TABLE 1.

Effect of nitrogen fertilization level on grain yield component and sink capacity between two maize hybrids in 2015 and 2016.

Year	Genotype	N level	KNP	TKW	GY	SC	NPF	TNF
			(ear–1)	(g)	(kg ha–1)	(g m–2)	(No.)	(No.)
2015	XY335	N0	335 ± 13.5d	233 ± 3.3e	5445 ± 31.8f	626 ± 33.1f	478 ± 1.1e	396 ± 11.7d
		N150	410 ± 4.4c	271 ± 4.5c	8992 ± 48.0d	940 ± 6.0d	698 ± 4.7c	500 ± 10.8c
		N300	505 ± 13.0a	286 ± 3.6b	12313 ± 28.8a	1258 ± 14.4a	760 ± 7.2a	601 ± 3.5a
	ZD958	N0	336 ± 4.8d	253 ± 1.3d	6073 ± 33.3e	681 ± 7.7e	472 ± 4.4e	389 ± 7.7d
		N150	415 ± 12.6bc	283 ± 1.3b	9568 ± 82.9c	999 ± 10.3c	662 ± 8.8d	499 ± 12.2c
		N300	432 ± 16.0b	315 ± 4.5a	11387 ± 19.0b	1184 ± 20.3b	717 ± 8.3b	565 ± 11.0b
2016	XY335	N0	321 ± 16.0d	229 ± 0.5f	4778 ± 52.5f	588 ± 28.1f	538 ± 4.0d	384 ± 4.6d
		N150	460 ± 12.0bc	280 ± 1.9d	8984 ± 23.4d	1068 ± 20.1d	727 ± 9.0b	539 ± 4.2c
		N300	535 ± 10.1a	328 ± 2.3b	12627 ± 35.6a	1438 ± 12.2a	771 ± 5.9a	633 ± 17.0a
	ZD958	N0	312 ± 2.0d	273 ± 1.6e	5485 ± 50.4e	681 ± 6.8e	524 ± 5.3d	360 ± 20.0d
		N150	449 ± 1.2c	317 ± 2.3c	9602 ± 69.4c	1128 ± 16.7c	675 ± 14.5c	518 ± 28.0c
		N300	480 ± 16.0b	340 ± 3.7a	11836 ± 39.3b	1339 ± 25.3b	702 ± 19.0bc	590 ± 19.7b
ANOVA	Year (Y)		***	***	NS	***	***	*
	Nitrogen (N)		***	***	***	***	***	***
	Genotype (G)		***	***	*	*	***	***
	N × G		***	NS	***	***	***	NS
	Y × N × G		***	NS	***	NS	***	**

KNP, Kernel number per ear^–1; TKW, 1,000-kernel weight; GY, Grain yield; SC, Sink capacity; NPF, Number of pollinated florets; TNF, Total number of florets. N0, N150, and N300 indicate 0, 150, and 300 kg ha^–1 N applied, respectively.

Different letters indicate significant differences between treatments at a 5% level.

*, **, and *** indicate different significance at 5, 1, and 0.1% level, respectively.

NS, no significance.