Danish rules and key values related to fertiliser and animal manure in general
and requirements related to extension of the animal production, updated to year
2010/2011.
Supplemental literature for the Agro-ecosystems master course: “Agro-ecosystem analysis and management at
Farm Scale (2015)”, see Kristensen (2015)
The written material about fertilisation rules and general requirements that have to be followed by the farmers are in
Danish, and is published by the Plant Directorate in “Vejledning om gødsknings- og harmoniregler”,
NaturErhvervstyrelsen (2014). An English summary of important parts is given her.
Contents
1. General rules for agriculture ................................................................................................................................................... 1
1.1. Plant cover and catch crops ................................................................................................................................................ 1
1.2 N quota / N norms ................................................................................................................................................................ 3
1.3. Utilisation of animal manure ............................................................................................................................................. 4
1.4. Storage and spreading time. ............................................................................................................................................... 5
2. Rules related to extension of the animal production ............................................................................................................. 9
2.1 Ammonia volatilization ..................................................................................................................................................... 9
2.2. Instruments (Virkemidler) for reducing ammonia emission..........................................................................................11
2.3 Phosphorus surplus .........................................................................................................................................................12
2.4. Instruments (Virkemidler) for reducing phosphorus leaching/runoff ...........................................................................13
2.5. Nitrate leaching – “surface water” ................................................................................................................................13
3. Litteratur. ..................................................................................................................................................................................16
1. General rules for agriculture
Ib Sillebak Kristensen, Inst. of Agroecology, Foulum, Aarhus University. Version 5. Edited: 24. Feb. 2015
1.1. Plant cover and catch crops
A catch crop, usually rape, oil radish or ryegrass, is sown for collecting nitrogen during the autumn and winter, and
must be incorporated into the soil in the spring and is always followed by a spring sown crop.
1
There are two levels of catch crops
If animal manure corresponding to more than 80 kg N/ha are applied, you have to establish catch crops in at least
14% of the ‘catch crop base area’ (see below).
If animal manure corresponding to less than 80 kg N/ha are applied, you have to establish catch
crops in at least 10% of the ‘catch crop base area’ (see below).
You must always have catch crops in at least 4% of the area, irrespective of having 100% winter crops.
There is a release of nitrogen from the incorporated catch crop, which has to be subtracted the N quota of the
following crop: 25 kg N/ha if you have 14% catch crops and 17 kg N/ha if you have 10%. (see example below)
‘Catch crop base area’
The percentage of area with catch crops is calculated from the ‘catch crop base area’, i.e., area with the following
crops: Cereals (winter or spring), peas, spring or winter rape, faba beans, maize, mustard or sunflower.
Table 1. DK norms for yield, fertilizer application and catch crop area. From Plantedirektoratet (2010)
Crop
Effect
on
next
crop
kg
N/ha
Must the Coarse sandy
effect of
(below 5
previous percent clay),
crop be
JB 1 or 3,
included not irrigated
yes/no
Fine sandy
5-10 percent
clay, not
irrigated,
JB 2 or 4
Yield,
kg
Yield,
hkg/ha* N/ha hkg/ha*
kg
N/ha
Below 10
percent clay,
irrigated.
JB 1-4
Loamy Sand
Sandy loam, Correc-tion
(10-15 percent more than 15 for yield**
clay),
percent clay,
JB 5-6
JB 7-10
kg N/ hkg
Yield,
kg
Yield,
kg
Yield,
kg
increased
hkg/ha* N/ha hkg/ha* N/ha hkg/ha* N/ha
yield
Spring barley
0
Yes
40
111
47
107
52
126
59
113
63
Compulsary catch crops 17/25
No
0
0
0
0
fil= Tabel_1_2002_2013_isk
OrgSheet=
2011
*1 hkg = 100 kg
**If a farmer can demonstrate a higher yield than the standard, he can incease the quota using these factors.
127
0
1,5
0
Example with 14% catch crop followed by spring barley:
If spring barley is sown in coarse sandy soils after incorporation of catch crops, it is not allowed to apply more than
86 kg N/ha (111 – 25 = 86) .
