Map for nitrate classes

As we have seen above data that are available for modelling nitrate leaching at various scales. However, this estimate does not provide any information on the amount of nitrogen emission to surface waters as nitrate reduction processes will take place from the root zone to the surface waters.

The Statutory Order on permission and authorisation of animal husbandry from 2007 prescribe an evaluation of the farm emission of nitrate to surface waters. In order to obtain such estimates, a nitrateclass map has been developed (figure 1). The map gives following information:

  1. For each water body shown in figure 1 the nitrate leaching was estimated for the year 1989/90, assuming that year represents the previous 10-20 years of agriculture.
    The data from the Stream Monitoring programme is used for calculating the nitrogen transport to streams of the same water bodies. This estimate is based on the annual flow weighted concentrations and a water flow corrected for climatic variations.
    The ratio between nitrate leaching and estimated corrected stream transport are taken as the nitrogen reduction percentage (figure 2).
    In catchments with no stream measurement, model estimates were employed. The procedure is described by Windolf and Tornbjerg (2009). These are of course very rough estimates.
  2. All Natura 2000-areas are mapped as either very nitrogen vulnerable or vulnerable. The very nitrogen vulnerable Natura 2000-areas are water bodies with low water with and with low water exchange. 85 pct. of the Danish area drain off to Natura 2000-areas (figure 3).

The map is used for identification of areas, where there will be a condition of reduction of the number of LU/ha (The harmony rules) when a livestock is approved.

Reduction-potential for nitrogen, pct.

Catchment area to very nitrogen vulnerable Natura 2000- areas

Catchment area to nitrogen vulnerable Natura 2000- areas

Catchment area to other areas

0 – 50

Nitrate class III: 50% of harmony rules

Nitrate class I: 85% of harmony rules

Harmony rules

51 – 75

Nitrate class II: 65% of harmony rules

Harmony rules

Harmony rules

76 – 100

Harmony rules

Harmony rules

Harmony rules

Figure 1.

Nitrate class map 
Klick image to enlarge 

Figure 2.

Nitrogen reduction map of Denmark. The percentage shows the amount of nitrate leaching from the root zone until it reaches the recipient. 
Klick image to enlarge 

Figure 3.

Natura 2000-areas which are very nitrogen vulnerable (dark blue) or vulnerable (bright). 
Klick image to enlarge

See more maps at Danmarks Miljøportal (in Danish)

New Environmental Approval Act for Livestock Holdings

  • Changes of livestock holdings >75 LU – ’IPCC’ approval
  • National minimum requirements for environmental protection (odour, ammonia, nitrates, phosphorus, landscape, etc)
  • Builds on ND, first step towards WFD

With a view to protecting ammonia-sensitive habitats designation of 300-metre buffer zones around ammonia sensitive areas. The total area where buffer zones are designated constitutes just over 7%, corresponding to just over 180,000 hectares. Within this buffer zone and within the area itself, no extension of livestock farms can take place if such an extension would lead to increased ammonia discharges in natural areas vulnerable to ammonia.

01.01.2007

Demand for reduction of ammonia emissions relative to production facility with lowest ammonia emission norm: 2007: 15%, 2008: 20%, 2009: 25%

First target 
01.01.2007

Demands for injection on black soil and grass within buffer zones (1 km from vulnerable nature).

01.01.2007

Demand for fixed cover on most new containers (depending on distance to neighbours and vulnerable nature). 01.01.2007

Reduced number of LU/ha when in Nitrate vulnerable areas (A map is showing vulnerable areas) with low denitrification capacity

Denitrifi-cation capacity, pct.

Very vulnerable recipient

vulnerable recipient

Robuste recipient

0 – 50

50 %

85 %

Harmony rules

51 – 75

65 %

Harmony rules

Harmony rules

76 – 100

Harmony rules

Harmony rules

Harmony rules

01.01.2007
Phosphorus area regulation (A map is showing vulnerable areas) 
Drained clay soil: 
P-value 4-6: Max increase of phosphorous surplus 4 kg/ha/year 
P-value > 6: Demand of a phosphorous balance 
Lowland areas: 
No increase of phosphorus surplus
01.01.2007