Table 2.

Measurements of root traits of FM in response to low nitrogen stress.

Year		Duration	Root biomass (g)∗	Crown root number	Total crown root length (mm)	Average crown root length (mm)	Total lateral root length (mm)	Total root length (mm)	Lateral root: crown root ratio
2012	+N	142 DAT	229.9 ± 13.48, n = 10 A	80.8 ± 2.65, n = 5 A	6490.2 ± 729.71, n = 5 A	79.7 ± 6.87, n = 5 A	20926.6 ± 1752.15, n = 5 A	27415.8 ± 2363.43, n = 5 A	3.3 ± 0.20, n = 5 A
	-N	142 DAT	56.2 ± 6.07, n = 10 B	69.6 ± 7.00, n = 5 A	6365.4 ± 1102.39, n = 5 A	91.9 ± 13.96, n = 5 A	22486.1 ± 2676.98, n = 5 A	28851.6 ± 3748.96, n = 5 A	3.7 ± 0.25, n = 5 A
2013	+N	139 DAT	249.9 ± 37.26, n = 15 a	216.5 ± 27.25, n = 5 a	11134.1 ± 1124.29, n = 4 a	53.2 ± 1.71, n = 5 a	54639.1 ± 6949.32, n = 4 a	65773.2 ± 7957.09, n = 4 a	4.9 ± 0.30, n = 4 a
	-N	139 DAT	136.2 ± 26.25, n = 13 b	110.8 ± 9.05, n = 5 b	6999.8 ± 653.04, n = 5 b	64.1 ± 6.53, n = 5 a	34576.1 ± 4500.85, n = 5 b	41575.9 ± 5123.39, n = 5 b	4.9 ± 0.26, n = 5 a

Letters that are different within a year indicate that the means are significantly different (P < 0.05). Displayed values are mean±SEM.

^∗Root fresh weight was measured both years.