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Choose the area of ground from which you’ll be taking soil and cultivate the area. Remove any dead leaves, weeds, plant trimmings and other debris. Rake through the soil and smooth it out so that it is level. Do not use areas that contain pesticides, chemicals or other pollutants. This can contaminate your soil. The water should reach approximately 12 inches deep into the soil. This will improve how well heat will conduct through the soil, heating it up and solarizing it thoroughly. Seal in the soil under a plastic sheet; you can use a painter’s tarp, which is readily available at home supply stores. Place rocks or line soil along the edges of the sheet to hold them down. There will be a good deal of heat generated and trapped under the plastic sheet, which will work to solarize the soil and kill unwanted pests, pathogens, and weeds. Summertime with hot and sunny weather is the ideal time to solarize soil.  Leaving the tarp on longer than 4-6 weeks will result in a disintegrating tarp. You can rotate the areas of your garden that are being solarized , devoting a section of the garden to solarizing soil while another section has growing plants. Covering the ground like this in the colder months will actually create better conditions for weeds by warming the soil. Only do this during warmer months. Fill glass or metal baking pans full of soil. Cover tightly with tin foil and bake at 200 °F (93 °C) for about 30 minutes. Stir the soil every 5 minutes as it bakes. Allow to cool completely. Your house will smell earthy when you use this method, which can be off-putting to some people.

Summary:
Rake through the soil. Water the soil thoroughly. Cover the soil with a clear plastic sheet. Let the soil area sit for 4-6 weeks. Alternately, sterilize the soil in your oven.