Table 1.
Basic information about the six field experiments used in the study.
| Experiment No. | Location | Cultivar | N rate (Kg ha−1) | Sampling stage (date) | Soil classification |
|---|---|---|---|---|---|
| Experiment 1 2007 | Nanjing (31°56′N, 118°59′E) | 9915, 27123 (Japonica) | N0(0) N1(120) N2(240) N3(360) | TI(17-July) SE(29-July) PI (12-August) BT(18-August) HD(25-August) | Yellow white soil |
| Experiment 2 2008 | Nanjing (31°56′N, 118°59′E) | 27123, WXJ-14 (Japonica) | N0(0) N1(130) N2(260) N3(390) | TI(20-July) SE(01-August) PI (16-August) BT(22-August) HD(30-August) | Yellow white soil |
| Experiment 3 2009 | Nanjing (31°56′N, 118°59′E) | WXJ-14 (Japonica), LYP-9 (Indica) | N0(0) N1(120) N2(240) N3(360) | TI (19–July) SE (04–August) BT(22–August) HD (25–August) | Yellow white soil |
| Experiment 4 2013 | Wujiang (31°15′N, 120°72′E) | WYJ-19, YY-8 (Japonica) | N0(0) N1(90) N2(180) N3(240) N4(360) | TI(18-July) SE(31-July) PI (13-August) BT(20-August) HD(27-August) FL(4-September) | Clay loam soil |
| Experiment 5 2014 | Zhangjiagang (31°87′N,120°77′E) | WYJ-19, YY-8 (Japonica) | N0(0) N1(90) N2(180) N3(240) N4(360) | TI(23-July) SE(01-August) HD(29-August) | Loam soil |
| Experiment 6 2014 | Rugao (32°27′N,120°76′E) | WYJ-24 (Japonica), YLY-1(Indica) | N0(0) N1(150) N2(225) N3(300) N4(375) | TI(18-July) SE(30-July) PI(06-August) BT(16-August) HD(26-August) | Loam soil |
Rice cultivars: Wuxiangjing-14 (WXJ-14), Liangyoupei-9 (LYP-9), Wuyunjing-19 (WYJ-19), Yongyou-8 (YY-8), Wuyunjing-24 (WYJ-24), YLiangyou-1 (YLY-1).
Rice growth stages: tillering (TI), stem elongation (SE), panicle initiation (PI), booting (BT), heading (HD), flowering (FL).