Master's Thesis from the year 2013 in the subject Biology - Botany, , language: English, abstract: This study consisted of four experiments conducted in the greenhouse of Biology Department in the College of Science- University of Salahaddin- Erbil, during 18/4/ 2012 to 28/7/2012. The first experiment consisted of foliar spray of different concentrations of Salicylic acid (0, 50, 100, 200 and 400ppm), the second experiment included the application of different methods of Salicylic acid (250ppm) (presoaking seeds, foliar spray, injection, and soil application). The third experiment consisted of different concentrations of Lead (0, 5, 10, 15 and 20ppm) as soil irrigation, and the fourth experiment consisted of interaction application of Salicylic acid and Lead on vegetative growth, yield and chemical components of common bean. The results obtained were analyzed statistically using Complete Randomized Design (C.R.D) for the first three experiments and Factorial Complete Randomized Design (Factorial C.R.D) for the fourth experiment, with four replications for each treatment. Comparison of means were carried out by using Duncan's Multiple Range Test at the probability of (0.05) for vegetative and yield parameters and (0.01) for the chemical constituents.