ARCHIVE: Fertiliser Manual (RB209)

Pig slurry – total and available nutrients

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

 

Dry matter (%)

Total nitrogen (kg N/m3 or /t)

Readily available nitrogen (kg N/m3 or /t)

Pig slurry - liquids

 2

 3.0

 2.2

 

4a

3.6a

2.5a

 

6

4.4

2.8

Separated pig slurry (liquid portion)

3

3.6

2.2

Separated pig slurry (solid portion)

20

5.0

1.3

a. Typical dry matter and nitrogen contents of cattle slurry are shown in bold.
To convert kg/m3 to units/1000 gallons, multiply by 9.
 


Percentage of total nitrogen available to next crop following PIG SLURRY 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

Pig slurry - liquid Surface applied (i.e. not soil incorporated)

           
- 2% DM

10 [15]

35 [40]

40

40

55

55

- 6% DM

10 [15]

 30 [35]

 35

 35

50

50

- 10% DM

10 [15]

 25 [30]

30

 30

 45

 45

Soil incorporated 6hrs after applicationc

 

 

 

 

 

 

- 2% DM

10 [15]

45 [50]

35

50

65

N/A

- 6% DM

10 [15]

40 [45]

30

45

60

N/A

- 10% DM

10 [15]

40 [45]

35

40

55

N/A

Band spread            

- 2% DM

10 [15]

35 [40]

40

40

60

60

- 6% DM

10 [15]

35 [40]

35

35

55

55

-10% DM

10 [15]

30 [35]

35

35

50

50

Shallow injected            
- 2% DM

10 [15]

40 [45]

45

45

65

65

- 6% DM

10 [15]

35 [40]

40

40

60

60

- 10% DM

10 [15]

30 [40]

40

40

55

55

Separated pig slurry - solid portion, Surface applied (i.e. not soil incorporated)

5

10

10

10

10

10

Soil incorporated 24hrs after applicationd

5

10

10

10

15

N/A

[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. The values assume incorporation by ploughing. Cultivation using discs or tines is less effective in minimising ammonia. Where slurry has been applied in spring or summer and incorporated more quickly than 6 hours or has been deep injected, nitrogen availability will be similar to the shallow injected values.
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.

For separated cattle slurry (liquid portion), use the values for 2% dry matter slurry.

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

 

DM(%)

Phosphate

Potasha

Total S

Total Mg

   

Total
phosp-
hate kg P2O5/t

Availab-ility %

Available phosp-
hate
kg P2O5/t

Total
potash kg K2O/t

Availab-ility %

Avail-
able potash
kg K2O/t

kg SO3/t

kg
MgO
/t

Pig slurry - liquid

2

1.0

50

0.5

2.0

90

1.8

0.7

0.4

 

4

1.8

50

0.9

2.4

90

2.2

1.0

0.7

 

6

2.6

50

1.3

2.8

90

2.5

1.2

1.0

Separated 
Pig slurries
(liquid portion)

 3

 1.6

 50

 0.8

 2.4

 90

 2.2

 ND

 ND

Separated 
Pig slurry
(solid portion)
 

20

4.6

50

2.3

2.2

90

2.0

ND

ND

ND = No data
For further information on the major nutrient content of cattle slurry from organic farms, see Booklet 4 of Managing Livestock Manures series (see Section 9).

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

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