22.—(1) No person may spread manufactured nitrogen fertiliser on land during the following periods (all dates inclusive)—
(a)in the case of grassland, from 15 September to 15 January, or
(b)in the case of tillage land, from 1 September to 15 January.
(2) Spreading fertiliser during these periods is permitted on the crops specified in the Table in Schedule 4, provided that the maximum rate in column 2 is not exceeded.
(3) Spreading during those periods on crops not in Schedule 4 is permitted on the basis of written advice from a person who is a member of the Fertiliser Advisers Certification and Training Scheme.