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Solarization affects all living organisms that are present in the upper 30 cm (11.8 in) of the soil. It can be used to manage weeds, diseases caused by soil-borne pathogens, and nematodes. Effectiveness of solarization can be somewhat variable when methyl bromide is the standard with which it is compared.
Simplified view of the layers in the ionosphere over the period of a day Other effects like the season and the state of the Sun also have a major effect. Sunspots and solar disturbances have a major impact on the level of radiation received, and these effects are covered in other articles on this website on Sunspots and Solar Disturbances.