Investigation the effectiveness of herbicides in Orobanche weed (Orobanch aegyptiaca) control and yield increase of Virginia variety tobacco (Nicotiana tabacum L.) in Talesh

Tobacco is the most important weed Orobanche, leading to reduced performance and quality of this product. In order to evaluate the effectiveness of herbicides to control weed orobanche and enhancement of the Virginia tobacco leaves, a field experiment in a randomized complete block design with 8 treatments and 3 repetitions in July 2014 was conducted in the city Talesh of Guilan. In this experiment, herbicides glyphosate Sl41% and sulfosulfuron were used in the following concentrations and different times: Herbicides application glyphosate at  0/5 L/ha 25 days at 0/75 L/ha 45 days and 1 L/ha 65 days after transplanting used of postemergence, Herbicides application glyphosate at 0/5 L/ha 35 days at  0/75 L/ha 55 days and 1 L/ha 75 days after transplanting used of postemergence, glyphosate three application at 1/5 L/ha  in 25, 45 and 65 days after transplanting, glyphosate three application at 1/5 L/ha  in 35, 55 and 75 days after transplanting, glyphosate three application at 1L/ha in 25, 45 and 65  days after transplanting, glyphosate three application at 1L/ha in 35, 55 and 75 day after transplanting  solfosolforun at 70g before transplanting + glyphosate 1 L/ha 25.45 and 65 days after transplanting used of postemergence, solfosolforun at 70g before transplanting +  glyphosate 1 L/ha 35,55 and 75 days after transplanting used of postemergence, were the most effective treatment on broomrape control. The results showed that largest percentage decline Orobanche in the number of stem air (100%), shoot dry weight (100%) and the density of tumor underground (66/95%) and the highest performance green leaf tobacco (10,834 kg per hectare), increase performance leaves dried tobacco (3/1664 kg), the average price of a kilogram of tobacco per hectare (60,435 dollars) estimated. Based on the findings 70g treatment of sulfusulfurun before planting seedlings + glyphosate 1 liter per hectare, 35, 55 and 75 days after planting, it can be reported as a superior treatment.