PROBLEM TO BE SOLVED: To provide a method for preparing a plant culture medium, the method capable of shortening the preparation time of a culture medium, the plant culture medium that is not inferior in quality to a culture medium prepared by the conventional method.SOLUTION: A method for preparing a plant culture medium is provided, the method comprising the steps of: agitating a raw material of the plant culture medium by an agitator filling the plant culture medium into a cultivation vessel by a bottling machine performing a steam sterilization to the plant culture medium in the cultivation vessel by using a steam injection machine that can inject steam into the plant culture media filled in the cultivation vessel by sticking a steam injection rod into the cultivation vessel and leaving the cultivation vessel till the temperature of the plant culture medium filled therein drops to a prescribed temperature suitable for an inoculation.COPYRIGHT: (C)2014,JPO&INPIT【目的】 従来法によって調製された植栽培基の品質に劣ることなく、植栽培基たる培地の調製時間を短縮することができる植栽培基の調製方法を提供する。【解決手段】 本発明に係る植栽培基の調製方法は、攪拌装置により植栽培基の原料を攪拌するステップと、瓶詰機により植栽培基を栽培容器に詰め込むステップと、栽培容器に詰められた植栽培基に蒸気噴射棒を埋めて蒸気を噴射することができる蒸気注入機を使って栽培容器内の植栽培基を蒸気殺菌するステップと、栽培容器に詰められた植栽培基の温度が接種に適した所定の温度に低下するまで放置するステップと、を含む。【選択図】 図1