ARCHIVE: Fertiliser Manual (RB209)

BIOSOLIDS - total and available nutrients

Nitrogen – Typical total and readily available nitrogen content (fresh weight basis)

 

Dry matter (%)

Total nitrogen
(kg N/m3)

Readily available nitrogen
(kg N/m3)

Digested liquid

4

2.0

0.8

 

 

(Kg N/t)

(Kg N/t)

Digested cake

25

11

1.6

Thermally dried

95

40

2.0

Lime stabilised

40

8.5

0.9

Composted

60

11

0.6


To convert kg/m3 to units/1000 gallons, multiply by 9.
To convert kg/t to units/ton, multiply by 2.


Nitrogen – percentage of total nitrogen available to next crop following biosolids applications (% of total nitrogen)

 

Autumna (Aug-Oct, 450 mm
rainfall to end of March) 

Wintera (Nov-Jan, 250 mm
rainfall to end of March) 

Springa (Feb-April)

Summera use on grassland

 

Sandy / shallowb

Medium / heavyb

Sandy / shallowb

Medium / heavyb

All soils

All soils

Surface applied (i.e. not soil incorporated)            
Digested liquid

10 [15]

30 [35]

30

30

40

30

Digested cake

 10

 15

 15

 15

 15

 15

Thermally dried

 10

 15

 15

 15

 15

 15

Lime stabilised

10

15

15

15

15

15

Composted

10

15

15

15

15

15

Soil incorporated after application - 6hrs for liquids
& 24hrs for solidsc
           
Digested liquid

10 [15]

35 [40]

25

35

45

N/A

Digested cake

10

15

15

15

20

N/A

Thermally dried

10

15

15

15

20

N/A

Lime stabilised

10

15

15

15

20

N/A

Composed

10

15

15

15

15

N/A

Deep injected (25-30cm)            
Digested liquid

10 [15]

30 [35]

30

30

50

50

[use for grassland and winter oilseed rape cropping]
N/A = Not available

a. The nitrogen availability estimates assume 450 mm of rainfall (after autumn application) and 250 mm (after winter application) up to the end of soil drainage (end March). Where rainfall differs from these amounts, intermediate values of nitrogen availability should be used. For spring or summer applications, rainfall is not likely to cause movement of agronomically important amounts of nitrogen to below crop rooting depth.
b. Sandy/shallow = light sand soils and shallow soils (see Appendix 1) Medium/heavy = medium, deep fertile silt and deep clay soils. Use this category for organic and peaty soils.
c. Fresh FYM – manure which has not been stored prior to land application and has an estimated ammonium-N content of 20% (cattle and sheep FYM) or 25% (pig and duck FYM) of total N. Old FYM – manure which has been stored for 3 months or more and has an estimated ammonium-N and nitrate-N content of 10% (cattle and sheep FYM) or 15% (pig and duck FYM) of the total N.
d. The values assume incorporation by ploughing. Cultivation using discs or tines is less effective in minimising ammonia losses and intermediate values of nitrogen availability should be used.

Phosphate, potash, magnesium and sulphur (fresh weight basis)

 

DM 
(%)

Phosphate

Potasha

Total
S

Total
mg

   

Total
phosphate kg P2O5/m3

Availa-
ability %

Available
phosphate
kg P2O5/m3

Total
potash kg K2O/m3

Avail-
ability %

Available potash
kg K2O/m3

kg SO3/m3

kg
MgO/m3

Digested liquid

4

3.0

50

1.5

0.1

90

0.1

1.0

0.3

 

Kg 

P2O5/t

 

P2O5/t

K2O/t

 

K2O/t

SO3/t

MgO/t

Digested cake

25

18

50

9.0

0.6

90

0.5

6.0

1.6

Thermally dried

95

70

50

35

2.0

90

1.8

23

6.0

Lime stabilised

40

26

50

13

0.8

90

0.7

8.5

2.4

Composed

60

6.0

50

3.0

3.0

90

2.7

2.6

2.0

To convert kg/m3 to units/1000 gallons, multiply by 9.
To convert kg/t to units/ton, multiply by 2.

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