An artificial soil culture medium capable of retaining easy-to-use water in a properly adsorbed state according to the type of plants. An artificial soil culture medium (100) comprising secondary particles (50) formed by further aggregating a plurality of primary particles (10) formed by assembling a plurality of fillers (1), wherein an average particle diameter of the primary particles (10) is in a range of 50 to 1,000 m, In the particle size distribution of the primary particles 10, 95% or more of the primary particles 10 are contained in the particle diameter range of 0.5 to 1.5 times the average particle diameter, and the average particle diameter of the secondary particles 50 is 0.2 To 10 mm, and in the particle size distribution of the secondary particles 50, 95% or more of the secondary particles 50 are contained in the particle size range of 0.5 to 1.5 times the average particle diameter.植物の種類に応じた適切な吸着状態の易効水を保持することができる人工土壌培地を提供する。 フィラー1を複数集合してなる一次粒子10をさらに複数集合して形成した二次粒子50を含む人工土壌培地100であって、一次粒子10の平均粒径が50~1000μmの範囲に存在し、一次粒子10の粒度分布において、平均粒径の0.5~1.5倍の粒径範囲に一次粒子10の95%以上が含まれており、二次粒子50の平均粒径が0.2~10mmの範囲に存在し、二次粒子50の粒度分布において、平均粒径の0.5~1.5倍の粒径範囲に二次粒子50の95%以上が含まれている。
