Abstract
Abstract. Tillage, the mechanical manipulation of soil, demands a huge amount of energy in order to accomplish various tasks during field operation. Field tests and evaluation were conducted on 37 different tractor makes and models with matching implements at four different sites representing the three regions of Nigeria between 2005 and 2011. Implements used for the trials were tractor mounted 3-bottom disc plough and 18-blade off-set disc harrow. Each tractor was operated on 1.0 hectare (100 m x 100 m) farm land in a randomized complete block design (RCBD). Parameters measured included tractor power rating, travel speed, effective and total time of operation, field efficiency, field capacities (effective and theoretical), depth and width of cut, soil moisture content, soil bulk density and soil resistance to cone penetration, respectively in order to determine energy requirement for each tractor-implement combination. A mathematical model for predicting energy requirement for the tillage operations was developed. The resulting model equation was validated using paired sample t-Test. Results obtained showed that the model equation adequately predicted energy requirement for tillage operations.
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