Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages 1-12
Subject Agricultural &Bioresources Engineering
Date of Publication December 25, 2018

AUTHOR(S) Amaefule, Desmond O, Oluka, Ike S. and Nwuba, Uba E. I


A machinery size selection model and annual cost model were developed for heavy tillage implements. The model development was based on differential calculus as in Hunt-Wilson’s least-cost tillage width model. Field processing labour cost was considered and the Hunt-Wilson model’s need for prior arbitrary width-dependent machinery capacity input for width selection circumvented. The model was validated with data from tillage operations of the machinery hiring unit of Anambra State Ministry of Agriculture Awka, Nigeria. The capacity based machinery size selection will assist in decision making on tillage implement selection model; including comparison of machinery alternatives within and across various power sources. A plough capacity of 0.8956 hectare per hour which translates to 2.5997 m was predicted for processing the 675 ha farm simulated by the developed model. This capacity was considered adequate when compared with the lower 1.8385 m width required on the basis of available suitable field operation period. The smallest plough width of 1.7587 m predicted by the Hunt-Wilson model was seen as less than adequate. Finally based on the pieces of equipment available readily in the local market, 3 pieces of 0.310 hectare per hour was chosen to provide the needed plough capacity. Their combined capacity of 0.930 hectare per hour translates to a width of 2.999 m. The corresponding annual machinery cost per hectare was predicted as N5,542.72.

Keywords: Farm mechanization, Field machinery cost models, Minimum-cost tillage machinery selection, Field machine capacity.

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