Soluble nitrogen measured by using test kits

1. Kemira

2. Hach

Group

N kg/ha

Group

NO3-N g/kg

N lbs/acre

N kg/ha

1

50.3

Myers

1

6

21.6

24.2

2

101.7

Corning

2

18.6

67

75

3

51.7

Corning

3

19

68.4

76.6

4

26.7

Myers

4

9.5

34.2

38.6

5

28.3

Myers

5

19.9

71.6

80.2

6

35.7

Myers

6

10.3

37.1

41.5

7

51.7

Corning

7

19

68.4

76.6

8

90.3

Corning

8

18.6

67

75

9

41.9

Myers

9

29.08

104.7

117.3

A.Inorganic nitrogen

B. Mineralizable N (anaerobic incubation)

Group

NH4-N ug/g soil

NO3-N ug/g soil

Group

Net NH4-N ug/g soil

1

5.1

5.5

1

24.9

2

4.4

25.2

2

11.4

3

4.5

24.6

3

15.5

4

1.0

1.0

4

24.4

5

5.4

5.8

5

12.5

6

5.6

8.5

6

29.6

7

3.8

23.8

7

7.1

8

4.4

25.9

8

10.6

9

3.6

24.5

9

11.0

C. Mineralizable N (hot-KCl)

D. Microbial biomass

Group

Net NH4-N ug/g soil

Group

biomass N ug/g

biomass C ug/g soil

C:N

1

15.7

1

35.0

288.0

8.2

2

7.7

2

27.7

265.4

9.6

3

4.9

3

20.8

212.0

10.2

4

6.7

4

38.2

459.9

12.1

5

7.4

5

33.6

201.0

6.0

6

8.4

6

28.3

462.0

16.3

7

3.6

7

15.9

396.6

24.9

8

10.0

8

15.5

132.2

8.5

9

35.5

9

21.7

326.0

15.0