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Fields that are not tilled after crop harvesting reflect a greater amount of solar radiation than tilled fields. This phenomenon can reduce temperatures in heat waves by as much as 2 °C. Unploughed stubble is lighter in colour and reflects more solar radiation than tilled surfaces. Measurements taken show that approximately 30% of sunlight is reflected back due to the albedo effect - the albedo is a measure of the reflectance capacity of reflective surfaces. [Source: ETH Zurich]
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