Survey of herbicide application reduction possibility using of nitrogen fertilizers on broomrape (Orobanche aegyptiaca L.) control in tomato fields

In order to study the possibility of broomrape (Orobanche aegyptiaca L.) control in tomato fields, with using herbicides and nitrogen fertilizers, a field experiment counducted at Savojbolagh in 2008. A randomized complete block design with a split plot layout was used, with 4 replications. Using the nitrogen fertilizers (Ammonium sulphate equal 500 kg ha-1, urea equal 200 kg ha-1 and no fertilizer) were the main plots and application of postemergence herbicides (methsulfuron methyl + sulfosulfuron at 32 g a.i ha-1, sulfosulfuron at 18.7, 37.5 g a.i ha-1, rimsulfuron at 7.5, 15 g a.i ha-1 and not herbicide using) were the sub plots. All herbicides were used 30, 40, 50 days after tomato transplanting in fields. The results showed glyphosate caused no damages on tomato plants and provided best control of broomrape. Sulfosulfuron 18.7 and 37.5 g a.i ha-1, rimsulfuron 7.5 and 15 g a.i ha-1 and methsulfuron methyl + sulfosulfuron 32 g a.i ha-1 had no effect on broomrape control. Using ammonium sulphat and urea with and without combination herbicides had no effect on broomrape control.