Soil conditioner and its manufacturing method, soil, and plant cultivation method

摘要

PROBLEM TO BE SOLVED: To provide an environment-friendly soil conditioner having excellent water permeability, breathability and water retention. SOLUTION: The soil conditioner contains a calcined product of a raw material containing coal ash, has a unit volume mass of 0.8 kg / L or less, a crushing strength of 8 N or more, and an elution amount of boron and arsenic. Provide soil conditioners that satisfy the environmental standards of Ministry of the Environment Notification No. 46 of 1991. In addition, at least one elution amount of selenium, fluorine, and hexavalent chromium satisfies the above environmental standard. [Selection diagram] None