Table 4 Contributions of γ-PGA-C to the carbon (C) pools of plant-soil system at different sampling days.

From: Effects of poly-γ-glutamic acid (γ-PGA) on plant growth and its distribution in a controlled plant-soil system

C (%)

Day

Shoot

Root

Plant

Soil

Plant-Soil

1

0.070 ± 0.004a

0.20 ± 0.007a

0.077 ± 0.004a

0.37 ± 0.013a

0.36 ± 0.013a

3

0.045 ± 0.004b

0.15 ± 0.017b

0.050 ± 0.003b

0.36 ± 0.005a

0.36 ± 0.005a

7

0.026 ± 0.005c

0.17 ± 0.028ab

0.039 ± 0.003c

0.37 ± 0.009a

0.36 ± 0.009a

15

0.022 ± 0.002cd

0.074 ± 0.004c

0.025 ± 0.002d

0.34 ± 0.002b

0.32 ± 0.002b

30

0.012 ± 0.003de

0.058 ± 0.008cd

0.015 ± 0.002e

0.29 ± 0.002c

0.27 ± 0.002c

45

0.007 ± 0.004e

0.056 ± 0.006cd

0.011 ± 0.004e

0.26 ± 0.006d

0.23 ± 0.005d

60

0.011 ± 0.004de

0.023 ± 0.006d

0.012 ± 0.004e

0.24 ± 0.010d

0.20 ± 0.009e

  1. Means followed by the different letters in the same column are significantly different (p = 0.05); Contribution of γ-PGA-C to the C pool in plant-soil system was calculated as the percentage of the recovered γ-PGA-C to the total C in each C pool.
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