This study was conducted to determine the ammonia-reducing capacity of effective microorganisms (EM) on chicken manure. Chicken manure was partitioned using a plastic pail with the bottom portion removed. The manure to be sprayed on was divided into four treatments: Treatment 1 served as negative control; Treatment 2 contained the liquid extract from chopped vegetable scraps, untreated water and brown sugar while coconut water, brown sugar and coconut shavings was assigned to Treatment 3. The positive control using a commercially-available EM was assigned to Treatment 4. The treatments were randomly allocated using complete randomized design (CRD). Administration of the spray was done at eight o'clock on the first day of field trial. Results were tested eight hours after the administration. Data gathered were dryness of the surface of the manure, pH of the manure, temperature of the environment in correlation to the ammonia production, mean ammonia concentrations, and the profile of the bacteria in the manure, which was statistically analyzed using Two-Way Analysis of Variance (ANOVA) and the statistical significance was tested using Tukey HSD test. In conclusion, this study proved that after 2 days, the coconut and the vegetable extracts were able to lower the ammonia levels (P<0.01). The microorganisms isolated in the formulated extracts were similar to those present in the commercially-available EM. However, the results suggest further research on the factors that contributed to the decrease in ammonia levels.