8 Ill. Adm. Code 900.808
Nitrogen Credits
Section 900
Section 900.808 Nitrogen
Credits
a) Nitrogen credits shall be calculated by the livestock facility
owner or operator, pursuant to Section 900.803(m)(7) of this Part, for
nitrogen-producing crops grown the previous year, for other sources of nitrogen
applied for the growing season, and for mineralized organic nitrogen in
livestock waste applied during the previous three years.
b) Nitrogen credits shall be calculated by the livestock facility
owner or operator for the mineralized organic nitrogen in livestock waste
applied during the previous three years at the rate of 50%, 25%, and 12.5%,
respectively, of that mineralized during the first year.