Table 4. Nitrogen uptake (NUP), nitrogen harvest index (NHI), nitrogen use efficiency for grain production (NUEg) and partial factor productivity of nitrogen fertilizer (PFP) of the varieties grown in different years since 1930s in Middle Reaches of Yangtze River in 2013 and 2014.

Variety	NUP (kg ha−1)		NHI (%)		NUEg (kg kg−1)		PFP (kg kg−1)
	2013	2014	2013	2014	2013	2014	2013	2014
SLX	138	150	33.9	53.8	29.3	28.8	26.9	28.9
AZZ	172	178	57.3	52.5	36.3	29.8	40.7	35.3
GCA	157	200	52.2	51.7	47.7	34.3	49.7	45.7
ZZA	179	175	56.9	48.8	43.9	40.6	52.0	47.2
NJ11	164	188	55.0	60.4	43.2	37.1	46.7	46.5
EZ2	149	189	56.4	55.6	48.7	36.1	47.3	44.6
GC2	172	168	52.0	58.9	52.3	47.0	59.7	52.1
SY63	186	178	57.1	52.7	46.4	40.3	57.4	47.6
TQ	202	237	57.4	57.9	44.1	29.3	58.9	45.9
IIY725	204	229	54.0	65.0	42.3	39.8	56.3	60.7
LYPJ	189	223	62.2	64.8	50.1	44.5	63.0	65.7
YLY6	208	198	59.3	57.7	46.4	50.5	62.9	66.3
HHZ	157	204	59.4	54.7	58.4	43.4	58.8	58.8
YLY1	206	248	59.1	54.4	46.1	42.0	62.4	69.1
LSD (0.05)	32	20	5.5	4.2	9.1	5.0	4.3	3.6