2
1.2 N quota / N norms
Table 2. DK norms for fertilizer application. Extracted from Table 1 in “Vejledning om gødsknings- og
harmoniregler” (Plantedirektoratet (2010) , se newest in NaturErhvervstyrelsen (2014)
Table 1. DK norms for fertilizer application, 2010/11”, Plantedirektoratet (2010)
Crop
Spring barley
Winter barley
Rye
Winterwheat
Winterwheat for bread
Winter rape
Peas
Potatoes for starch
Potatoes, fresh
Sugar beets
FMK-UK,Effect
se fil=Norm_HG_2000_2012.xlsx,
Must the Coarse
Fine
D:\ibdata\tekst\NPK\Husdyrgodning\DE\Norm_HG_2009_2010.xlsx,
Below
Loamy
Sandy
Correcse Mikkle
on effect of sandy
sandy
10
Sand
loam,
tion for
next previous (below
5-10
percent
(10-15
more
yield**
crop crop be
5
percent
clay,
percent
than 15
included percent
clay,
irrigated
clay),
percent
kg N/
clay),
not
.
JB
JB 5-6
clay, JB
kg
Yield,
kg
Yield,
kg
Yield,
kg
Yield,
kg
Yield,
kg
hkg
yes/no
N/ha
hkg/ha* N/ha hkg/ha* N/ha hkg/ha* N/ha hkg/ha* N/ha hkg/ha* N/ha increase
d yield
Vårbyg
0
Yes
40
111
47
107
52
126
59
113
63
127
1.5
Vinterbyg
0
yes
53
145
57
137
61
157
76
148
81
161
1.2
Rug
0
yes
39
109
52
109
51
121
64
113
68
125
1.2
Vinterhvede 0
Yes
55
149
69
151
73
168
87
162
92
176
1.3
Vinterhvede til 0brød
Yes
55
220
69
229
73
250
87
206
92
268
1.7
Vinterrapsfrø, 23
00
Yes
28
173
36
183
36
183
41
190
43
192
1.5
Ærter
10
No
45
0
45
0
45
0
45
0
45
0
0
Kartofler, industri
0
Yes
432
182
483
178
534
200
534
179
534
187
0.2
Spisekartofler 0
Yes
299
137
376
137
401
154
401
133
401
141
0.2
Sukker-roer 17
Yes
387
105
489
101
566
123
621
102
657
114
0.1
kg
kg
kg
kg
SFU
SFU/ha
SFU/ha
SFU/ha
SFU/ha
SFU/ha
N/ha
N/ha
N/ha
N/ha
/ha
Majs- ensilage,0 middel FK
Yes
9800
152
9800
139
10800
165
10700
143
11200 157
0
Maize for silage
20% kløver
Clover grass (below 50 Kløver-græsens., middel FK,
86
No
6500
230
percent clover)
Græs- ensilage,
Grass without clover
18 middel FK
No
7000
308
Lucerneensilage,
Lucerne- silage, low fodder
quality
86 lav FKNo
11
0
Varigt enggræs
Permanent grass
18
No
3000
130
Grønbygensilage
Wholecrop barley (beginning
of earing),
0
silage
No
2600
97
Byg- helsæd,
ensilage,
middel
FK 5400
Barley - wholcrop (early dough),
middle
0 fodder
No quality
112
helsæd,
middelfodder
FK5700quality
Wheat - wholecrop (earlyHvededoyugh),
silage,
0 ensilage,
middle
No
149
ærter
Barley - peas, silage 20%Byg-ært,
peas ensilage,
11 20% No
5600
58
Efter- wholecrop,
afgrøde,0helsæd,
ensilage 1800
Green manure (second crop),
silage
No
75
Løg fra Kålroer0
Onion
Yes
165
6700
232
8000
243
7000
235
7000
235
0
7500
13
3000
3300
6400
7300
6100
2200
-
317
0
130
96
107
150
50
77
150
9000
15
3000
3300
7100
7700
6500
2300
-
343
0
130
109
126
166
66
78
165
8000
14
3000
3600
8100
9300
6900
1900
-
325
0
130
93
113
159
48
74
140
7800
14
3000
3600
8600
9900
7200
1900
-
325
0
130
101
126
172
59
74
150
0
0
0
0
0
0
0
0
-
52
1100
52
0
6-8 cm
Compulsary catch crops Græs,
17/25
No
1000
52
1100
52
1200
53
1100
OrgFile= Tabel_1_1998_2014_isk40
OrgSheet= Norms_2011
*1 hkg = 100 kg
**If a farmer can demonstrate a higher yield than the standard, he can incease the quota using these factors.
Winter precipitation / N prognosis
The above mentioned standards are corrected (by region) for winter precipitation; corrections are
given just before the new season, and are made on the presumption that very wet winters leave less
mineral soil N for the new season. This correction, referred to as N-prognosis, is based on 150
measurements of Nmin in the Square Grid Net for Nitrate Investigation in Denmark, and associated
model calculations.
