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Articles by J.P. Tetteh
Total Records ( 3 ) for J.P. Tetteh
  E. Asare-Bediako , Y. Opoku-Asiama , F.A. Showemimo and J.P. Tetteh
  Different methods of sterilizing sprouting media for the control of rot in minisetts of Dioscorea rotundata var Pona and Dente were evaluated. Sawdust and topsoil sprouting media were sterilized by roasting, solarization and fumigation in a completely randomized block design replicated thrice in the laboratory. Significantly higher percentage rot was recorded for minisetts planted in unsterilized sprouting media than those in sterilized media. Incidence of minisett rot was, however, higher in unsterilized topsoil than in unsterilized sawdust. Roasting was most effective in sterilizing the sprouting media, followed by fumigation and the least was solarization. There was no significant difference between the effects of sterilized sawdust and topsoil on rotting and sprouting of yam minisetts. Pona minisetts planted in sterilized medium produced higher percentage sprouting and lower percentage rotting as compared with that of Dente minisetts.
  E.E. Abano , E. Teye , R.S. Amoah and J.P. Tetteh
  In this study, evaporative cooling barn was designed, constructed and tested using two varieties of sweet potato. The mean dry bulb temperature and relative humidity of the inside and outside air stream were 25°C and 90% and 31.5°C and 67.5%, respectively. The systems cooling efficiency was determined to be 127%. A test on the evaporative cooling barn using 18 mini sacks, each containing 14 tuberous roots with four replications for 12 weeks, revealed that moisture loss from the two varieties are approximately the same (13%). The moisture content of the root tubers decreased linearly from 68 to 59% and 60 to 52% (wb) over a storage time for TIS 2 and Ukerewe, respectively. Percentage weight loss increased linearly from 0 to 11.4 and 0 to 11.9% for TIS 2 and Ukerewe, respectively. The percentage wholesomeness decreased linearly with storage time from 100 to 76% and 100 to 60% for TIS 2 and Ukerewe, respectively. Percentage weevil damage increased non-linearly with storage time and started 6 and 10 weeks in storage for Ukerewe and TIS 2, respectively; percentage sprouting increased non-linearly with storage time and started 4 and 6 weeks for TIS 2 and Ukerewe, respectively. Percentage shrinkage increased linearly with increasing storage time from 0 to 3.6% and 0 to 4.6% for TIS 2 and Ukerewe, respectively. Percentage decay increased linearly with increasing storage time from 0 to 29% and 0 to 76% for TIS 2 and Ukerewe, respectively.
  R.S. Amoah , E. Teye , E.E. Abano and J.P. Tetteh
  The storage of sweet potato tuberous roots in tropical countries is a major challenge to farmers and retailers due to unfavourable climatic conditions. In this research the storage performance of sweet potato roots in an evaporative cooling barn was investigated with three different pre-storage treatments - ash, brine and Lantana camara extract to evaluate their effects on weight loss, shrinkage, weevil damage, sprouting and decay over 12 weeks duration. The control comprised roots with no pre-treatment. Weight loss increased linearly from the inception of storage whilst shrinkage became apparent only after 2 weeks and rose linearly. The roots were held against weevil damage until the 6th week. Sprouting was initiated after 4 weeks of storage. By the 12th week, the Lantana camara treatment yielded better results, recording overall root wholesomeness of 76%, followed by the control (56%), the ash treatment (50%) and the brine treatment (48%). The Lantana camara treatment also recorded the lowest weight loss of 28%, lowest shrinkage of 3.8%, lowest severity of decay and sustained less weevil damage at 47.5% compared with the other treatments. Sprouting was however, higher than the other treatments. The brine and ash treatments performed poorest with the performance indicators.
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