Table 2.

Nitrogen concentration and content of shoots and roots of A. sativa and A. byzantina, as affected by growth condition x waterlogging duration interaction.

Growth conditions	Waterlogging duration (d)	Nitrogen concentration (%)		Nitrogen content (mg plant−1)
		Shoot	Roots	Shoot	Roots
		Avena sativa
Control	0	3.0 ab	2.4 a	2.7 f	1.5 f
	7	3.4 a	1.7 bc	8.9 de	4.4 e
	14	2.9 ab	1.5 cde	25.9 c	9.9 d
	21	1.8 c	1.1 def	38.5 b	11.8 c
	28	1.1 de	0.8 f	46.7 a	15.1 b
	35	1.0 de	0.8 f	49.5 a	18.9 a
Waterlogged	0	3.0 ab	2.4 a	2.7 f	1.5 f
	7	2.6 b	2.1 ab	7.1 de	2.7 f
	14	1.4 cd	1.6 bcd	9.2 de	2.9 ef
	21	1.1 de	1.1 def	10.8 d	2.7 f
	28	0.6 e	1.0 ef	7.2 de	3.1 ef
	35	0.6 e	0.9 ef	6.6 e	2.5 f
		Avena byzantina
Control	0	3.1 a	2.3 a	2.6 e	1.6 f
	7	3.6 a	1.6 bc	8.7 d	4.6 e
	14	3.0 a	1.2 cde	24.9 c	8.4 d
	21	2.0 b	1.0 de	38.3 b	12.5 c
	28	1.2 cd	1.0 de	41.8 b	20.7 b
	35	1.0 cd	0.7 e	47.3 a	22.7 a
Waterlogged	0	3.1 a	2.3 a	2.6 e	1.6 f
	7	2.9 a	1.9 ab	6.3 d	2.8 ef
	14	1.6 bc	1.5 bcd	8.1 d	3.1 ef
	21	1.2 cd	1.0 de	9.7 d	3.0 ef
	28	0.7 d	0.9 e	7.7 d	3.4 ef
	35	0.6 d	0.8 e	6.6 d	3.1 ef

Values are mean of 2 years and four replicates. For each species, means followed by the same letter within a column are not significantly different at P < 0.05, using the Tukey test.