This amendment of the principal Act is introduced so as to answer to requirements of Council Directive 91/676/EEC of 12 December 1991 concerning the protection of waters against pollution caused by nitrates from agricultural sources. It aims at sharpening criteria for the use of fertilizers containing nitrates and thus prevents use without a precise purpose of such fertilizers. The new section 6A concerns the making of rules regarding the minimum storage space for the storage of manure. Section