Two field experiments were carried out at the experimental station of Sakha Agricultural Research, Agricultural Research Center, Egypt during the two growing successive seasons of 2011/2012 and 2012/2013 to study the effect of foliar application with humic acid at 15, 20 and 25 g/ L; mono potassium phosphate at 1, 1.5 and 2% and vigamax (amino acids) at 0.1, 0.2 and 0.4 ml/L on some morphological and physiological characteristics as well as root yield and quality of sugar beet (Beta Vulgaris L.) plant cv. "Ras poly". Results showed that all tested treatments statistically improved growth parameters i.e., Root length, diameter, size, number of leaves, root and leaves fresh weight , root and leaves dry weight, root yield parameters(i.e., root length, diameter, size, fresh and dry weights of root), root chemical compositions parameters, leaves bio constituents i.e., N, P, K, total sugars and chlorophylls contents as well as endogenous phytohormones (i.e., cytokinins, gibberellins, auxin (IAA) and abscisic acid (ABA)) of sugar beet plant compared with control.The treatments of vigamax (amino acids) at 0.4 ml/L and humic acid at 20 g/L followed by mono potassium phosphate at 2% were more effective comparing in this respect. Conclusively, spraying sugar beet plant with vigamax (amino acids) at 0.4 ml/L treatment induced prospective effects on growth and root yield productivity.