DEVELOPING A COMBINE MACHINE FOR INCREASING SEPARATION EFFICIENCY OF ONION CROP

The experiments were carried out at El-Maamoria village- El-Gamalia region, Dakhlia Governorate during onion harvesting season 2008-2009 to evaluate onion harvesting crop by a combine machine for harvesting and collecting onion cropandachieving the following factors: Decreasing separation losses, increasing soil pulverization and increasing cleaning efficiency of onion crop. All treatments were carried out on onion crop at two different moisture contents (M1=24.5% and M2= 20.5%) and four different of rear angle of ray separator (R1=0, R2=5, R3=10 and R4=15 degree) with different four vibrator speeds (V1=170, V2= 200, V3=230 and V4=260 rpm ).The best results of separation losses and cleaning efficiency were at (M2=20.5%, R1=5 degree, V4=230 rpm).