N fertilizer

Grain yield

Undrained

Tile-drained

--------------Mg∙ha−1--------------

2012

Urea180

7.46 ± 0.81 a

8.10 ± 0.82 a

Urea224

6.84 ± 0.72 a

7.53 ± 0.92 a

Urea224 + NP

7.56 ± 1.09 a

6.42 ± 0.49 a

Split (Urea112 + UAN112)

7.71 ± 1.01 a

7.38 ± 0.37 a

LSD (P ≤ 0.05)

NS§

NS

2013

Control

5.97 ± 0.41 b

6.01 ± 0.27 b

Urea134

8.79 ± 0.37 a

8.33 ± 0.57 a

Urea134 + NP

8.65 ± 0.59 a

8.59 ± 0.68 a

Split (Urea67 + UAN67)

7.42 ± 0.19 a

7.84 ± 0.57 a

LSD (P ≤ 0.05)

1.43

0.86