White foam glass produced from waste glass as raw material is attractive from the viewpoints of waste recycling, white color with high reflectance, and weed control. It is considered to have potential for increasing the power output of bifacial photovoltaic modules, primarily owing to enhanced light reflectance from the ground and also reduced operation and maintenance cost through effective weed control. In this study, we investigated the effect of white foam glass spread in the photovoltaic installation site by measuring the albedo factor and observing the growth of weeds that are known to create shadows over a period of time. An effective increase in albedo was observed after spreading the white foam glass. The transmittance of the white foam glass was very low and the sunlight did not reach the ground below it. Consequently, plant growth and photosynthesis were obstructed and the effect of weed control was observed.
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