Chemotaxonomic Study of Four Subspecies of Pinus nigra Arn. Grown in Common Garden Based on Essential Oil Composition

Table 2

Essential oil yields of Pinus nigra Arn. needles.

Provenance	Oil yield (%)
P1	0.24^j ± 0.01
P2	0.19^k ± 0.01
P3	0.30^g ± 0.02
P4	0.37^f ± 0.01
P5	0.41^e ± 0.03
P6	0.68^a ± 0.05
P8	0.38^f ± 0.01
P9	0.41^e ± 0.02
P10	0.51^c ± 0.05
P11	0.26^i ± 0.04
P12	0.47^d ± 0.08
P13	0.41^e ± 0.01
P14	0.46^d ± 0.03
P16	0.30^g ± 0.01
P17	0.66^b ± 0.02
P18	0.40^e ± 0.01
P19	0.27^h ± 0.02
P20	0.37^f ± 0.01

Means with different letters in the same column were significantly different at . Results are expressed as mean ± standard deviation of 3 determinations.