To provide an afforestation/soil stabilization material which is used for thick-layer base material hydroseeding method or a soil stabilization processing method, is capable of forming an excellent surface within a short time and is capable of inhibiting elusion of pollutants from soil.

The afforestation/soil stabilization material effective in inhibiting the elution of pollutants is prepared by mixing 10-80 pts.mass first additive and 0.2-20 pts.mass second additive against 100 pts.mass ash component, wherein the first additive contains at least calcium sulfate and a cement component and the second additive essentially comprises an iron powder, calcium oxide and aluminum oxide.