Table 3 Effects of P. frederiksbergensis JW-SD2 on growth of poplar seedlings during the 150-day trial. Values are given as mean ± standard deviation of five replicates and lowercase letters within every single column of shoot heights or ground diameters indicate significant differences at P < 0.05

7.35 ± 0.90 a

32.57 ± 4.74 a

347.15 ± 70.76 a

108.88 ± 4.98 a

1393.45 ± 68.73 a

170.05 ± 6.26 a

2237.82 ± 192.80 a

3.04 ± 0.48 a

5.96 ± 0.91 a

101.08 ± 5.03 a

9.32 ± 0.89 a

217.60 ± 31.66 a

12.38 ± 0.82 a

322.52 ± 37.49 a

7.41 ± 0.61 a

24.46 ± 3.02 b

232.82 ± 54.44 b

85.62 ± 6.73 b

1060.82 ± 114.25 b

151.45 ± 6.22 b

1952.02 ± 122.90 b

2.83 ± 0.33 a

5.15 ± 0.22 b

83.16 ± 15.78 bc

7.78 ± 0.58 b

176.20 ± 11.47 bc

10.78 ± 0.62 b

282.73 ± 24.50 bc

7.34 ± 0.74 a

31.46 ± 3.42 a

329.59 ± 40.11 a

91.44 ± 5.33 b

1152.24 ± 111.61 b

150.54 ± 8.90 b

1968.37 ± 254.85 b

2.73 ± 0.41 a

5.19 ± 0.46 b

91.07 ± 7.84 ab

8.13 ± 0.27 b

200.72 ± 27.11 ab

10.82 ± 0.63 b

299.44 ± 26.57 ab

7.37 ± 0.48 a

22.06 ± 5.72 b

199.81 ± 71.97 b

66.19 ± 6.14 c

798.12 ± 67.30 c

126.48 ± 4.63 c

1622.74 ± 151.75 c

2.65 ± 0.31 a

4.52 ± 0.40 b

70.92 ± 9.49 c

6.76 ± 0.55 c

156.09 ± 21.38 c

9.47 ± 0.38 c

258.98 ± 25.13 c