Harmony rules
The harmony rules prescribe maximum amount of animal manure to be applied per ha.
According to the EU Nitrate Directive, the general maximum level is 170 kg N/ha.
Only France is following this general rule; other countries have got exceptions for cattle farm
allowing up to 230 kg N/ha providing a minimum proportion of the area is grassland or fodder
3
crops. In Denmark the Action Plans have strengthened the rules, which only allows 140 kg N/ha for
pig slurry.
Tble 3. EU rules for N-applications,
Table
EU rules for N-application
Country
Conditions
Farms with > 70% grassland + forage crops
Denmark
Other situations, for cattle, sheep and goats
Pigs, poultry
Grass; maize followed by grass
Winter wheat+green manure crop, sugar and fodder
beets
Flanders
Legume crops other than peas and beans
1
Crops with low N demand
Other crops
Grassland (? 4 cuts or ? 3 cuts + grazing)
Application standard for
manure
Derogation
(kg total manure N /ha)
- Granted (2009- 2012)
230
- Applies to whole farm area
- Manures: cattle
170
140
250
- Granted (1.1.2007- 31.12.2010)
- Manures: cattle (except fattening calves
), horses,
goats, sheep, liquid fraction of pig slurry (these are
200
called ‘derogation manures’
)
0
125
170
230
Germany
Other situations
All situations
France
170
170
Farms with > 70% grassland
250
Netherlands
1
Other farms
Cichory, flax, carrots, shallots, onions, fruit
fil= Tabel_1_2002_2011_isk
- Granted (2006-2009)
- Applies to resp. crop acreages
- Manures: cattle
- To date, no derogation was requested
- Granted (2006-2009)
- Applies to whole farm area
- Manures: cattle (except fattening calves), horses,
170
Livestock Unit (LSU) (DK=DE) corresponds to 100 kg total N in the manure, which means the
Danish harmony rules expressed in LSU (DE) are:
Table 4. Maximum allowance of manure applications in Denmark,
LSU (DE)/ha/yr
1.4 LSU (DE)
Farm type
For pig manure it is allowed to apply manure/slurry
corresponding to a maximum of 1.4 LSU
(DE)/ha/yr.
1.7 LSU (DE)
For cattle manure the maximum limit is 1.7 LSU
(DE)/ha/yr.
2.3 LSU (DE)
Providing that more than 2/3 of the manure is cattle
manure, and the more than 70% of the area is
covered grass or fodder beets. Further, soils must
analyzed every 3rd year for content of N and P.
1.3. Utilisation of animal manure
The N fertilizer value (NFV) of manure is defined as the amount of N in the manure having the
same effectiveness as carefully applied mineral N fertilizers expressed as a percentage of total N in
the manure. The table below summarizes N fertilizer values of most frequently used manure types.
4
The values apply to the first year of application.
Table 5. Nfertilizer value of animal manure in EU countries.
Table
N fertilizer value of manure
NL
50-55
40
45-50
Recommendations
FL
GE
DK
55
70 55-70
55
70 45-55
55
70 45-50
25
Legal (Action Programme)
NL
FL GE DK
60-65
60
50 70
60-65
60
50 70
50-60
60
60
50 70
20
20
70
Arable land, spring, maize/potatoes/beets
Arable land, spring, winter wheat
Grassland, before 1st cut
70-75
55
45-55
65
65
65
60
60
60
70-75
65-70
60
60-75
60-70
50-65
60-65
60-65
60
60
60
60
60
60
60
75
75
75
Arable land, spring, maize/potatoes/beets
30
30
60
45
15-30
40
30
25
65
Arable land, spring, maize/potatoes/beets
50-55
55
50
65
45-65
55
30
30
65
Arable land, spring, maize/potatoes/beets
Liquid fraction afterArable land, spring, winter wheat
separation
Grassland, before 1st cut
85-90
70
65-75
80-90
80-90
80-90
90
90
90
85
85
85
Cattle slurry
Pig slurry
Solid cattle manure
Solid chicken
manure
Arable land, spring, maize/potatoes/beets
Arable land, spring, winter wheat
Grassland, before 1st cut
Excreted on pasture
90
85-90
75-80
FR
55
80
80
80
Solid fraction after
separation, cattle Arable land, spring, maize/potatoes/beets
25
25
55
40
65
Solid fraction after Arable land, spring, maize/potatoes/beets
50
35
55
50
65
separation, pigs
Compost
Arable land, spring, maize/potatoes/beets
10
10
10-15
10
1 values as used in underpinning of Action Program (Mestdecreet), not explicit in Action Programme
2 used for deriving a fixed NFV value for situations of grazing (45% in 2009)
