the restriction of the use of external inputs; where external inputs are required or the appropriate management practices and methods referred to in point (f) do not exist, the external inputs shall be limited to:
srian a bheith ar úsáid ionchur seachtrach; i gcás ina bhfuil gá le hionchuir sheachtracha nó mura bhfuil ann do na cleachtais agus modhanna bainistíochta iomchuí dá dtagraítear i bpointe (f), beidh na hionchuir sheachtracha teoranta dóibh seo a leanas: