N source

Total N-rate

Soil pH

Soilorganic matter

Total C

Total N

NH₄-N

NO₃-N

lb N/acre

g∙kg⁻¹

mg∙kg⁻¹

None

0

6.1b^z

18.5b

23.6b

2.1a

0.31b

6.7c

Urea

90

6.0b

18.0b

21.6b

1.8b

0.49b

14.6b

Urea

180

6.0b

19.6a

33.4a

1.3c

2.29a

20.2a

PPB

90

6.5b

19.7a

23.3b

1.8ab

0.18b

1.6d

PPB

180

6.2b

19.4a

36.0a

1.1c

0.27b

2.1d

P value

0.1112

<0.0001

<0.0001

0.0001

<0.0001

<0.0001