الفهرس 
Preparation of seedbedOnly 14 pages are availabe for public view
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Abstract
The field experiments were carried out at the Experimental Farm of kce Mechanization Centre, lMeet El-Deeba, Kafr El-Sheikh Governorate, Egypt. The experimental crop of the present study was wheat variety of Sakha 8. It was planted in an area of about three feddans during the winter season of 1 992!1993 and was repeated in 199411 995. The objective of the present work is to study the effect of ploughing system, ploughing forward speed and levelling system on the following indices :- The results showed that increasing plough forward speed tends to increase the specific fuel consumption for all ploughing systems. The average values of increase the specific fuel consumption rate were 0.52, 0.99 and 1 .OO 1kW.h for chisel plough (one pass), 0.70, 1.19 and 1.45 1kW.h for chsel plough (one pass) followed by rotary plough and 0.94,1.95 and 1.97 1kW.h for chisel plough (two passes) followed by rotary plough at p1oughm.g forward speeds of 2.7, 3.8, and 5.8 km/h, respectively. The fuel consumption decreased by about 29.17,30.22 and 35.6 1 % when the plouglvng forward speed increased from 2.7 to 5.8 km/h for chisel plough one pass, chisel plough (one pass) followed by rotary plough and chisel plough (two passes) followed by rotary plough, respectively. - errw renzc~rementsfo r seedbed nreparatzon: The average values of energy requirements were 13.77, 12.09 and 5.03 kW.h/fed. for chisel plough (one pass), chisel plough (two passes), and rotary plough, respectively, at ploughing forward speed of about 3.5 ladin. The energy requirements were decreased by about 4 1.7 and 33.6 % with rotary plough comparing to the other ploughing systems. Increasing ploughing forward speed tends to decrease the energy requirements for all ploughing systems. The energy requirements decreased by about 44.6%, when the ploughing forward speed increased from 2.7 to 5.8 kmh by using chisel plough (one pass).