Intensive vegetable production trials were conducted for three years at Windsor (sandy terrace soil) and Mt. Carmel Connecticut (loamy upland soil) following yearly applications of spent mushroom compost (SMC) and chicken manure compost (CMC) applied at two rates (56 or 112 t/ha) as the sole source of nutrients. Yields of seven crops from these amended plots were compared to yields from control plots fertilized with NPK fertilizer. Yields of all vegetables increased as the rate of compost increased. Average yields of tomatoes (Lycopersicon esculentum Mill.), peppers (Capsicum annuum L.), and spring and fall broccoli (Brassica oleracea L.) on all CMC-amended plots at both rates and sites in all years equaled or were greater than fertilized controls. Yields of eggplant (Solanum melongena L.) from all compost-amended plots at both sites in all years equaled or were greater than fertilized controls. Cauliflower (spring and fall) (Brassica oleracea L.) yields from CMC-amended plots (both rates) equaled or exce...