| Treatments | RI | RII | RIII | Mean |
| T1 = Control (no urea) | 316.8 | 252.8 | 223.2 | 264.3 |
| T2 = Recommended urea soil applied (130 kg・ha−1) | 853 | 833.1 | 839.5 | 841.9 |
| T3 = 1% urea at 35 days after sowing | 1010.3 | 1053.8 | 1076 | 1046.7 |
| T4 = 1% urea at 60 days after sowing | 930.7 | 974 | 965.9 | 956.9 |
| T5 = 1% urea at 85 days after sowing | 907.9 | 928.9 | 918.7 | 918.5 |