Table 2. Experiments and treatments.

Experiment (Year)	Treatment	Cultivar	N rate (kg N ha−1)	water regime
Exp.1(2007) & 2(2009)	V1	Nipponbare	150	water layer
	V2	Wuxiangjing 14	150	water layer
	V3	Yangdao 6	150	water layer
Exp.3(2007) & 4(2008)	N1	Wuxiangjing 14	0	water layer
	N2	Wuxiangjing 14	150	water layer
	N3	Wuxiangjing 14	300	water layer
Exp.5(2007) & 6(2008)	W1	Wuxiangjing 14	150	water layer
	W2	Wuxiangjing 14	150	wetting irrigation
	W3	Wuxiangjing 14	150	dry cultivation