Abstract
Pots experiment was carried out at the college of Agriculture. and Forestry, Mosul University in winter growing season 2005 to determine the effect of herbicides (Trifluralin 1.08 , 1.44 , Focus ultra 0.1 , 0.2 L/ha) with check treatments and nitrogen fertilizer (0.0 , 40 , 80 Kg N/ha) on growth of lentil and its nodulation . The result indicated that terflan had negative effect on all plant growth charactertis and number of nodulation on its roots, but focus ultra had positive result on plant high, number of branch and number of nodulation . 40 Kg N/ha.fertilizer gava a significant result on plant high and nodulation than 80 Kg N/ha . In general focus ultra and 40 Kg N/ha was more positive effect than treflan or 80 Kg N/ha The best result obtained was when interaction between focus ultra 2L/ha with 40 Kg N/ha fertilization or 1L/ha of the same herbicide with 80 Kg N/ha occurred and gave a good growth nodulation on root lentil crop .
