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Field experiment conducted to measure vibrations on three axes longitudinal X, lateral Y and vertical Z on
steering wheel, platform tractor and vertical vibration in seat tractor and seat effective amplitude
transmissibility (SEAT) factor during operation tillage in silt clay loam soil with depth 18 cm in Baghdad. Split –
split plot design under randomized complete block design with three replications least significant design 5 %
used. Three factor were used in this experiment included two types of plows included chisel and disc plows which
represented main plot, three tires inflation pressure was second factor included 1.1 ,1.8 and 2.7 bar, and three
forward speeds of the tillage was third factor included 2.35 , 4.25 and 6.50 km/hr. Resu
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