Regulating N Application for Rice Yield and Sustainable Eco-Agro Development in the Upper Reaches of Yellow River Basin, China

Table 5

NO₃⁻-N accumulative leaching at rice growth stages (kg·ha⁻¹).

Year	Treatment	Growth stage
		Seedling stage	Tillering stage	Booting stage	Flowering stage	Heading stage	Harvest stage	Sum
2010	CK	1.52 d	5.31 d	1.34 c	0.56 d	0.22 d	0.09 e	9.04 d
	N300	9.03 a	15.74 a	6.37 a	2.82 b	1.07 c	0.53 c	35.49 a
	N240	6.02 b	10.97 b	5.48 b	2.21 c	0.84 c	0.29 d	25.81 b
	RPN I	3.92 c	8.12 c	5.21 b	1.94 c	1.87 b	1.02 b	22.08 c
	RPN II	3.62 c	6.12 d	6.35 a	3.41 a	2.54 a	1.21 a	23.25 bc
2011	CK	0.81 d	2.12 e	1.45 d	1.28 e	0.52 d	0.17 d	6.35 d
	N300	7.02 a	12.84 a	5.21 a	2.52 c	1.45 c	0.98 b	30.02 a
	N240	4.83 b	10.84 b	4.76 ab	1.83 d	1.12 c	0.35 c	23.73 b
	RPN I	2.73 c	7.08 c	3.61 c	3.23 b	2.14 b	0.84 b	19.63 c
	RPN II	2.47 c	5.21 d	4.38 b	4.98 a	3.67 a	1.69 a	22.4 b