Browsing by Author "Mtey, Grasiana Manyara"

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Comparative study on the performance of soybean dehulling methods in Morogoro Region
(Sokoine University of Agriculture, 2009) Mtey, Grasiana Manyara
A study was conducted to assess soybean dehulling methods used in Morogoro region at village level and in peri-urban areas. Methods identified were: hand method (53.5%), hessian bag method (31.0%), mortar and pestle (9.9%), grinding stone (1.4%), and SUA wet dehuller (4.2%). Dehulling processes used were wet processing (91.53%) and dry processing (8.5%). Hand, hessian bag and SUA wet dehuller, were tested in a laboratory for dehulling efficiency on TGX1895-33F, TGX1895-4F, TGX1805-8E, TGX 1876-4E and sable varieties. Dehulling efficiency was measured by dehulling fractions and parameters produced in each method. Dehulling fractions in wet dehuller were; bean recovery (90.39%), hull recovered (8.85%), undehulled grains (1.26%) and fines (1.56%), while dehulling parameters were; coefficient of dehulling (0.98), coefficient of the wholeness of the kernels (0.97), hulling efficiency (95.99%), overall dehulling efficiency (95.59%), and dehulling index (0.94). However, the SUA wet dehuller proved unsuitable for dry Deans. Hand method showed bean recovery of 88.18% where hull recovered was 8.43%, undehulled grains 1.35%, fines 1.19%, coefficient of dehulling 0.98, coefficient of the wholeness of the kernels 0.98, hulling efficiency 96.33%, overall dehulling efficiency 92.84%, and dehulling index 0.91. Hessian bag method showed slightly lower dehulled fractions and parameters which included bean recovery of 79.75%, hull recovered 8.32%, undehulled grains 2.62%, fines 4.87%, coefficient of dehulling 0.96, coefficient of the wholeness of the kernels 0.93, hulling efficiency 90.93%, overall dehulling efficiency 82.33% and dehulling index 0.77. Relative throughputs were 30, 2.27 and 1.38 kg/hr for dehuller, hessian bag and hand method respectively. Physical characteristics of the bean varieties significantly (p<0.05) influenced dehulling efficiency. Traditional method of processing used by 95.8% of households was the most popular in comparison to SUA wetiii dehuller 4.2%. The dehuller was found to be a useful method for lessening the dependence on traditional methods, reduce the drudgery and reducing dehulling time.