TABLE 1.

Quantitative analysis of terpenes in rhizosphere soil.

Analyte	Retention time (RT) (min)	Molecular weight	Calibration curve	R2	Actual concentration (μg/g)
Beta-Myrcene	12.33	136.23	y = 313474x – 1E + 06	0.9958	6.13 ± 0.70
D-limonene	14.02	136.23	y = 82102x + 648887	0.9973	67.48 ± 12.99
gamma-Terpinene	15.26	136.23	y = 27272x + 26867	0.9992	66.30 ± 0.96
Estragole	20.43	148.2	y = 425864x – 4E + 06	0.9989	13.54 ± 0.71
Anethole	23.22	148.2	y = 217035x – 86524	0.9941	18.30 ± 3.38

Control, soil without plant culture. The error bar indicates the standard errors of the means (n = 3).