3 Values based on the recommendation of Thüringen for manures produced on the. Different
farm
values apply for manures imported to the .farm
fil= Tabel_1_2002_2011_isk
1.4. Storage and spreading time.
Table 6. Periods when application of manures and chemical fertilizers is allowed in Denmark.
Bare soils
Winter crop
Winter Oil seed
winter
general
rape and grass
Liquid manures
1/2-1/61
1/2 – 1/6 1
1/2-1/10
Solid manures
1/11-1/61
No
restriction
No
restriction
Chemical fertilizers
No
restriction
No
restriction
No
restriction
1 Actually until harvest; in practice this means no later than 1/6 because manures cannot be applied
later in most crops (besides grass).
5
Table 7. Conversion from animal to animal units (LSU)
Table. Calculation of Danish Livestock Units (LSU).
Animal type
Number of
animals
for 1 AU (DE)
Cattle:
Dairy cow, Frisian size
0,75
2007
0,85
Dairy cow, light race (Jersey)
Youngsters, 0-6 months, heavy race
0,88
3,7
1,00
4,9
Youngsters, 0-6 months, light race (Jersey)
5
6,4
Youngsters, 6-28 months, heavy race
Youngsters, 6-28 months, light race (Jersey)
2
2,7
2,6
3,6
Sucler cow (below 400 kg)
2,3
2,3
Sucler cow (400-600 kg )
Sucler cow (over 600 kg)
1,6
1,4
1,6
1,4
Male calves 0-6 months heavy race
8,5
8,9
Male calves 6 mdr.-slaughter (440 kg) heavy race
Male calves 0-6 months light race
4
11,5
4,5
12,5
Male calves 6 mdr.-slaughter (440 kg) light race
5,1
8,2
Bulls for breeding heavy race
Bulls for breeding light race
Pigs:
Sows with piglets (4 weeks ~ 7,2 kg)
Piglets from 7,2 to 30 kg
Slaughter pigs from 30 to 102 kg
1,8
2,4
2,15
2,9
Animal type
2011
4,3
200
36
4,3
175
35
Number of Number
of
animals
animals
for 1
for 1 AU (DE)
AU (DE)
Poultry:
Hense for eggproduction
166
155
Slaughter chickens 32 days
3700
4500
Slaughter chickens 35 days
3000
3900
Slaughter chickens 40 days
2200
2900
Slaughter chickens 45 days
2400
310
170
820
270
2400
340
190
900
290
7
7
7
4,9
2,9
2,3
1,9
44
Turkeys females
Turkeys males
Ducks
Geese
Other types:
Sheep with lamb
Goats with 'lamb'
Horses below 300 kg
Horses 300 - 500 kg
Horses 500 - 700 kg
Horses above 700 kg
Mink
4,7
2,9
2,3
1,9
34
6
Table 7. N, P and K in animal manure, translated from Plantedirektoratet (2010)
Table. DK norm production of animal manure, 2010/2011
Animal and stable type
Manure type
Content
kg nitrogen kg phosporus kg potassium
(ab storage)
(ab storage) (ab storage)
1 dairy cow; heavy race, 9347 liter milk
Solid manure
68,5
19,6
32,5
+ urine
Slurry
55,5
136,7
2,1
21,7
94,7
127,3
Slurry
129,1
21,6
123,6
Deep litter
146,8
24
176,7
1 sow with 27,2 piglets to 7,4 kg
Individual tiedup, slatted
Slurry
15,3
3,6
6,9
Loos system, slatted
Slurry
15,9
3,6
7,4
10 piglets, 7,4 - 32 kg
Slatted
Slurry
4,3
1,2
2,9
Slurry
25,7
5,1
13,3
Tie stall
Tie stall with slurre
Bedding barn with channals
Deep Litter
10 slaugther pigs, 32 – 107 kg
