Method for producing pumice medium used for plant hydroponics, plant hydroponic device using pumice medium obtained from the method, and plant hydroponic method
<；P>；PROBLEM TO BE SOLVED: To provide a hydroponics method for performing hydroponics in solid culture medium cultivation through direct addition, as a fertilizer ingredient, of a methane digestive fluid obtained as waste after methane fermentation. <；P>；SOLUTION: This hydroponics method for plants includes supplying a nutritious liquid containing a methane digestive fluid diluted to bring an ammonia nitrogen concentration to 20-500 ppm and obtained after methane fermentation to a pumice culture medium 3 imparted with activity to nitrify ammonia nitrogen contained in the methane digestive fluid so as to directly add the methane digestive fluid as a fertilizer ingredient and perform hydroponics in the pumice culture medium. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
