Table 4.

Nitrogen uptake at the heading stage (TN_HD), nitrogen uptake during grain filling period (TN_GF), nitrogen uptake at maturity (TN_PM), nitrogen use efficiency for grain production (NUEg), nitrogen use efficiency for biomass production (NUEb), and nitrogen harvest index (NHI) of the varieties in 2014 and 2015 at Wuxue County, Hubei Province, China.

Variety	TNHD (kg ha−1)	TNGF (kg ha−1)	TNPM (kg ha−1)	NUEg (kg kg−1)	NUEb (kg kg−1)	NHI (%)
2014
HY549	173	−4.3	169	60.9	111	70.9
HLY858	137	35.4	172	55.6	101	71.6
JKY651	166	−0.7	166	57.2	105	71.6
9Y6H	156	9.0	165	59.0	108	72.9
HLY630	146	10.3	157	57.3	103	75.0
RFY41	130	32.3	162	55.6	98	71.5
RY225	113	36.6	150	58.4	100	74.6
WYH1573	132	29.1	161	58.2	102	69.5
QY982	131	28.8	160	62.0	109	75.8
YLY6	128	24.7	153	60.8	110	75.4
HHZ	121	28.7	149	57.1	100	71.3
GLY5	125	19.8	144	56.8	108	72.8
HY73	111	47.0	158	55.6	103	70.1
ZZ14	125	29.5	154	52.2	95	70.7
YG29	102	44.5	146	35.2	92	50.9
LSD (0.05)	29	36.5	18.4	5.0	7.6	4.5
2015
YY4949	164	36.0	200	56.4	94	70.8
HY549	167	24.9	192	54.1	106	62.2
CY5727	177	32.8	210	49.9	97	62.8
JY225	164	19.5	184	49.5	89	63.5
YY278	161	34.4	195	53.1	104	63.8
LLYHZ	159	23.5	182	52.2	105	63.5
HLY630	155	21.9	177	58.4	103	70.5
MLY143	167	20.4	187	54.0	100	66.7
LY10	156	37.1	193	50.3	94	64.3
HHZ	165	12.0	177	47.3	94	62.5
JY959	175	17.7	193	51.6	101	65.9
ZH1	187	22.3	209	45.8	100	57.8
HLY7185	150	27.1	177	49.4	94	62.8
HH1709	159	−0.7	158	52.1	101	62.6
SY108	162	21.1	183	52.0	99	62.5
YLY6	174	2.4	177	51.7	105	64.8
HLY1511	153	19.8	172	50.5	99	63.8
WSSM	163	24.6	188	43.1	92	57.5
LSD (0.05)	28	34.4	30	5.2	7.9	3.9