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

Table 7

Effects of RPN on NUE and PFP.

Year	Treatment	Straw N uptake (kg/hm^2)	Grain N uptake (kg/hm^2)	Total N uptake (kg/hm^2)	NUE (%)	PFP (kg grain kg^−1N)
2010	CK	37.0	43.5	80.5 b	—	—
	N300	62.2	113.3	175.5 a	31.7 b	32.11 b
	N240	61.8	108.3	170.1 a	37.3 a	40.13 a
	RPN I	63.2	114.6	177.8 a	40.5 a	43.03 a
	RPN II	68.7	110.4	179.1 a	41.1 a	44.7 a
2011	CK	16.2	37.4	53.6 b	—	—
	N300	54.3	95.8	150.1 a	32.2 b	28.92 b
	N240	50.4	90.2	140.6 a	36.3 a	35.41 a
	RPN I	53.6	94.8	148.4 a	39.5 a	36.58 a
	RPN II	49.5	95.3	144.8 a	38.0 a	35.88 a