Climate and Weather

Climate and weather were also found to be primary factors for solar heating success, as they affect the levels of solar radiation and, therefore, soil temperatures. Chellemi et al. (1997) found solarization efficiency as strongly reduced by a cloudy and rainy weather and, more generally, the best results of solarizing treatment were provided in the areas with high summer temperatures. However, even if summer months in warm areas are surely the most suitable periods for solarization, successful applications of this technique against soilborne pathogens, nematodes, bacteria, and weeds were documented also in cooler climates (Raio et al. 1997; Christensen and Thinggaard 1999; Pinkerton et al. 2000; Peachey et al. 2001; Tamietti and Valentino 2006). Effectiveness of soil solarization in unfavorable climatic regions was attributed to adaptability of pathogen heat sensitivity to different climates, which result in lower thermal thresholds in cooler climates (Elmore 1998).

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