Partly slatted, with 25-49% solide floor
fil= Tabel_1_2002_2011_isk
7
Table 8. N and P content of selected crops, se in Danish Møller et al. (2005)
Feed item
DM%
Cash crops
Oats
85.0
Spring barley
85.0
Winter barley
85.0
Wheat
85.0
Rye
85.0
Rice
86.0
Maize
87.5
Broadbeans
86.4
Soyabeans
90.4
Winterrapeseed
92.5
Hempseed
92.0
Peas
85.2
Concentrate
Rapeseed meal, 00, 4% fat
88.2
Soyabean meal
87.6
Sugar beet
22.0
Potatoes
24.0
Grass pellets, plus
92.0
Cane molasses (treacle)
73.0
Sunflower seed meal, partially husked
89.0
Fodder urea
Rouhage
Hay
84.0
Spring barley straw
85.0
Maize whole crop silage
34.7
Barley whole crop silage
34.0
Wheat - wholecrop (early
40.0
Wholecrop barley (beginning of
31.0
Barley - peas, silage 20% peas
33.0
Lucerne- silage, low fodder
Grass silage
Grass-clover silage
Grass grazed
Grass-clover grazed
1)
Net energy, see http://norfor.info/
2)
DTU Fødevaretabellen
43.0
36.0
36.0
17.0
17.5
Crude % N of
%
protein. % SFU Protein
of DM
of SFU
Energy
Kg feed
P
K
NEL20 1)
per
SFU
MJ pr. kg SFU per kg
g pr kg DM g per kg
DM
DM
DM
10.2
10.2
10.2
10.2
9.6
9.7
9.6
31.1
41.1
19.4
5.7
24.0
1.79
1.47
1.47
1.36
1.31
1.51
1.26
4.25
4.50
1.65
0.57
3.01
11.2
9.2
9.2
8.5
8.2
9.4
7.9
26.5
28.1
10.3
3.6
18.8
6.2
7.5
7.5
7.8
7.7
0.0
8.0
0.0
0.0
0.0
0.0
8.4
0.91
1.11
1.11
1.20
1.17
1.03
1.22
1.17
1.46
1.88
1.57
1.28
1.29
1.06
1.06
0.98
1.00
1.13
0.94
0.99
0.76
0.57
0.69
0.92
3.6
3.8
3.4
3.5
3.2
5.5
5.7
5.9
5.8
5.6
3.2
6.8
5.5
7.6
1.7
4.6
4.0
16.0
19.6
10.0
8.9
12.0
38.8
48.7
5.9
9.2
18.0
5.5
41.7
288.0
5.75
5.71
0.96
1.46
3.96
1.03
6.22
35.9
35.7
6.0
9.1
24.7
6.5
38.9
6.6
8.3
6.5
7.7
5.1
6.4
6.7
1.08
1.36
0.98
1.01
0.73
0.85
1.07
1.05
0.84
4.62
4.13
1.49
1.61
1.05
12.9
7.6
1.7
2.1
3.8
0.7
12.6
15.0
27.0
21.0
20.0
29.0
49.0
17.0
11.2
4.0
7.7
10.1
8.8
15.6
11.1
2.78
2.81
1.40
2.21
2.04
3.14
2.33
17.3
17.5
8.7
13.8
12.7
19.6
14.6
5.1
2.5
6.5
5.7
0.0
0.0
0.0
0.65
0.23
0.88
0.73
0.69
0.80
0.76
1.84
5.16
3.27
4.02
3.62
4.05
#VALUE!
2.7
0.9
2.4
2.9
2.6
3.7
2.9
22.0
20.0
11.0
17.0
13.0
30.0
16.0
18.5
16.2
17.3
22.0
24.0
4.90
3.15
3.34
3.69
3.95
30.6
19.7
20.9
23.0
24.7
0.0
5.8
6.5
6.5
6.6
0.60
0.82
0.83
0.95
0.97
3.85
3.37
3.35
6.16
5.87
3.7
3.9
3.8
3.4
4.0
31.0
30.0
29.0
29.0
29.0
fil= Norm_HG_2000_2012.xlsx
Sheet= FM K_UK
The yield of straw (85 % dry matter) is approximately 55 % of the grain yield for barley, wheat, oat,
and triticale, and 90 % for rye and rape.
8
2. Rules related to extension of the animal production
Ib Sillebak Kristensen, Dept. of Agroecology, Foulum, Aarhus University.
Foulum, Feb. 2015
The written material about the rules to follow if a farmer is applying for an extension of his production is in Danish on the
homepage of Ministry of Environment (http://www.husdyrgodkendelse.dk). An English summary of important parts is given here
in part II.
