Browsing by Author "Komanya, Absalom"

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    Assessment of Current Post-Harvest Handling Techniques for Mango and Avocado in Mbeya Region, Tanzania: Challenges and Opportunities for Improvement
    (Elsevier, 2025-07-31) Mng’ong’o, Marco E.; Matimbwa, Hadija; Komanya, Absalom; Maro, Lilian; Mshora Abubakar M
    Mango (Mangifera indica) and avocado (Persea americana) are valuable fruits in Tanzania, known for their nutritional and economic importance. However, their perishability leads to significant post-harvest losses, especially for smallholder farmers in Mbeya. The limited knowledge about post-harvest handling identifies a research gap. This study assessed practices and challenges among mango and avocado farmers to improve handling techniques. A survey of 150 smallholder farmers in Kyela and Rungwe districts (August–September 2024) examined harvesting, storage, transportation, and post-harvest challenges. Data analysis revealed that 64 % of farmers use traditional harvesting methods that lead to mechanical damage. While 68.8 % manually hand-harvest, others rely on tree shaking (8.3 %) and sticks or stones (18.8 %), further increasing fruit damage. Storage at ambient temperature (46 %) fails to extend shelf-life, causing rapid quality deterioration. Trans portation by motorcycle (44 %) and head carrying (34 %) exposes fruits to damage. Key challenges included fruit drop (36 %), rotting before harvest (28 %), and insect infestation (24 %). Only 23.4 % of farmers had reliable market access, highlighting a major constraint. Education level influenced challenges, with lower-educated farmers facing more rotting and pest issues. Findings indicate current post-harvest practices are inadequate, leading to major losses. Simple, cost-effective technologies like edible coatings and training on improved har vesting, storage, and transportation are necessary. Investment in affordable cold storage and better transport infrastructure is crucial. This study provides actionable insights for policymakers and stakeholders to enhance mango and avocado value chains in Tanzania
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    Assessment of Current Post-Harvest Handling Techniques for Mango and Avocado in Mbeya Region, Tanzania: Challenges and Opportunities for Improvement
    (Elsevier, 2025-07-31) Mng’ong’o, Marco E.; Matimbwa, Hadija; Komanya, Absalom; Maro, Lilian; Mshora, Abubakar M.
    Mango (Mangifera indica) and avocado (Persea americana) are valuable fruits in Tanzania, known for their nutritional and economic importance. However, their perishability leads to significant post-harvest losses, especially for smallholder farmers in Mbeya. The limited knowledge about post-harvest handling identifies a research gap. This study assessed practices and challenges among mango and avocado farmers to improve handling techniques. A survey of 150 smallholder farmers in Kyela and Rungwe districts (August–September 2024) examined harvesting, storage, transportation, and post-harvest challenges. Data analysis revealed that 64 % of farmers use traditional harvesting methods that lead to mechanical damage. While 68.8 % manually hand-harvest, others rely on tree shaking (8.3 %) and sticks or stones (18.8 %), further increasing fruit damage. Storage at ambient temperature (46 %) fails to extend shelf-life, causing rapid quality deterioration. Trans portation by motorcycle (44 %) and head carrying (34 %) exposes fruits to damage. Key challenges included fruit drop (36 %), rotting before harvest (28 %), and insect infestation (24 %). Only 23.4 % of farmers had reliable market access, highlighting a major constraint. Education level influenced challenges, with lower-educated farmers facing more rotting and pest issues. Findings indicate current post-harvest practices are inadequate, leading to major losses. Simple, cost-effective technologies like edible coatings and training on improved har vesting, storage, and transportation are necessary. Investment in affordable cold storage and better transport infrastructure is crucial. This study provides actionable insights for policymakers and stakeholders to enhance mango and avocado value chains in Tanzania
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    Bio-Concentration and Translocation of Chromium in Soil-Plant System: Health Risks in Usangu Agro-Ecosystem
    (ELSEVIER, 2023) Mng’ong’o, Marco E.; Mshora, Abubakar M.; Msigwa, Christopher; Komanya, Absalom; Shimo, Samwel
    Determination and analysis of total chromium (Cr) in soil and plant tissues help estimate the associated health risk; however, this might overestimate the risk because not all Cr from the soil is transported to above-ground plant tissues, mainly the edible part of most plants. Here we present the analysis of Cr partition in soils and paddy rice plant samples which currently missing in Usangu agro-ecosystem. The bio-concentration (BF) and translocation factors (TF) estimating the distribution and partitions of Cr in plant tissues (roots, straws, and grains), and associated environmentally and health risks were determined in Usangu agro-ecosystem. The Cr concentration in soils ranged from 4.58 to 42.76 mg/kg which was within maximum permissible limits (100 mg/ kg), with the total Cr in plants samples ranging from 12.88 to 57.34 mg/kg. It was found that straws and roots had higher Cr concentrations than grains indicating a less health risk in edible parts. The BF > 1 was observed in 83.3% of the studied sites indicating higher Cr uptakes by plants. Furthermore, TF < 1 was observed in 67.33% of the studied sites indicating more Cr accumulated in below-ground biomass (roots) than above-ground biomass (straws and grains) (33.33%), thus less risk to edible plant parts. This study indicates that high Cr in agricultural soils may accelerate Cr accumulation in plant tissues or above-ground plant biomass leading to health risks.