[Effects of different light qualities on field-grown Epimedium pubescens].

The study investigated the effects of different light qualities on the photosynthetic parameters, yield, and bioactive chemical content of Epimedium pubescens under field conditions and identified the optimal light quality for cultivation, aiming to provide a theoretical basis for the application of different light qualities in field production. The variety "Guitong Roumao No.1" was planted with five treatments: black(control), blue, red, yellow, and green shade nets, under 75% shading rate. Dynamic changes in chlorophyll content, photosynthetic parameters, and bioactive chemicals were measured on days 60 and 120. On day 120, the dry weights of the aerial and underground parts were measured, and the root-to-shoot ratio was calculated. The effects of light quality were comprehensively evaluated by principal component analysis(PCA). The results demonstrated that compared with the black net, the blue net increased the total dry weight by 36.28%(P