When the soil surface is impervious, very dry, or wet,
the composition is preferably applied in two or more ap
plications to insure the preparation of a relatively thick and impervious crust. For impervious or very dry soil, the composition is applied in a dilute form containing about 0.5% to about 4.0% solids with at least 3000 gallons of the aqueous composition being applied per acre; preferably 4500 gallons or more. A second application of the com position is carried out before the ?rst application has had time to set and form an impervious layer. Generally the second application follows the ?rst application within 2 to 8 hours.