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

Table 4

Effects of continuously cultivated soils on Salvia miltiorrhiza lipophilic constituents (, ).

Groups	Contents (%)
	Dihydrotanshinone I	Cryptotanshinone	Tanshinone I	Tanshinone IIA	Total content
Control	A	A	A	A	1.354
1-year continuously cultivated soil	B	B	B	B	1.243
2-year continuously cultivated soil	C	C	C	C	0.92
3-year continuously cultivated soil	AB	D	D	D	0.664
4-year continuously cultivated soil	D	E	E	E	0.464

Note: the values denoted by different letters within the same column represent significant difference at the 0.05 level as compared with various concentration treatment groups.