Experts and BHG readers answer.
how do I solarize soil and what are the benefits?
If done properly, soil solarization can kill weed seeds, suppress most diseases and insect pests such as nematodes while having little affect on beneficial soil organisms. Usually you must leave the area to be solarized covered with clear plastic for about 6 weeks in summer. For details check the University of California extension publication on soil solarization.