The Water Resources (Control of Agricultural Pollution) (Wales) Regulations 2021

Regulations 20 and 22

SCHEDULE 4Permitted crops for the closed period

CropMaximum 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(a)30
Asparagus50
Brassica(b)100
Grass(a) (c)80
Over-wintered salad onions40
Parsley40
Bulb onion40