Marigold (Tagetes Patula L. )plants grown in the greenhouse were treated with: (1 )Raw anaer-obically digested chicken manure effluent (ADCME) Was diluted to contain 300mg/L of NH+4. (2) Sand filtered ADCME. (3)Charcoal filtered ADCME. (4) Ammonium sulfate solution containing 300mg/L NH+4 . (5)NaCl solution isotonic to (1). (6)Solution (4) containing isotonic NaCl,and (7) Water Contrast. The plants treated with ADCME did not produce visual syptom of NH+4 toxiciry as plants in treatments (4) and (6) did. All ADCME - treated plants also produced slight visual symptom of salt stress that was much more severe in the other two NaCl treatments-. The ADCME treatments showed lower fresh weight and plant height but more open flowers'than the Contrast. A-mong the three ADCME treatments, the charcoal filtered ADCME produced the best root system and had highest number of flowers perpot. In seedlings(15 - day - old) . the ADCME treatments were similar to those treated by NaCl and/or high ammonium in relative permeability of cell membrane, contents of electrolytes, protein, NH+4 , K+ and Ca2+ in the bathing solutions of both heated leaves and roots ; in contents of chlorophyl 1, Pi and soluble protein in leaves, and in the activities of polyphenol oxidase,peroxidase and Mg2+ - ATPase and Ca2+ - ATPase in both leaves and roots. Charcoal filtere ADCME treatment increased polyphenol oxidase activity in both leaves and roots comparing to the raw and sand filtered ADCME treatments. The toxioity of ADCME on the growth and flowering of marigold may be attributed to both inorganic and organic factors.