Optimizmum quantitation determination of extract from Trifolium pratense Advances in studies on chemical constituents of Trifolium pratense Determination of biochanin A and formononetin in Trifolium pratense extract by HPLC-ELSD and DAD Karyotype analysis of Sphallerocarpus gracilis and Trifolium pratense from China Screening of Phosphate-solubilizing Bacteria and Their Acting Mechanisms in the Rhizosphere of Red Clover Studies on Callus Induction and Plant Regeneration of Minshan Red Clover Advances in studies on isoflavones in Trifolium protense and their metabolism Best harvest period and preprocessing method for Trifolium pratense