FFECT OF SOME HERBICIDES AND NITROGEN FERTILIZATION ON NODULATION GROWTH IN LENTIL CROP (Lens culinaris MEDIC

The factorial pots experiment was conducted in order to investigate the effect of some herbicides ( Trifluralin 2.4 , 3.2 , Focus ultra 1,2 L/ ha) with check treatment and nitrogen fertilizer ( 0.0 , 40 , 80 kg N / ha) on growth of nodulation in 2005-2006 season at Agric and Forestry college , Mosul Univ . The results indicate that treflan had effect negtively on number and weight of nodulation but focus ultra had positive result on it . Weight of nodulation had increased at 80 kg N / ha but numbers was reduced . The best results obtained with interaction between focus ultra 2 L / ha and 40 kg N / ha fertilization or 1 L/ ha of the same herbicide with 80 kg N / ha which gave good growth of nodulation on root lentil crop .