The main purpose of the study was to select minimum cost inputs and selection of economic set of machines and implements for tilling to threshing operations in Boro rice cultivation. Primary and secondary data from various sources were collected and used in this piece of research. A procedure was developed to select the minimum cost inputs and select an economic set of machines for each farm holdings, considering the minimum cost of inputs, operating costs and capacities of alternatives for each operation, size of annual operational farm holdings and farmers access to the machines. BRRI-dhan 29 was found profitable among Boro rice variety and Leaf Colour Chart (LCC) appeared as best option for determining the amount of fertilizer requirement for Boro rice cultivation. For tilling operation, custom hire service of Tractor appeared profitable for a yearly operational farm holding of 8.29 hectares and above 8.29 hectares ownership of Tractor is profitable. For irrigation options, hired DTW was found profitable for farm sizes less than 2 hectares and STW owning was found profitable for the farm size exceeding 2 hectares. Drum seeder, Japanese Rice Weeder and hired Reaper were found significantly superior for all farm holdings. BAUzia fertilizer distributor was found profitable to the farmers when the annual use exceeded 1.12 hectares. For spraying options, Compression sprayer and Knapsack sprayer could be beneficial to the farmers when the annual use exceed 2.05 hectares and 5.71 hectares, respectively. Owned Reaper was found profitable to the farmers when the annual use exceeded 2.88 hectares. For threshing options, Closed drum power thresher was found profitable to the farmers when the annual use exceed 7.32 hectares. A computer simulation model was developed using Microsoft Visual Basic 6.0 language for easy computation and selection of minimum cost inputs and economic set of machines and implements on the basis of farm size. Agricultural Engineers and DAE personnel may use this expert system as a guiding tool for suggesting farmers for Boro rice cultivation in Bangladesh.
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