated. The highest and lowest rooting percentages with respect to provenance were 22.7% and 12.4% recorded from Madale and Mikumi respectively. River sand media revealed significant highest rooting ability of cuttings in all rooting parameters among the three media tested (p<0.05). Significant positive correlation (p<0.01) was revealed between rooting parameters while rooting and sprouting parameters were negatively correlated. Vegetative propagation of D. melanoxylon is a means for promotion of this species for domestication, conservation and as an asset for clonal forestry.