| 摘要 |
PROBLEM TO BE SOLVED: To provide an inorganic fertilizer capable, even if a utilization ratio of an agrochemical is reduced, of preventing/controlling crop plant diseases and of accelerating growths of crop plants.SOLUTION: The provided inorganic fertilizer includes lava powder obtained by pulverizing lava stones mined in volcanic areas so as to maintain, within a specified range, the oxidation-reduction potential within a fertilized medium or hydroponic water depending on the perpetual elution of the component of the lava powder into the medium or hydroponic water. This inorganic fertilizer is scattered at a rate of 500 g to 5 kg with respect to 10 a of the crop plant medium. |
