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High-efficiency monoculture severely inhibits the growth of  Salvia miltiorrhiza  Bge and decreases the yield and quality of crude drug, thus resulting in serious economic losses in China. Here, we selected four replanted field soils with 1, 2, 3, and 4 years of monoculture history to investigate the influence of continuous monocropping soil on the property of medicinal materials by pot experiments. Results showed that the commodity appearance and active ingredient contents of  Salvia miltiorrhiza  were significantly affected by soil with different continuous monocropping years. Along the time series of plantation soil, the diameter of main roots, weight of fresh roots, and total contents of hydrophilic and lipophilic components demonstrated a decline tendency. With the method of PCA, the property of medicinal materials affected by continuous monocropping soil was evaluated by the following formula:  F  = (0.3762 × F1 + 0.2320 × F2 + 0.1913 × F3 + 0.0994 × F4)/0.8989. Eventually, crude drug properties ranked according to comprehensive scores were as follows: CK (0.380) > 1 year (0.360) > 2 years (0.348) > 3 years (0.337) > 4 years (0.245). For the medicinal plant of  Salvia miltiorrhiza  Bge, continuous monocropping soil had significant effects on the property of  Salvia miltiorrhiza  and should be ameliorated by some measures. The results provide support for the optimal continuous cropping year selection and continuous cropping obstacle abatement of  Salvia miltiorrhiza  Bge.

Effect Study of Continuous Monoculture on the Quality of Salvia miltiorrhiza Bge Roots