4.—(1) Chemical fertiliser shall not be applied to land between the dates specified in sub-paragraph (2) in relation to that land.
(2) The dates specified for the purposes of sub-paragraph (1) are—
(a)in the case of grassland, 15th September in any year and 1st February in the following year; and
(b)in the case of other land, 1st September in any year and 1st February in the following year.
(3) The prohibition in sub-paragraph (1) shall not apply where, taking into account the characteristics of the crop and soil, the nitrogen requirement of the crop between the dates specified in sub-paragraph (2) can only be met by applying fertiliser between those dates.