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Sokoine University of Agriculture  Institutional Repository (SUA IR). This repository was built and is maintained by the university library  (Sokoine National Agricultural Library-SNAL) , in order to collect, preserve and disseminate scholarly output generated by University research community (staff and students) members.

This repository hosts a variety of openly accessible materials including: scholarly articles and books, theses and dissertations, conference proceedings and technical reports. For assistance about depositing your research output in the repository click here. SUA IR Policy  click here or any queries contact us at snal@sua.ac.tz.

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Now showing 1 - 5 of 14

Recent Submissions

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Economic potential of selected lesser known and underutilized indigenous agroforestry timber species in Kilosa District in Tanzania
(Sokoine University of Agriculture, 2015) Mvanda, Godliva Angelus
The main objective of this study was to determine the economic potential of Lesser Known (LK) indigenous agroforcstry timber tree species mainly Lonchocarpus capassa, Lannen schhnperi, Combrelum adenogonium, Psendolanchnostylis maprouneifolia and Vitex keniensis. Specifically the study aimed al estimating the standing volume of the LK Indigenous Agroforcstry Timber Species (1AGTS) in farms, determine their economic value and estimate their profitability for timber production. Structured and semi structured questionnaires, personal observation, focused group discussion and forest inventory methods were used in data collection. One hundred and twenty households in four villages were sampled purposively. The data was analyzed using the Statistical Package for Sosial Sciences (SPSS) programme version 16 and Microsoft Excel programme. Descriptive analysis was used to generate frequencies, percentages, sums and means which were used to discuss the results. Findings indicated that a total of 7247 trees with volume of 1114.3 m3 were obtained in conserved as Lesser Known IAGTS and hardwood woodlots respectively. The economic value for conserved LK IAGTS and planted hardwood woodlots per household was 328 900 TZS and 3 180 000 TZS respectively. Profitability' at 10% discounting factor, NPV were TZS 4 892 453 and TZS 6 161 247, at 22 and 19 years rotation ages for LK IAGTS practices and hardwood woodlots respectively. Obtained standing volume, total value and average annual income of LK IAGTS in conserved trees and woodlots increases additional income and serves as off farm income to households hence improves livelihoods as well as reducing dependence on the reserved forests. I therefore recommend optimizing production of IAGTS in woodlot at households’ level; hence will improve the conservation of the resources with positive socio-economic implication to farmers.
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Spatial and temporal distribution of cassava green mite, mononychellus tanajoa bonder (acarina: tetranychidae) in Tanzania
(Archives of Current Research International, 2017-07-25) Wudil, B. S; Rwegasira, G. M; Kudra, A. B; Jeremiah, S
Two diagnostic surveys were conducted during the 2015 and 2016 growing seasons in three major cassava growing zones of Tanzania. The studies aimed at establishing the spatial and temporal distribution of M. tanajoa on commonly grown commercial cassava varieties landraces across seasons in Tanzania. A total of 2,700 plants in 90 fields were assessed in nine districts of which five fields were in the Lake zone and two districts in each of the Southern and Eastern zones. Results indicated that the distribution of M. tanajoa significantly (P = .05) differed across seasons, Southern and Lake zones were statistically similar and higher in M. tanajoa population than the Eastern zone. Crop age, altitude and cassava varieties significantly (P = .05) influenced the population of M. tanajoa while crop mixture (inter cropping) had no significant effect in both seasons. The relationship among the environmental variables and population distribution of M. tanajoa were significant (P = .05). Variations in M. tanajoa population within and between seasons and locations were due to differences in the cassava varieties and the environment. The survival, perpetuation and distribution of M. tanajoa were attributed to the crop age, suitability of the variety and intensity of cassava cultivation.
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Inventory of dalbergia melanoxylon (mpingo) in the Southern part of Tanzania: the case of Nachingwea
(2002-03) Opulukwa, Meshack J.; Hamza, K. F. S; Malende, Y. H. M. B.
