N source

Total N-rate

Soil pH

Soil organic matter

Total C

Total N

NH₄-N

NO₃-N

kg ha⁻¹

----------------- g kg⁻¹ ---------------

------- mg kg⁻¹ --------

None

0

6.2b^z

17.8b

22.4c

1.8b

1.63a

7.2c

Urea

90

5.8c

17.4b

23.8bc

1.8b

1.29ab

46.4a

Urea

180

5.7d

18.0b

32.0a

1.1c

0.40cd

28.0b

Pelleted papermill biosolids (PPB)

90

6.1b

17.5b

21.9c

1.9c

0.62bcd

4.4c

PPB

180

6.4a

19.4a

35.0a

1.0c

0.11d

3.8c

P-value

<0.0001

0.0278

<0.0001

<0.0001

0.020

<0.0001