We are gonna start this tomorrow. It has worked for us in the past. :)
Solarization uses radiation from the sun plus moisture to heat soil to 99 to 125 degrees Fahrenheit. This treatment not only kills weeds and weed seeds, but also soilborne pathogens such as fungi, parasitic nematodes, insects and some bacteria.Soil solarization also speeds up the breakdown of organic matter in the soil, resulting in more available nitrogen, calcium, magnesium and potassium.It’s a simple, chemical-free way to revitalize an old planting bed or prepare a new one.
How to solarize weeds:
•Rototill or spade existing plant material and additional organic matter (chicken manure, grass clippings, etc.) into the soil. Decomposing organic matter contributes additional heat to the process and can also protect soil microbes.
•Rake the soil smooth and lump free — the goal is a clean, flat surface.
•Wet the soil to a depth of 12 inches (the moisture is critical to conduct heat through the soil). Keep the soil moist throughout the solarization period.
•Cover the soil surface with clear (preferably UV-stabilized) plastic, 1.5 to 3 millimeters thick. The plastic must be held tightly against the soil surface; secure the edges by burying them 5 to 6 inches into the soil.
Note: Thinner plastic is less expensive and may be used in a double layer, but is more prone to wind or animal damage.
In the cooler days of spring, six to eight weeks may be necessary.
