# The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021, Schedule 4: Permitted crops for the closed period

Extent: E+W

Crop
Maximum nitrogen rate (kg/hectare)
(a)Nitrogen must not be spread on crops after 31 October.
(b)An additional 50 kg of nitrogen per hectare may be spread every four weeks during the closed period up to the end of harvest.
(c)A maximum of 40 kg of nitrogen per hectare may be spread at any one time.
Oilseed rape, winter
30
Asparagus
50
Brassica
100
Grass
80
Over-wintered salad onions
40
Parsley
40
Bulb onion
40

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Source: https://www.legislation.gov.uk/wsi/2021/77/schedule/4 (the official version)
Page: https://openlegislation.uk/water-resources-control-of-agricultural-pollution-wales-regulations-2021/schedule-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.