ARCHIVE: Nitrate Vulnerable Zones (NVZs) - Guidance for Farmers - Implementing the rules - scope, timing and enforcement (Leaflet 2 - PB12736b)

3. What is nitrogen fertiliser?

The NVZ rules affect the management of nitrogen fertiliser on farms. Nitrogen fertiliser includes all materials applied to land that contain nitrogen compounds. It includes manufactured  nitrogen fertiliser, and all types of organic manure, including livestock manure (see Figure 2).

Figure 2 – Nitrogen fertilisers


It is important to read the description of the rules carefully to identify which of the different types of nitrogen fertiliser are affected by the rule in question. For example, rules can apply to:

  • all types of nitrogen fertiliser,
  • manufactured nitrogen fertiliser only, or
  • organic manures only or certain types of organic manure (e. g. the livestock manure N farm limit applies to all ‘livestock manure’ whereas the closed period applies to all ‘organic manure with high readily available N’).
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