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 crop and achieving the following factors: Decreasing harvesting costs of onion crop, Decreasing a partial and total damage caused in onion bulbs, Decreasing harvesting period and Easing of collecting onion crop. by using a developed combine machine to harvesting and collecting of onion crop. All treatments were carried out on onion crop at four different speed ratios K (ratio of elevator speed to machine forward speed) (K1=1.8, K2= 1.55, K3= 1.05 and K4= 0.8) and four different tilt angle of share (T1=10, T2=15, T3=20 and T4=25 degree) with different four depths of share (D1=4, D2= 5.5, D3=7 and D4=8.5 cm ).The best results of harvesting efficiency, damage ratio and fuel consumption were at (K3= 1.05, T4=25 degree, D3= 7 cm).
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 crop and achieving 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).
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