TABLE 3.

Effects of N rate and time on grain filling characteristics parameters of maize grains.

Year	N	T	A	B	C	R 2	T max	W max	G max	G ave	AGP
2019	N0		20.96c	145.51a	0.135a	0.997	36.89a	10.48c	0.71d	0.34c	44.44a
	N1	T1	25.29b	94.92bc	0.130a	0.988	35.02ab	12.64b	0.82c	0.42b	46.15a
		T2	25.39b	111.87ab	0.132a	0.990	35.74ab	12.70b	0.84bc	0.41b	45.45a
	N2	T1	29.13a	79.06cd	0.130a	0.999	33.62b	14.57a	0.95a	0.49a	46.15a
		T2	28.29a	73.32cd	0.129a	0.999	33.29b	14.14a	0.91ab	0.47a	46.51a
	N3	T1	28.95a	56.25d	0.120a	0.999	33.58b	14.48a	0.87bc	0.48a	50.00a
		T2	29.29a	64.15cd	0.124a	0.998	33.56b	14.65a	0.91ab	0.48a	48.39a
	N		**	**	ns		**	**	**	**	**
	T		ns	ns	ns		ns	ns	ns	ns	ns
	N*T		ns	ns	ns		ns	ns	ns	ns	ns
2020	N0		20.47c	86.06a	0.129a	0.993	34.59a	10.24c	0.66d	0.34c	46.76b
	N1	T1	25.67b	51.12b	0.113ab	0.992	34.80a	12.83b	0.72c	0.41b	53.65ab
		T2	25.80b	58.95b	0.116ab	0.994	35.20a	12.90b	0.74bc	0.41b	52.15ab
	N2	T1	29.52a	48.65b	0.113ab	0.993	34.30a	14.76a	0.84a	0.48a	53.00ab
		T2	28.54ab	45.59b	0.112ab	0.991	33.95a	14.27ab	0.80ab	0.47a	53.41ab
	N3	T1	28.66ab	41.45b	0.113ab	0.989	33.14a	14.33ab	0.81ab	0.47a	53.47ab
		T2	31.03a	40.64b	0.106b	0.986	34.94a	15.51a	0.82a	0.49a	56.95a
	N		**	**	*		ns	**	**	**	*
	T		ns	ns	ns		ns	ns	ns	ns	ns
	N*T		ns	ns	ns		ns	ns	ns	ns	ns

A, B, C represent equation coefficients; R², correlation coefficients.

T_max, the day reaching the maximum grain filling rate; W_max, grain weight increment achieving maximum grain filling rate; G_max, maximum grain filling rate; G_max, average grain-filling rate; AGP, active grain-filling period.

**Significant differences at p < 0.01; *significant differences at p < 0.05; ns indicates non-significant difference. Different letters indicate significant differences at p < 0.05.