الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The developed multipurpose seedbed preparation (MSP) equipment was fabricated to limit soil disturbances by decreasing the number of field passes needed for land preparation by performing one or more of different three operations (plowing, surface leveling, and soil finishing/smoothing by fining and compaction). MSP equipment was evaluated against its ability to increase soil clods to less than 10 cm with calculating the fuel consumed, effective field capacity, draft force, power requirement, specific energy and total cost. Study variables were forward speed (four tractor forward speeds of 2.6, 3.8, 5.6, 6.9 km/h), two soil conditions (soil with soybean as previous crop ”SB” and with corn as previous crop ”CP”), and the combination of used parts in MSP. Maximum percentages of clod mean weight diameter less than 100 mm was 79.8 % and it was recorded at all the three different parts separately and in sequence (A)+(B)+(C) were operated with forward speed of 2.6 km/h and 14.50 % soil moisture content. Fuel consumption increased with increasing the tractor forward speeds, and at lower soil moisture content and for more units to be operated with the chisel plow in one travelling pass. Maximum effective field capacity was 1 fed/h and it was achieved by using the developed equipment either with chisel plow alone (A) or operating the equipment with two units, chisel plough and the soil leveler. Operating the seedbed preparation equipment with different combination parts gave higher values of powered required in corn harvested soil (CP) than SB. alternative conventional seed preparation equipment costs much more using the developed MSP equipment units. Maximum operational cost for MSP equipment’ units was 130.8 L.E/h for using chisel plough + rolling harrow unit (A+B) same time under CP soil condition. Cost for using traditional chisel plow, disc harrow, normal soil leveler, (traditional chisel plow + disc harrow), and (chisel plow+ normal soil leveler) were 180, 160, 120, 340, and 300 L.E/h respectively at 2.6 forward speed.