تأثير زاوية الميل لأقراص المحراث القرصي و سرعة و عمق الحراثة في بعض المؤشرات الفنية و متطلبات القدرة للوحدة الميكنية

Abstract EN

An experiment was conducted on a farm at the College of Agriculture-University of Baghdad during 2010 in a silty clay loam soil, New Holland tractor with Disc plow was used.In this study treatments were laid out using split-split plot with randomized complete block design with three replicates.

The study consist of three factors : First factor was tractor speedwith three level’s (4.27 , 5.51, 7.27) kn/hr, which represented main plots second factor was plowing Depth with two level’s (10,20) Cm, which represented sub plot’s , third factor was tilt angle of disc with three level’s ( 15, 18, 21) which represented sub-sub plot’s.

Slippage percentage , field efficiency , number of clod’s 10 cm/m2 and fuel consumption as well as machinery unit energy requirement were determind in this experiment .

Results obtained indicated that third speed (7.27 km/hr) showed significant superiority in comparison with other speeds (4.27, 5.51 km/hr) in recording higher values of field efficiency (97.722%), lower, value of number of clod’s 10 cm/m2 (5.278 clodm2) , lower value of fuel consumption (41.671 L/ha) and lower value of machinery unit energy requirements (154.994 kw.hr/ha) .

First plowing depth (10cm) showed significant superiority in comparison with second plowing depth (20 cm) in recording lower slippage percentage (6.842 %), higher value of field efficiency (95.353%) , lower value number of clod’s 10 cm/m2 (5.482 clod/m2), lower value of unit energy requirements (158.596 kw.hr/ha).

Third tilt angle (21) showed significant superiority in comparison with other angles (15and 18) in recording lower slippage percentage (7.659%), higher value of field efficiency (98.511%) , lower value of number of clod’s 10 cm/m2 (6.500 clod/m2) , lower value of fuel consumption (44.707 L/ha) and lower machinery unit energy requirement (166.160 kw.hr/ha).

It can be concluded that third tractor speed (7.27 km/hr) with first plowing depth (10cm) with third disc tilt angle (21) showed significant superiority in comparison with other speeds, depth and tilt angles in recording best of machinery technical performance and energy requirement parameters, and therefore it can be recommended using the third speed of tractor with first plowing depth with third disc tilt angle when New Holland tractor with disc plow are used as a machinery unit.