The following are claimed : a process for disposing of decomposable organic waste material, comprising: (i) incorporating waste material sample into test soil and applying sufficient nutrient to produce complete decomposition of sample by soil organisms; (ii) analysing test soil at intervals to determine quantity of nutrient required to decompose sample and quantity of nutrient material released after decomposition; (iii) determining quantity of nutrient material required to grow predetermined crop in disposal soil; incorporating waste material into disposal soil; (iv) applying nutrient material to disposal soil to induce a decomposition phase in which soil organisms decompose the incorporated waste material and a mineralisation phase following the decomposition phase in which the soil organisms release nutrient material to the disposal soil; (v) the applied nutrient material is applied in an amt exceeding the quantity of the material required for growth of the crop and less than the sum of the nutrient material determined to be required to decompose the waste material and the quantity determined to be required for the growth of the crop; and (vi) planting the crop in the disposal soil such that the crop absorbs nutrient material released to the disposal soil during the mineralisation phase.    Also claimed are a process for disposing of decomposable organic waste material; and a process for disposing of a decomposable oil-contg. organic waste material.    Use - Useful for disposal of organic waste contg large quantities of fat or oil e.g. in landfill sites esp animal and vegetable matter, spoiled produce and meat prods from grocery chains, table scraps from restaurants, fat and animal by-prods from packing houses etc.    ADVANTAGE -   Nutrient requirements for rapid waste decomposition is reduced. Soil organisms and crop growth tend to immobilise soil available nutrients through the process, and no soil available nutrients remain after the completion of the process. Leaching of nutrients to ground water is minimised.