Abstract
Two experiments were accomplished at Agriculture College farms (Duhok) and in pots during the winter growing season 2011-2012, to investigate the response of local lentil in terms of growth, yield and nodulation to different application methods and concentrations of molybdenum and potassium fertilizer. Both experiments were arranged in Randomized Complete Block Design (RCBD) with three replications and included three factors (Molybdenum application methods; soaking or spraying; Moconcentrations; 0, 5, 10, and 15 ppm and Potassium fertilizer rates; 0, and 160 kg. ha(-1)). The results for field experiment indicated that most of the studied traits excluding plant height were not affected significantly by each of molybdenum application methods (Moa) or concentrations (Moc) and potassium fertilizer. Moa interaction with K was significant for number of pods (NPP), number of seeds (NSP) per plant and final seed yield per hectare (SYH). The final grain yield was positively correlated with each of number of pods per plant, number of seeds per plant and weight of grains. Regarding pot experiment, the foliar spraying of Mo produced higher seeds per plant (9.34). While seed soaking in Mo solution was superior in number of nodules per plant (179.4); 5 ppm of Mo was superior and recorded higher number of branches (2.665) as compared to control unit or other treatments followed by 15 ppm (2.552). The effect of K or its interactions with each of Moa and Moc was not significant on all studied traits in these experiments. While, the second order interaction of the three factors was significant for the number of pods, number of seeds per plant, seed yield, and 1000 grain weight. The results of field experiment were not encouraged concerning the single application of molybdenum or potassium fertilizers on the performance of lentil crop; hence they are not recommended in similar environments. In pots, foliar application of Mo can increase the seed yield while seed soaking is recommended in unfertile soil due to the increasing of nodules in roots.