Abstract:We studied solar radiation by separating it into three wavebands:ultra violet radiation( UVR ,300~400nm),photosynthetically active radiation (PAR ,400~700nm) and near infra red radiation (700~1100nm).The comparative study showed that the spectral composition of the solar radiation UVR∶PAR∶NIR was 5.2∶48.2∶46.6 inside the inter cropping system and 5.1∶52.4∶42.5 outside the inter cropping system (control).The compositions of three wavebands, UVR∶PAR∶NIR were 5.2∶51.5∶43.2 and 5.0∶51.9∶43.1 ins...