Field experiments were conducted in 2007-2008 and 2008-2009 winter seasons to study the effect of ammo acids (AA) and humic acids (HA) and their interactions in control of chocolate spot and rust diseases, growth enhancement, chemical changes, and chlorophyll content of faba bean plants. The maximum reduction of disease severity of chocolate spot at 55 days from planting was recorded with the interaction between AA plus HA at 1000 ppm each then HA at 1000 ppm, while, at 75 days the maximum reduction in both disease severity and disease incidence occurred by AA at 3000 ppm followed by the treatment of HA at 1000 ppm. HA at 3000 ppm followed by the interaction between AA l000 and HA 1000 ppm then the treatment with HA 2000 ppm were the most effective in reducing rust disease severity of faba bean plant. All morphological traits (plant height, no of branches and leaves plant^-1) and yield components (pods No./plant and weight of 100 seed) as well as macronutrients content (N, P, K in seeds and straw) and chlorophyll content significantly increased by the application of AA (2000 ppm) interacted with HA (2000 ppm). The maximum plant seed yield per plant occurred under the application of AA plus HA (2000 ppm each) followed by AA (3000 ppm) then AA (1000 ppm). On the other hand, number of seeds pod^-1 did not significantly affected.
The present investigation recommended using AA at 1000 ppm and HA at I000 ppm as foliar application to decrease the damage of chocolate spot and rust diseases as well as improve growth and mineral content in addition the advantages as environmental safety and coast effective.