N fertilizer

Cumulative NH₃ loss^†

Emission factor

Undrained

Tile-drained

Undrained

Tile-drained

---------------kg∙ha⁻¹--------------

-----------%-----------

Corn

Control

1.22 ± 0.13 b

1.26 ± 0.12 b

-

-

Urea134

2.51 ± 0.39 ab

3.23 ± 0.20 a

0.96

1.47

Urea134 + NP

3.69 ± 1.27 a

3.95 ± 1.19 a

1.84

2.01

LSD (P ≤ 0.05)^‡

1.79

1.63

-

-

Sugarbeet

Control

0.89 ± 0.11 b

0.77 ± 0.02 b

-

-

Urea146

1.44 ± 0.09 a

1.43 ± 0.14 a

0.38

0.45

Urea180

1.51 ± 0.15 a

1.75 ± 0.14 a

0.41

0.54

LSD (P ≤ 0.05)^‡

0.35

0.46

-

-