ABSTRACT

Tillage is the basic operation in agriculture and it's energy requirements represents a considerable portion of the energy utilization in crop production. The trials were achieved using the various speed of tractor ( 6,7,8 Km/hr) and tillage depth of (10,20,30 Cm) and a harrowing width of (60,120,180 Cm) respectively. The selected models were analyzed using ANOVA at a 0.05 and also validated. The high values ofthe coefficient of determination for all the selected models and the reasonable agreement between the predicted and actual values of fuel consumption, field efficiency, theoretical field capacity and effective field capacity ofthe disc harrow show that the generated model equations can be used for predictive purposes of the various responses. The linear model equation was significant (P<0.05) for the evaluation of the energy requirements of the disc harrow. The P-value ofthe model term was 0.0347 which shows that the model equation is significant. The linear model developed to predict the energy requirements of the disc harrow with respect to the tillage depth, harrowing width and operational speed were expressed as FC=- 7.25 -0.03D -0.03W +4.76S +0.000DW +5.5e-1DDS +0.002WS +0.0001D2 +0.00004W2 -0.36S2 Where FC is fuel consumption rate in (L/ha), S is the operational speed (Km/hr) ,W is the harrowing width (cm) of the implement and D is the tillage depth (cm). The optimum fuel consumption rate of 6.57 L/ha obtained at optimal tillage depth of 15cm and harrowing width of 90cm, these shows that in conclusion, tillage depth had greater influence on the energy requirements (fuel consumption rate) ofthe disc harrow than operational speed.