What is solarization?
Simply put, solarization harnesses the power of sunlight to reduce many gardening problems. A clear plastic sheet is used to cover a garden bed. The heat generated from the sunlight will be trapped under the plastic. This greenhouse effect will increase soil temperatures to a degree that will dramatically reduce harmful garden pests such as nematodes, fungi and weed seeds. 30 days of soil solarization can reduce the incidence of disease and pests by up to 80% all without the use of chemicals.
How to:
Remove spent plants and weeds and till the soil gently to loosen it. Cover with clear plastic sheeting and weight edges to secure in place. (Clear plastic creates higher soil temperatures than black plastic.) To be effective, the soils must start out moist and maintain a fairly high soil moisture content. Moisture increases the heat sensitivity of many soil-borne pests. Leave plastic in place for at least 30 days. Make sure that your beds are raised slightly in the center so that water does not pool up in the center of the plastic following rains and contribute to mosquito breeding.
Solarizing is particularly effective for areas that will be planted with tomatoes as solarization is the most effective organic treatment for nematodes and other tomato pests.
