13.—(1) In calculating the overall quantity of nitrogen fertiliser which may be applied in accordance with these Regulations, the percentage of nitrogen taken up by the crop from any given quantity of livestock manure shall be calculated in accordance with table 4 of Schedule 3, using the appropriate figures for manure type, method of application, total nitrogen content of the manure, percentage of dry matter in the manure and soil type.
(12) Notwithstanding paragraph (1) the percentage of nitrogen shall be no less than the relevant figure in table 5 of Schedule 3.