Table 3.
Amount of various nitrogen (N) and phosphorus (P) form losses through leaching (kg ha−1) as affected by different water and nitrogen management strategies.
| Growth stage | Index | FI | SIDS | ||||
|---|---|---|---|---|---|---|---|
| CN | U + CRF | ON | CN | U + CRF | ON | ||
| Regreening-booting | NH4+-N | 11.32 a | 8.64 b | 7.06 b | 8.58 b | 6.87 c | 5.96 c |
| NO3−N | 1.92 a | 1.26 a | 0.85 a | 1.48 a | 1.00 ab | 0.90 b | |
| DON | 1.84b | 1.38b | 2.44a | 0.95c | 1.32b | 1.72b | |
| DP | 0.23 a | 0.15 a | 0.14 a | 0.21 a | 0.16 a | 0.13 a | |
| PP | 0.10 a | 0.13 a | 0.10 a | 0.09 a | 0.08 a | 0.09 a | |
| Heading-maturity | NH4+-N | 2.51 a | 1.88 b | 1.92 b | 1.36b | 1.16c | 0.91 c |
| NO3−N | 0.91 a | 0.28b | 0.55 ab | 0.32 a | 0.26 a | 0.29 a | |
| DON | 0.88c | 1.05b | 1.45a | 0.52d | 0.58d | 0.61d | |
| DP | 0.09 a | 0.05 a | 0.08 a | 0.04 a | 0.03 a | 0.04 a | |
| PP | 0.07 a | 0.04 a | 0.07 a | 0.04 a | 0.04 a | 0.03 a | |
Note: DON, dissolved organic nitrogen; DP, dissolved phosphorus; PP, particulate phosphorus. Means within a row followed by different letters are significantly different at P < 0.05.