For smaller amounts of soil, oven sterilization is a practical method. You can place the soil in an oven-safe container and bake it until it reaches an internal temperature of 180°F. It’s crucial not to exceed this temperature as it can release toxins. Once cooled, the soil is ready for use.
Microwave Sterilization
Microwaving soil is a quick way to sterilize small quantities. Fill a microwave-safe container with soil, cover it (leaving some ventilation holes), and microwave for around 90 to 150 seconds, ensuring the soil reaches 180 to 200 degrees Fahrenheit. Allow the soil to cool before using it.
Steam Sterilization
Steaming is another effective method. You can use a pressure cooker or a stovetop method with a saucepan. For the stovetop method, add a few inches of water to a large pan, place the soil in heat-proof containers covered with foil on a rack, and boil the water for 30 minutes. Allow the soil to cool before using it.
Boiling Water
This is a simple method for small batches of soil. Pour boiling water over the soil in a large bucket or heat-proof container, and stir to ensure every particle is moistened. Boiling water will kill any insects and many pathogens. For enhanced effectiveness, you can freeze the soil first for about five days before applying boiling water.