When a farmer wants to extend the animal production and send an application requirements concerning ammonia volatilization,
phosphorus surplus, and nitrate leaching have to be considered.
These requirements are shortly described below
2.1 Ammonia volatilization
The environmental assessment is carried out in three steps:



General requirements
Buffer zone requirements
Requirements related to other sensitive areas than those included in buffer zones.
General requirements
In comparison to standard emissions in 2005/06 (reference emission) an applying farm has to reduce emissions as follows:



1st January 2007: 15% reduction
1st January 2008: 20% reduction
1st January 2009: 25% reduction
In the table values for ammonia emission for individual animal types and reference stable are given after 15, 20 and 25%
reduction.
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Buffer zone requirements
Experiments have shown that deposition of ammonia decrease with the distance from the stable from where it was emitted.
Deposition, kg N/ha (9 weeks)
8
7
6
Buffer zone II
Buffer
zone I
5
4
3
2
1
0
0
200
400
600
800
1000
1200
Distance from stable, m
Figure 1. Ammonia decrease with distance from stable emission.
Two buffer zones have been defined:
Distance to vulnerable/sensitive areas < 300 m = buffer zone I
Distance to vulnerable/sensitive areas 300-1000 = buffer zone II
Buffer zone I: No increase in ammonia emission is allowed
Buffer zone II:
- If more than 2 farms (applying farm + more than 1) are in the zone emissions may increase by a maximum of
0.3 kg N/ha.
- If 2 farms (applying farm + 1) are in the zone emissions may increase by a maximum of 0.5 kg N/ha.
- If only the applying farm is in the zone emissions may increase by a maximum of 0.7 kg N/ha.
Other requirements
If other sensitive areas or plant species than those included in buffer zone requirements, the municipality can add special
requirements.
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2.2. Instruments (Virkemidler) for reducing ammonia emission




Acidification of slurry
Biological or chemical air cleaner
Cover on slurry tank
Floating barrier in slurry tank
Figure 2. Map indicating sensitive and protected areas in Denmark, incl. buffer zone I and II
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2.3 Phosphorus surplus
Requirements for P are based on calculations of P surplus (input with manure – removed with harvested crops) in the present
situation compared to the applied situation.
The requirements are depending on which P class the farm is situated in (see map below)
Table 9. P requirement dependent of P-status.
Phosphorus value1) (Pt)
Phosphorus
class
Soil type
Requirements for P surplus
0
Tile drained loamy soils Less than 4
(JB5-10), and sandy
soils (JB 1-4), which
are not tile drained or
ditched.
General requirements, no special requirements
concerning max. P surplus
I
Tile drained loamy soils 4 to 6
(JB5-10)
P surplus must not exceed 4 kg P/ha/yr
II
tile drained or ditched
sandy soils or lowland
soils with a low content
of Fe2)
Independent of Pt
P surplus must not be increased.
III
Tile drained soils (JB510)
More than 6
Must be in balance; a P surplus at 0 kg P/ha.
1) Pt is a value expressing the part of the P, which is dissolved in soil water, and therefore potential leaching risk.
2) Lowland soils with a high content of Fe are assumed to have a low leaching risk, because the P is tightly bound to Fe under
aerated conditions.
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Figure 3. Distribution of phosphorus class I, II and III
2.4. Instruments (Virkemidler) for reducing phosphorus leaching/runoff


Increase the area (bye more land)
More efficient feeding
2.5. Nitrate leaching – “surface water”
The nitrate leaching on farm level, i.e., average leaching in kg N/ha, is calculated with model www.Farm-N.dk
In Danish see Vinther et al. (2007). In English see tab= documentation after Farm-N > English > “Demo login”
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Table 10. Nitrate classes, in Danish se
http://www2.mst.dk/wiki/Husdyrvejledning.Nitrat%20%28overfladevand%29.ashx#Husdyrvejledning.Nitrat-overfladevandVurdering_FarmN_18:
Reduction potential (%) of the
nitrate on its way from root
zone to surface water:
