Two field experiments were carried out during two successive summer seasons of 1998 and 1999 at the Experimental Farm of National Research Center at Shalakan (Qalubia Governorate).The experiments were conducted to study the independent application and the combined effects of four organic wastes namely, water hyacinth, peas, orange and chicken manure on squash growth, nutrients contents and fruit yield. Application of compost which contained water hyacinth + peas + orange + chicken manure significantly increased all growth parameters i.e., vine length, number of leaves, fresh and dry weight of branches and leaves and fruit yield.The chemical analysis of vegetative parts revealed some benefits from organic wastes due to their content of N, P and K. The chemical analysis of squash fruits revealed some beneficial increase in N,P and K  due to organic manure application although, only the increase of K was significant.