NOVELTY - Producing (M1) ammonium polycarbonate and ammonium sulfate involves providing an enclosed composting apparatus for decomposition of a biomass source of nitrogen containing anaerobic bacteria; mixing the nitrogen source with carbon source; providing aerobic bacteria; highly selectively generating ammonia and carbon dioxide inside the apparatus; capturing in an aqueous solution located at the apparatus so as not to be in direct physical contact with resultant biomass; adding sulfate to aqueous solution; and processing the aqueous solution containing captured ammonia and carbon dioxide.    USE - For producing ammonium polycarbonate and organic solid ammonium sulfate (claimed), which is used as fertilizer.    ADVANTAGE - The method produces organic ammonium sulfate from captured ammonia and carbon dioxide found in a typical composting operation that is economical, energy efficient, and not harmful to the environment, and that utilizes only organic nitrogen and organic gypsum and produces an organic ammonium sulfate through highly selective bacterial action and without addition of outside heat. The method eliminates the majority of ammonia emissions and to retain a high nitrogen concentration in the compost for use as a fertilizer; and converts substantially all of the nitrogen present in manure into ammonia and to capture and use the resulting ammonia to manufacture solid ammonium sulfate for use as fertilizer or as a stable form of ammonia for further conversion.    DETAILED DESCRIPTION - Producing (M1) ammonium polycarbonate and ammonium sulfate involves providing an enclosed composting apparatus for decomposition of a biomass source of nitrogen, where the biomass source of nitrogen natively contains anaerobic bacteria; mixing the biomass source of nitrogen with a source of carbon, thus creating a resultant biomass having a high solids content; providing aerobic bacteria external from the biomass to the resultant biomass; highly selectively generating ammonia (NH3) and/or NH4 and carbon dioxide (CO2) inside the apparatus by the action of aerobic bacteria on the resultant biomass; capturing in an aqueous solution located at the apparatus so as not to be in direct physical contact with the resultant biomass, the generated NH3 and/or NH4 and CO2 from an inside of the apparatus; adding sulfate to the aqueous solution; and processing the aqueous solution containing captured NH3 and/or NH4 and CO2 to obtain ammonium polycarbonate and ammonium sulfate. INDEPENDENT CLAIMS are included for the following:    (1) a composition consisting essentially of certifiably organic ammonium sulfate; and    (2) a composition of ammonium sulfate made by the method (M1).