اثر تاريخ كاشت بر شاخص هاي رشد چغندر قند در دشت ازروييه (كشت پاييزه )

Effect of planting date on growth indices of sugar beet in Orzoieh Region ( Autumn sowing)

In order to develop Autumn sowing ,introduce a new climate and investigate of sugar beet growth , an experiment was conducted using a randomized complete block design with four replications in Orzoieh,Kerman in 2000/01 cropping season .Bolt tolerant cultivar (DEZ) was sawn in three different dates including Sep.1th ,Sep.23th ,Oct.12th .and trend of sugar beet growth was studied every two weeks.plants of the first sowing date with maximum CGR 20g/m2/day were significantly better than the latest with maximum CGR 11.9 g/m2/day .The root CGR was low and then significantly increased. The root CGR was in highest after 165 days of germination at the first sowing date. RGR was decreased in all three sowing dates but it was the highest for the third sowing date. The first sowing date had the highest NAR (4.2 g/m2/day ) and LAI. Leaf Area Ratio (LAR) in the first sowing date was more than the others ,but it was the lowest at the end of the season.