STUDY EFFECTS OF SEVERAL SUCKER CONTROLLERS APPLICATION WITH DIFFERENT CONCENTRATION ON YIELD OF VIRGINIA TOBACCO (MALE STERILE CULTIVAR PVH19)

For study effects of several sucker controller usage with different concentrations in increasing yield of Virginia tobacco (cultivar male sterility PVH19) in order to determination of the best controlling method for suckers in this plant an experiment in randomized complete block design with three replications in Bodian village (Rasht township) in 2011 farming year was conducted. The studied treatments in this research were consisting of 14 levels of different chemicals suckers’ controller (fatty alcohol, prime plus) with different concentrations (15 and 20 cc) and different application times (10 and 14 days). Measured traits in this study were consisting of fresh leaf yield, leaf width, stem diameter and number of leaves per plant. Results of experiment showed that, the effect of applied treatments on traits of leaf width and stem diameter was significant at 1% probability level, also on fresh leaf yield at 5% probability level. But on number of leaves per plant was non significant. The highest yield of fresh leaf was recorded from topping on button stage and two times spraying with prime plus 125 EC (15 cc for each plant) with time interval of 14 days (41730 kg/ha).