Abstract: A method for producing an organic nutrient slurry from organic material containing at least one of animal material and plant material is provided. The method includes introducing the organic material into a pressurized reactor and subjecting the organic material to agitation and saturated steam at a temperature and pressure within the pressurized reactor for a duration of time sufficient to thermally hydrolyze and denature the organic material into a denatured slurry having mineral particle sizes of less than 200 microns; conveying the denatured slurry and at least one microbial inoculant to an aerobic reactor to form a mixture therein; and introducing oxygen to the aerobic reactor to stimulate aerobic digestion of the mixture, while maintaining the mixture at a predetermined temperature range and predetermined pH range sufficient to support the aerobic digestion, in order to produce an organic nutrient slurry for plants.