Abstract
Weed control study on lentil were conducted during growing season 2004 – 2005 at Dohuk and Singar in north Iraq. to determine the effect of different methods of weed control as integrated weed management .Cultural practices been used in different rates of seedling (60.100.140 Kg /ha). Also nitrogen fertilizer had used (0.0.40.80 Kg N/ha) while chemical methods (herbicides) used such as Treflan 1.08.1.44 and Focus ultra 0.1.0.2 L.a.i /ha). The results indicated that weeds compete lentil strongly and reduce lentil yield potentially. Weed density at Dohuk was more higher than at Singar. Increasing rate of seeding was able to improve the competition power against broad leaf weeds at Dohuk. which 100 kg/ha at Dohuk and 140 kg/ha at Singar had increased the seeds yield of lentil. Different levels of fertilizer use had insignificant result in increasing lentil yield .In general. rate of seeding had more important role for seed yield increasing than nitrogen fertilization . Focus ultra had reduced narrow leaf weed biomass at Dohuk up to 77.80% for two concentrations of herbicide respectively. where as Treflan had less effect (13.3.10.8%). On the other hand Terflan was more effect on broad leaves. biomass weeds than Focus which gave up to 74.77% if it camper with 28.30% for two doses of Focus ultra respectively.But there was no clear evidence in increasing seed yield related to increase herbicides doses. The best result in seed yield had seen at Dohuk when used Treflan at 1.44 La.i /ha with 140Kg/ha seed rate under 80Kg/ha nitrogen fertilizer. These results had also seen at Singar but under 40 Kg/ha nitrogen fertilizer.
