effects of type and different nitrogen rates on egyptian broomrape (orobanch aegyptica) control in tomato (lycopersicon esculentum)

to study the effect of type and different nitrogen fertilizers on controlling egyptian broomrape, field and greenhouse studies based on randomized complete block with three replications, were conducted at ferdowsi university of mashhad. greenhouse study treatments were consisted of ammonium nitrate, ammonium sulfate and urea each of which applied at four rates (75, 150, 300 and 350 kg/ha). field experiment treatments were included of ammonium nitrate, ammonium sulfate and urea, applied at three rates (150, 300 and 350 kg/ha). the result of greenhouse studies indicated ammonium nitrate and urea (at all of rates) reduces orobanch infestation about 80 percent. ammonium nitrate and urea at (300 kg/ha) were increase tomato dry weight compare to the control. the field study findings too indicated that ammonium nitrate (300 kg/ha) was the most effective treatments in increasing tomato yield and produced highest yield (53 t/ha). ammonium sulfate strongly decreased tomato biomass plants in greenhouse study but in field conditions produced yield same control. in conclusion we may suggest that applying ammonium nitrate fertilizer could effectively control broomrape in tomato and improve tomato growth and biomass.