# The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021, Regulation 10: Maximum nitrogen limits by crop

Extent: E+W

The total amount of nitrogen permitted to be spread on any crop listed in the first column below is the figure given in the second column below, adjusted in accordance with the notes to the table and multiplied by the total area in hectares of that crop sown on the holding.
Maximum nitrogen
Crop
Permitted amount of nitrogen (kg)
Standard yield (tonne/ha)
(a)An additional 80 kg per hectare is permitted to all crops grown in fields if the current or previous crop has had straw or paper sludge applied to it.
(b)An additional 20 kg per hectare is permitted on fields with shallow soil (other than shallow soils over sandstone).
(c)An additional 20 kg per hectare is permitted for every tonne that the expected yield exceeds the standard yield.
(d)An additional 40 kg per hectare is permitted to milling wheat varieties.
(e)This is inclusive of any nitrogen that is applied as an exemption to the closed period for manufactured nitrogen fertiliser. The permitted amount may be increased by up to 30 kg per hectare for every half tonne that expected yield exceeds the standard yield.
(f)An additional 40 kg per hectare is permitted to grass that is cut at least three times a year.
Asparagus
150
n/a
Autumn or early winter sown wheat
220
8.0
Beetroot
350
n/a
Brussels sprouts
350
n/a
Cabbage
350
n/a
Calabrese
350
n/a
Cauliflower
350
n/a
Carrots
150
n/a
Celery
250
n/a
Courgettes
250
n/a
Dwarf bean
250
n/a
Field beans
0
n/a
Forage maize
150
n/a
Grass
300
n/a
Leeks
350
n/a
Lettuce
250
n/a
Onions
250
n/a
Parsnips
250
n/a
Peas
0
n/a
Potatoes
270
n/a
Radish
150
n/a
Runner beans
250
n/a
Spring-sown wheat
180
7.0
Spring barley
150
5.5
Sugar beet
150
n/a
Sugar beet
120
n/a
Swedes
150
n/a
Sweetcorn
250
n/a
Turnips
250
n/a
Winter barley
180
6.5
Winter oilseed rape
250
3.5

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Source: https://www.legislation.gov.uk/wsi/2021/77/regulation/10 (the official version)
Page: https://openlegislation.uk/water-resources-control-of-agricultural-pollution-wales-regulations-2021/regulation-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.