study of autumn sowing of sugar beet in the tropical areas of kermanshah province

sugar  is very important role  in  humanbeing feed.  for sugar beet  production in tropical area detemine  sowing and  harvesting date is very important . for this reason three sowing date (1 sep, 20 sep and 10 oct) and three harvesting date (15 apr, 15 may and 15 jun) in complete blouck design as factorial with three replication in two year in sarpol area condoucted. results  showed  that  the first sowing date has highest  bolting and  third  sowing  date  has lowest bolting. thirs harvest date has highest  level of  bolting. root yield  in the first sowing date more than the other. interaction  between two factors showed that 1 sep sowing date  * 15 may harvesting date  for root yield was very better than the other  interaction  factors .  the best date of sowing  in  this area  was until  20 sep  and for  date harvest was 15 may . for development of sugar beet caltivated  in this area need to more investigation.