بررسی امکان پوشش بذر چغندرقند با استفاده از پلیمر سنتز شده داخلی.

The present study was aimed at determining the effect of internal synthesized polymers on sugarbeet(Zaragan)seed germination and seedling growth characteristics in seed control laboratory and greenhouse of Sugar Beet Seed Institute in Karaj,Iran during 2010-2012. The study was based on a Randomized Complete Block Design with four replications which included nine treatments of bare seed(as control),seeds covered with imported polymer at one level,and seeds covered with internal synthesized polymers at seven levels(between 0.5 and 3.5g/100g seeds). The results showed no significant differences among the studied treatments in terms of seed germination rate,abnormal germinationpercentage in laboratory and seed vigor in greenhouse,whereas the treatments of polymeric covering significantly influenced plumule and radicle dryweight at1% probability level,so that the highest rootlet dry weight was obtained under internal synthesized polymeric covering(0.5g/100gseeds)(4.306g)aswellas in bare seeds(3.741g),seeds covered with imported polymer and seeds covered with domestically synthesized polymers at the rate of 0.5-1.0g/100g seeds.The monitoring of the trend of seed decay revealed that germination rate was significantly decreased and abnormal germination percentage was significantly increased(at 1% probability level)141days after seeds processing. However,these changes were similar for different levels of bare seeds and seeds with polymeric covering.The studied treatments, also, showed significant differences at 1% probability level in terms of the impact of time on seed vigor.The highest vigor(79.33-81.36%) was devoted to the treatment of internal synthesized polymer at the rate of 1.0-1.5g/100g seeds.The lack of the significant influence of the studied treatments on the pre- and post-thinning plant density and the plant density at harvest time revealed that seed covering has no effect on the establishment of sugarbeet plants in farm.