Field experiments were conducted at Nubareia Agricultural Research Station Farm on a calcareous soil under drip irrigation system to study the effect of adding humic acid (20 g/l) as well as foliar application with putrescine (1.0 mg/l), novavol (2.5 ml/l) and vegimax (0.2 ml/l) on growth, yield and its components as well as chemical composition of snap bean plants cv. Paulista. The obtained results indicated that, application of humic acid, novavol or vegimax significantly increased all of the studied growth characters, ie plant height, number of leaves and branches/plant, leaf area as well as dry weight of shoots and roots at both samples. However, putrescine did not show a clear trend for various studied growth characters. Moreover, addition of humic acid as well as foliar application by novavol, putrescine and vegimax significantly increased yield and its components, ie total green pod yield, number of pods/plant, pods weights/plant, average pod weight and pod diameter at both pickings. Plant pigments, ie chlorophyll a, total chlorophyll and caroenoids concentrations either in leaves or pods significantly increased at both samples when the plants treated with humic acid, novavol and vegimax. In shoots, P, K, Ca, Mg, Zn and Fe concentrations significantly increased at both samples with all studied applications. Meanwhile in pods, addition of humic acid significantly affected on N, K, Fe and Cu concentrations, whereas foliar application with novavol and vegimax significantly improved N, K, Mg, Zn, Mn and Fe concentration at both pickings. On the other hand, application of any treatments significantly decreased Na and Cl concentrations in both shoots and pods at both samples. Results also showed that all studied applications significantly increased some organic compounds, ie total sugar, total free amino acids and total soluble phenols concentrations at both of shoots and pods in both samples as well as protein concentration in pods. Meanwhile, all studied applications significantly decreased pods bending% and fiber content in pods at both pickings as well as pod humidity% and nitrate concentrations with humic acid, putrescine and vegimax treatments.[Journal of American Science 2010; 6 (10): 552-569].(ISSN: 1545-1003).