PROBLEM TO BE SOLVED: To provide a method for treating food residue, in which the food residue is decomposed and digested, and is converted into an earthworm compost by using earthworm； then the compost is used as an organic fertilizer； and further, a liquid fertilizer obtained in the process for converting the food residue into the earthworm compost is supplied to the soil or the like of an agricultural field without requiring cost.SOLUTION: A box 2 for an earthworm farm 1 is formed with a square-shaped circumferential wall 21 and a bottom wall 22, then the bottom wall 22 is formed into an inclined face inclining downward to one side wall from opposing the other side wall, and a plurality of openings 21a communicating with the surface of the bottom wall 22 are formed at lower end parts of the one side wall. The box 2 is provided along one side of an agricultural field F so that the one side wall, in which the openings 21a are formed, may nearly face one side of the agricultural field F. After an earth worm growing bed 3 is laid in the box 2, food residue is sprayed on the earth worm growing bed 3. Thereby, the sprayed food residue is decomposed and digested by the earth worm and is converted into an earthworm compost. Meanwhile, a liquid fertilizer formed in the process for converting the residue into the compost is introduced to the agricultural field F.【課題】みみずを利用して食物残渣等を分解消化してみみずコンポストに転換し、有機肥料等として利用し、さらには、みみずコンポストに転換する過程で得られる液肥を圃場の土壌等にコストをかけることなく供給する食物残渣等の処理方法を提供する。【解決手段】みみずファーム１の箱体２を方形状の周壁２１及び底壁２２から形成し、底壁２２を対向する他側壁から一側壁に向かって下り勾配に傾斜する傾斜面に形成するとともに、一側壁の下端部に底壁面に連通する複数個の開口２１ａを形成する。この箱体２を、開口２１ａを形成した一側壁が圃場Ｆの一辺にほぼ面するように、圃場Ｆの一辺に沿って設置するとともに、箱体２内にみみず飼育床３を敷きつめた後、みみず飼育床３上に食物残渣を散布し、散布された食物残渣をみみずによって分解消化させてみみずコンポストに転換する一方、みみずコンポストに転換する過程で生成される液肥を圃場Ｆに導く。【選択図】図２
