The effects of 3 N sources, ammonium sulfate (AS), ammonium nitrate (AN), and sodium nitrate (SN) in combination with P, K, Ca, and Mg on vine weight, leaf Mg and Mn concentrations in Bush Blue Lake 274 snap beans were studied in 3 greenhouse experiments using a Hagerstown silt loam soil. In NP treatments, regardless of N source, plants were more vigorous, by 29% or more when compared to those of Check or N treatment. SN resulted in slightly less vigorous plants with higher Mg and lower Mn concentrations compared to those of AS. AN treatments had intermediate effects. Addition of K resulted in increased vine weight and decreased leaf Mg concentrations. Adding both K and Mg to the NP treatment did not affect the leaf Mg concentration.