Response of Onion to Rotation with Sugarbeet in Azarbaijan Region

For determining the best crop for onion rotation with sugar beeta three year experiment with two year rotations were conducted in three replications in East Azarbaijan Agricultural and Natural Resources Research Center from 2007-2010. Every year two RCBD conducted with two crops (onion and sugar beet). In first year crops cultivated at first trial and other trial led to fallow. In 2nd year، onion cultivated on beet and fallow plots went under same crop cultivation. So in the end of 2nd year we can analysis these rotation systems: onion after onion، beet monoculture and onion and beet after fallow. In the 3rd year، crops cultivated on crops and 2nd year onions. So there were 6 rotation systems; onion and beet crops after fallow in two years، onion after beet in two years، beet after onion، beet after beet and onion after onion in one year. Simple and combine analysis between years and among systems showed significant effects. Onion rotation after beet increased bulb weight، and there was not significant among them in their effect on bulbs. Beet after onion increased، tuber and root yield significantly. In beet، monoculture cultivation produced lesser yield than rotation with onion or after fallow.