The study was designed to assess the current status of Dalbergia melanoxylon (Mpingo) in Tanzania. A total of 44 sample plots (3.08 ha) were laid on public land. D. melanoxylon contributes about 4% of all total stems out of 103 tree species identified and most of them found in clusters. Out of all visited plots 36.4% had D. melanoxylon. Parameters determined include height, stems per hectare, basal area per hectare, volume per hectare and diameter class of trees. The number of stems, basal area and volume per hectare was found to be 20, 1.2m2 and 8.6m3 respectively. The stems were distributed in five diameter classes. Based on the importance of D. melanoxylon for the economy of Tanzania, it is recom- mended that national inventory for the species should be carried out in order to know the existing stock and to prescribe sustainable harvesting regimes. Licensing for logging D. melanoxylon should be based on estimates of the yield and not on the existing demand.
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Assessment of the soil suitability for soybean growth and the prospect biofertilizers use in selected areas of Tanzania
(School of Life Science and Bioengineering (LiSBE), 2023-10-19) Nakei, Monica; Venkataramana, Pavithravani B.; Ndakidemi, Patrick A.
The rapidly increasing global human population threatens the availability of safe and nutritious food. Among others, soil fertility degradation, insufficient use of proper fertilizers and scanty soil characterizations have major contributions in lowering the productivity of crops. To ensure the use of sufficient proper fertilizers for optimum crop productivity, it is important to evaluate the fertility status of soil which is a vital tool in deciding the type and the amount of fertilizer to be supplemented. This study aimed at evaluating soil fertility in the soybean growing and the non growing areas of Tanzania and to assess their suitability for growing the soybean crop as well as prospective use of rhizobia biofertilizers through the assessment of nodule formation in non-inoculated soybean plants grown in different farmers' fields. A total of 81 soil samples including those in soybean growing and non growing areas of Tanzania, were evaluated in terms of their fertility status through different physico- chemical parameters. From each field, three healthy plants with intense green leaves were selected for nodule counting. The study indicated that, most of the soils (85%) have medium acidic to neutral soil pH with 58% having sufficient organic carbon and 78% at risk of nitrogen deficiency. Soil pH, total N and OC had significant (p < 0.05) correlations (r) of 0.14, −0.22 and −0.27 with nodule number. The higher number of nodules were in medium acidic to neutral soils, with the highest number, 8.82 in neutral pH soils, indicating the favorability of the particular pH ranges for rhizobia activities. The results of this study suggest that most of the soils are suitable for the production of soybean and the use of rhizobia inoculants.
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Socio-economic and field performance evaluation of different rice varieties under system of rice intensification in Morogoro Tanzania
(2018-08-10) Kangile, R. J; Ng’elenge, H. S; Busindeli, I. M
Worldwide, many Studies on the System of Rice Intensification (SRI) indicate that, the practice has promising results on increased rice productivity especially with high-yielding varieties. Therefore, it was necessary to validate the system at smallholder farmers’ level under Tanzanian condition. The study sought to evaluate the performance of selected rice improved varieties under SRI in different fields and locations in Morogoro region through an action research. Four rice varieties were planted in Completely Randomized Block Design (CRBD) experimental fields at the spacing of 25cm x 25cm transplanted at 10 days after emergence. Experimental fields were set in three locations. The evaluation was followed by socio-economic participatory variety selection (pairwise and matrix scoring methods) which involved 36 farmers from all the three locations. It included both consumption (aroma, panicle size, grain weight, milling quality, cookability and palatability) and production traits (Yield, threshability, lodging, maturity, plant height, shuttering, disease tolerance and drought tolerance) of rice varieties. A statistical Package for Social Science computer software (SPSS) and Genestat were used in data analysis. Field results based on production trait (yield) indicated TXD 88 to have the highest yield (9.13t/ha). Other yield levels were 8.7t/ha, 8.4t/ha and 6.2t/ha for TXD 307, TXD 306 and Supa respectively. Yield was significantly influenced by number of productive tillers (P<0.05). Participatory Variety Selection results with consideration of both production and consumption traits highlighted TXD 306 to be suitable for farmers. We recommend the use of improved rice varieties under SRI. The dissemination efforts need to foster on the extensive promotion of TXD 306 since it serves the dual purposes by having competitive production and consumption traits under SRI production system. Breeding programs need to also embark on improving TXD 88 removing its chalkiness.