AI SearchEffects of post-harvest handling systems on rice quality : a case study of Thanhhoa province, Vietnam
Call Number: AIT Thesis no.AE-95-14 Material type:
TextSeries: Asian Institute of Technology. Thesis ; no. AE-95-14Publication details: Bangkok : Asian Institute of Technology, 1995Description: 87 leaves + 1 online resourceSubject(s): Online resources: Dissertation note: Thesis (M.Eng.) - Asian Institute of Technology, 1995 Summary: The on-farm post-harvest handling systems and their effects on the rice milling quality were studied in the Thanhhoa province of Vietnam. This study was made to estimate the rice milling quality losses caused by different post-production operation and systems and to recommend appropriate systems and measures to reduce the on-farm quality losses. The results of survey conducted for 45 farm households show that there are three major rice post-production system existing in the province. Among the operations, only two operations of threshing and milling are partially or fully mechanized, while other operations still employ the traditional practices like harvesting paddy by sickle, drying by sunlight on paved yard and storage of paddy in wooden bin or clay jar. The post-harvest experiments were implemented for all operations from threshing to milling to quantify their impacts on rice milling quality characteristics such as milling and head rice recovery, percentage of damaged and discolored grains. Results of the experiments indicate that milling operation induces the greatest loss in milling quality. For instance, the milling operation causes 2.5% to 7.5% loss in milling recovery and 16% to 30% loss in head rice yield, while all pre-milling operations cause insignificant loss in milling recovery and 2.5% to 13% loss in whole kernel recovery. The economic analysis of alternative rice post-production systems was carried out to select the most economically suitable systems. Based on the calculated cost-benefit ratios of three different systems, it was recommended that for the farm size less than 1 ha and labor cost less than 1.5 US$/man-day, the two post-harvest handling systems consisting of harvesting by sickle, threshing by pedal drum thresher or motored axial-flow thresher and drying by sunlight on paved yard are the most adaptable systems for the Thanhhoa province.
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A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering
Thesis (M.Eng.) - Asian Institute of Technology, 1995
The on-farm post-harvest handling systems and their effects on the rice milling quality were studied in the Thanhhoa province of Vietnam. This study was made to estimate the rice milling quality losses caused by different post-production operation and systems and to recommend appropriate systems and measures to reduce the on-farm quality losses. The results of survey conducted for 45 farm households show that there are three major rice post-production system existing in the province. Among the operations, only two operations of threshing and milling are partially or fully mechanized, while other operations still employ the traditional practices like harvesting paddy by sickle, drying by sunlight on paved yard and storage of paddy in wooden bin or clay jar. The post-harvest experiments were implemented for all operations from threshing to milling to quantify their impacts on rice milling quality characteristics such as milling and head rice recovery, percentage of damaged and discolored grains. Results of the experiments indicate that milling operation induces the greatest loss in milling quality. For instance, the milling operation causes 2.5% to 7.5% loss in milling recovery and 16% to 30% loss in head rice yield, while all pre-milling operations cause insignificant loss in milling recovery and 2.5% to 13% loss in whole kernel recovery. The economic analysis of alternative rice post-production systems was carried out to select the most economically suitable systems. Based on the calculated cost-benefit ratios of three different systems, it was recommended that for the farm size less than 1 ha and labor cost less than 1.5 US$/man-day, the two post-harvest handling systems consisting of harvesting by sickle, threshing by pedal drum thresher or motored axial-flow thresher and drying by sunlight on paved yard are the most adaptable systems for the Thanhhoa province.
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