Table 1. Mean amounts ± SE (ng) of volatile organic compounds (VOCs) detected in the blends of 10-day-old healthy maize seedlings during a 3 h collection period.

	Treatment
Compounds	Without microorganisms	With soil microorganisms
(R,R)-2,3-butanediol	0.0 ± 0.0	154.6 ± 25.2
(R,S)-2,3-butanediol	0.0 ± 0.0	853.6 ± 142.5
β-Myrcene	11.2 ± 2.2	9.0 ± 0.7
Linalool	99.9 ± 17.3	98.5 ± 13.0
	Without microorganisms	Without microorganisms and BD in airflow
(R,R)- and (S,S)-2,3-butanediol	0.0 ± 0.0	304.6 ± 53.7
(R,S)-2,3-butanediol	0.0 ± 0.0	1151.2 ± 503.0
β-Myrcene	11.7 ± 3.4	8.7 ± 1.6
Linalool	94.7 ± 23.0	79.9 ± 14.7
	Without microorganisms	Without microorganisms and BD in soil
(R,R)- and (S,S)-2,3-butanediol	0.0 ± 0.0	261.1 ± 86.2
(R,S)-2,3-butanediol	0.0 ± 0.0	384.1 ± 109.2
β-Myrcene	16.5 ± 1.9	12.2 ± 2.6
Linalool	121.0 ± 32.4	115.6 ± 35.2

BD, butanediol.