Very sensitive or
vulnerable area
Medium sensitive or
vulnerable area
Other areas
0 - 50
0.7 LSU/ha.
1.19 LSU/ha
1.4 LSU/ha
Nitrate class 3
Nitrate class 1
Nitrate class 0
0.91 LSU/ha. Nitrate
class 2
1.4 LSU/ha
1.4 LSU/ha
Nitrate class 0
Nitrate class 0
1.4 LSU/ha
1.4 LSU/ha
1.4 LSU/ha
Nitrate class 0
Nitrate class 0
Nitrate class 0
51 - 75
76 - 100
Figure 4. Nitrate classes in Denmark. Se http://dce.au.dk/udgivelser/udgivelser-fra-dmu/dmunyt/2007/20/nkort/
Distribution of nitrate classes
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Requirements for the nitrate classes:
Nitrate class 0:
The leaching (kg N/ha) must not exceed the leaching at general harmony rules; i.e., the leaching that takes
place from animal manure corresponding to 1.4 AU (DE) for pig manure or 1.7 AU (DE) for cattle manure.
Nitrate class 1:
The leaching (kg N/ha) must not exceed the leaching that will take place at 85 % of general harmony rules;
i.e., the leaching that takes place from animal manure corresponding to 1.2 AU (DE) for pig manure or 1.4 AU
(DE) for cattle manure.
Nitrate class 2:
The leaching (kg N/ha) must not exceed the leaching that will take place at 65 % of general harmony rules;
i.e., the leaching that takes place from animal manure corresponding to 0.9 AU (DE) for pig manure or 1.1 AU
(DE) for cattle manure.
Nitrate class 3:
The leaching (kg N/ha) must not exceed the leaching that will take place at 50 % of general harmony rules;
i.e., the leaching that takes place from animal manure corresponding to 0.7 AU (DE) for pig manure or 0.85
AU (DE) for cattle manure.
Example with a pig farm where fields are in different nitrate classes; 25 % of the area in nitrate class 3 and 75 % in nitrate class
0:
The leaching (kg N/ha) from this farm must not exceed the leaching that will take place at a pig manure load corresponding to
0.7x0.25 + 1.4x0.75 = 1.225 AU.
Nitrate class 3 Nitrate class 0
(0,7 AU/ha)
(1.4 AU/ha)
Nitrate class 0 Nitrate class 0
(1.4 AU/ha)
(1.4 AU/ha)
If the area is classified as a nitrate sensitive groundwater area, the nitrate concentration in the water leaving the root zone must
not increase, if the concentration in the present situation is more than 50 mg/l.
Nitrate leaching – “groundwater”
Instruments (Virkemidler) for reducing nitrate leaching

 More catch crops than required by the general rules


 Reduced N quota
Change of standard crop rotation
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Figure 5. Nitrate sensitive groundwater areas. See http://www.baeredygtigtlandbrug.dk/nyheder/2013/04/de-nuvaerendegoedningsregler-skal-vaek-nu.aspx
3. Litteratur.
Litteraturliste
Kristensen, I. S. (2015). Rules and key values related to fertiliser and animal manure in general, updated to year 2010/2011.,
Aarhus University: 1-9.
Møller, J., Thøgersen, R., Helleshøj, M. E., Weisbjerg, M. R., Søegaard, K. og Hvelplund, T. (2005). "Fodermiddeltabel 2005, see
http://www.landbrugsinfo.dk/Kvaeg/Filer/rap112.pdf . ." Rapport nr. 112: 1-65.
NaturErhvervstyrelsen (2014). Vejledning om gødsknings- og harmoniregler. 2014/15. see
http://naturerhverv.dk/fileadmin/user_upload/NaturErhverv/Filer/Landbrug/Goedningsregnskab/Vejledning_om_goedsknings_og_harmoniregler_nyeste.pdf . , Ministeriet for Fødevarer, Landbrug og Fiskeri. NaturErhvervsstyrelsen.: 1-170.
Plantedirektoratet (2010). Vejledning om gødsknings- og harmoniregler. 2010/11. see
http://naturerhverv.dk/fileadmin/user_upload/NaturErhverv/Filer/Landbrug/Goedningsregnskab/Vejledning_om_goedsknings
_og_harmoniregler_2010_11.pdf . Ministeriet for Fødevarer, Landbrug og Fiskeri. Plantedirektoratet.: 1-123.
Vinther, F. P., Kristensen, I. S. og Jørgensen, M. S. (2007). Beregningsmetode for kvælstofudvaskning. Se www.Farm-N.dk
http://130.226.173.223/Farm-N/dokumentation/Beregning%20af%20N-udvaskning%20med%20FarmN.pdf . .
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