Influence of quality attributes on the market value of fresh sweet potato tubers and processed cassava.
| dc.contributor.author | Ndunguru,Gabriel t. | |
| dc.date.accessioned | 2024-07-31T05:22:32Z | |
| dc.date.available | 2024-07-31T05:22:32Z | |
| dc.date.issued | 2001 | |
| dc.description | PhD theses | |
| dc.description.abstract | Cassava (Manihot esculenta Crantz} roots and sweet potato (Ipomoea batatas (L) Lam) tubers are important staple food crops in several areas of Tanzania. Studies were conducted in Mwanza and Dar es Salaam markets in order to assess the factors that influence the quality and market value relationship of fresh sweet potato tubers and processed cassava roots. Consumers and traders in Mwanza preferred sweet potato tubers which are wholesome and free from infestation. White processed cassava root products were preferred by traders and consumers in Mwanza. Valuation assessment made on sweet potatoes showed that, broken, cut and weevil infested tubers sold were at 12.1, 14.2 and 36.6 percent discount respectively. Average valuation discount of processed cassava roots were 10 to 15 for yellow, 20 to 25 for greenish and 35 to 40 percent for dark product. Causes of losses in quality of sweet potato tubers were due to operations related to handling and transportation. Occurrence of broken tubers, skinning injury and cuts increased significantly with handling and transportation (P < 0.001). The largest loss in quality occurred between the lakeshore and the port at Mwanza when sacks were loaded and unloaded from the ship and handled at the port.iii Broken sweet potato tubers and skinning injury increased significantly ( P < 0.001) during handling and transportation from Gairo to Da es Salaam Impact shock loggers provided a low cost method for comparing the handling of sacks during transportation. Shock impact record increased with increase in the height form which sweet potato sacks were dropped (R2 adjusted = 0.875). Multiple linear regression analysis indicated that the number of impact in the category between 0.2 and 2 g significantly correlated with skinning injury (P=0.001), (R2 adjusted =0.651) and broken tubers (P=0.001), (R2 adjusted = 0.407) respectively. Weight loss during storage increased significantly (P=0.01) with shock impact and skinning injury. Dropping sacks of sweet potato tubers significantly (P < 0.01) increased the occurrence of broken tubers The use of cardboard boxes filled with fewer tubers instead of overfilled polypropylene sacks and adoption of improved management procedures in the handling and transport are recommended. | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/123456789/6338 | |
| dc.language.iso | en | |
| dc.publisher | Sokoine University of Agriculture | |
| dc.subject | Cassava | |
| dc.subject | Sweet potato | |
| dc.subject | Food crops | |
| dc.subject | Market | |
| dc.title | Influence of quality attributes on the market value of fresh sweet potato tubers and processed cassava. | |
| dc.type | Thesis |