that was in commercial agronomic use prior to
January 1, 1992, with respect to which after
January 1, 1992, the distributor or seller of the substance or mixture has made no specific claim of prevention or hindering of the process of nitrification, denitrification, ammonia volatilization
3
So in original. Probably should be followed by “, or”.
urease production regardless of the actual use or purpose for, or future use or purpose for, the substance or mixture.