Onion  plants (Giza 20 cv.) were grown in 1997-1998 and 1998-1999 seasons in Maryout Experimental Station of Desert Research Center , Alexandria Governorate to study the effect of FYM and town refuse fertilization treatments on onion plants before transplanting at rates of 10 and 20 ton/fad. for each, in addition to  the control. NPK fertilizers were applied at rates of 40 N: 30 P₂O₅ :50 K₂O , 60 N: 45 P₂O₅  :75 K₂O and 80 N: 60 P₂O₅  :100 K₂O kg/fad.The combination between organic manure and NPK treatments were also studied . Obtained results show that, organic manures or / and NPK treatments showed a significant increase in growth parameters, total yield, fresh and dry weight of bulb and bulb diameter . Chemical composition determined as N,P,K,Pb,Cd and Ni content,as well as T.S.S percentage in onion bulbs increased significantly due to treatments as compared with the control. The highest values and best quality concerning the  previous characters was obtained in plants which  received 20 ton/ fad of  town refuse in addition to 60 N, 45 P₂O₅  and 75 K₂O kg/fad. The increase in heavy metals content in onion bulbs was within the  safety  limits for human consumption .