EFFECT OF ACACIA XANTHOPHLOEA LEACHATES ON SEED GERMINATION OF SOME AGRICULTURAL AND MULTI- PURPOSE TREE CROPS

NSOLOMO, V. R., MRECHA, M.S. & MAGHEMBE, J. A. 1995. Effect of Acacia xanthophloea leachates on seed germination of some agricultural and multipurpose tree crops. Laboratory and nursery studies were carried out to determine the effect of water leachates of Acacia xanthophloea on the germination of some agricultural and leguminous tree crops to determine compatibility for intercropping in agroforestry systems. Leachates from leaves, bark and litter were applied on seeds of Zea mays (maize), Eleusine coracana (finger millet), Vigna radiata (green gram), Albizia lebbeck , Leucaena leucocephala. and Acacia xanthophloea. The germination of the agricultural crops and of two tree species, Albizia lebbeck and Acacia xanthophloea, was not inhibited by the leachates both in the laboratory and nursery. However, the germination of L. leucocephala was significantly inhibited by the bark and litter leachates in the laboratory, but not in sand culture in the nursery. The inhibition effect of the leachates on root and shoot elongation for all the test species was also not significant. From this study it appears unlikely that Acacia xanthophloea produces potentially allelopathic substances and hence it is suggested that A. xanthophloea could be successfully intercropped in agroforestry systems with a diverse range of agricultural and tree species in well drained and aerated soils. Keywords: Acacia xanthophloea -allelopathy -tree and agricultural crops -agroforestry NSOLOMO, V.R., MRECHA, M.S. MAGHEMBE, J.A. 1995. Kesan pelarutresap Acacia xanthophloea kepada percambahan biji benih tanaman pertanian dan tanaman pelbagai guna. Kajian makmal dan tapak semaian dijalankan untuk menentukan kesan pelarutresap Acacia xanthoploea pada percambahan beberapa tanaman pertanian dan kekacang untuk menentukan kesesuaian bagi penanaman selingan dalam sistem hutan tani. Pelarutresap dari daun, kulit dan sarap telah di bubuh pada biji benih Zea mays (jagung), Eleusine coracana (finger millet), Vigna radiata (green gram), Albizia lebbeck, Leucaena leucocephala dan Acacia xanthophloea. Percambahan tanaman pertanian dan dua spesies pokok iaitu Albizia lebbeck dan Acacia xanthophloea tidak terencat oleh pelarutresap dalam makmal atau di tapak semaian. Bagaimanapun, percambahan L. leucocephala terencat dengan ketara oleh pelarutresap kulit dan sarap di makmal, tetapi tidak pula di dalam kultur pasir di tapak semaian. Kesan rencatan pelarutresap pada akar dan pemanjangan pucuk bagi kesemua spesies yang diuji juga tidak ketara. Kajian ini menunjukkan bahawa Acacia xanthophloea tidak berpotensi untuk mengeluarkan bahan-bahan alelopati. Oleh sebab itu, dicadangkan bahawa Acacia xanthophloea boleh dijadikan tanaman selingan yang berjaya di sistem agrotani yang mempunyai pelbagai spesies pertanian dan pokok di tanih yang berudara dan mempunyai saliran yang baik

Growth performance of azadirachta Indica provenances in Morogoro, Tanzania

Journal of Tropical Forest Science, 2004; 16(3): 328-335The growth performance of 20 provenances and one land race of Azadirachta indica (neem) from 10 countries was evaluated at Mkundi Fuel Wood Forest Reserve in Morogoro region, Tanzania. The experiment was established in a randomised complete block design with six replications. This is one of the provenance trials under the International Neem Network. The assessment involved tree height, diameter at breast height, number of branches, stem quality, survival and total volume after 58 months of planting. Except for survival, differences between provenances as well as between provenance and land race were observed in all the parameters studied. Provenances Ban Bo, Ban Nong (Thailand), Ghaati (India), Doi Tao (Thailand), Ramanaguda (India), Vietianne (Vietnam), Kuliyapitiya (Sri Lanka), Annur, Mandore, Chitradunga (India) and Bandia (Senegal) were the best performers. Yezin (Myanmar), Allhabad (India), Balharshalt (Nepal), Sunyan (Ghana), Lamahal, Geta (Nepal), Chamwino (Tanzania), Chanatorin (India), Muttan, Tibbi Laran (Pakistan) were marginal performers. It is recommended that further assessments on provenance performance be carried out up to half rotation age for identification of promising provenance

Growth performance of azadirachta Indica provenances in Morogoro, Tanzania

Journal of Tropical Forest Science, 2004; 16(3): 328-335The growth performance of 20 provenances and one land race of Azadirachta indica (neem) from 10 countries was evaluated at Mkundi Fuel Wood Forest Reserve in Morogoro region, Tanzania. The experiment was established in a randomised complete block design with six replications. This is one of the provenance trials under the International Neem Network. The assessment involved tree height, diameter at breast height, number of branches, stem quality, survival and total volume after 58 months of planting. Except for survival, differences between provenances as well as between provenance and land race were observed in all the parameters studied. Provenances Ban Bo, Ban Nong (Thailand), Ghaati (India), Doi Tao (Thailand), Ramanaguda (India), Vietianne (Vietnam), Kuliyapitiya (Sri Lanka), Annur, Mandore, Chitradunga (India) and Bandia (Senegal) were the best performers. Yezin (Myanmar), Allhabad (India), Balharshalt (Nepal), Sunyan (Ghana), Lamahal, Geta (Nepal), Chamwino (Tanzania), Chanatorin (India), Muttan, Tibbi Laran (Pakistan) were marginal performers. It is recommended that further assessments on provenance performance be carried out up to half rotation age for identification of promising provenance