| Treatments | RI | RII | RIII | Mean |
| T1 = Control (no urea) | 776.6 | 854.9 | 663.5 | 765.0 |
| T2 = Recommended urea soil applied (130 kg・ha−1) | 1969.1 | 1882.8 | 1871.8 | 1907.9 |
| T3 = 1% urea at 35 days after sowing | 2165.8 | 2211.7 | 2258.1 | 2211.9 |
| T4 = 1% urea at 60 days after sowing | 2012.3 | 2093.9 | 2115.9 | 2074 |
| T5 = 1% urea at 85 days after sowing | 1989 | 2058.9 | 2058.9 | 2035.6 |