soil conditioner(n = noun.substance) - a chemical substance used to improve the structure of the soil and increase its porosity; "gypsum can be used as a soil conditioner"
is a kind of chemical, chemical substance
air conditioner, alkali soil, alluvial soil, bog soil, chernozemic soil, conditioner, desert soil, desertic soil, free soil party, gilgai soil, gumbo soil, hay conditioner, leaf soil, night soil, podsol soil, podsolic soil, podzol soil, prairie soil, regur soil, residual soil, soil, soil bank, soil conservation, soil erosion, soil horizon, soil pipe, soil profile, soil science, surface soil, tundra soil