Effects of several microbial agents on growth，  development and quality of Panax notoginseng

A field plot experiment was conducted to evaluate the effects of microbial agents including Bacillus subtilis， Trichoderma harzianum and Bacillus amyloliquefaciensFZB42 on disease occurrence， growth， root dry weight （DW）and effective component of different parts of three-year old Panax notoginseng. The results showed that 3 kinds of microbial agents all had effects on disease control， growth， total DW and total saponins of P. notoginseng. The ratio of disease occurrence was 13.25% of C 1 with good control effect and the order of control effect was C 1 ＞ A ＞ C 2 ＞ C 4 ＞ C 5 ＞ B ＞ C 3 ＞ CK 2 ＞ CK 1 . C 1 had the most impact on plant height， stem diameter and snip coarse， made them rise by 41.11%， 44.44% and 33.96% respectively compared to CK 1 ； C 4 had the most impact on length and width of leaf， made them rise by 37.13% and 24.27% respectively compared to CK 1 . The order of control effect on root DW was C 1 ＞ C 3 ＞ C 4 ＞ B ＞ A ＞ CK 2 ＞ C 2 ＞ C 5 ＞ CK 1 . The total saponins of snip and fibrous in C 3 rose by 69.15% and 248.24% compared to CK 1 ， while by 87.34% and 378.71% compared to CK 2 ， the total saponins of taproots and snip in C 1 rose by 59.61% and 36.78% compared to CK 1 ， while by 205.01% and 51.49% compared to CK 2 . The results indicated that， C 1 （97 mL/667m 2 ）treat ment played a significant promotion role for both disease prevention and control， growth， yield and quality.