Ill. Admin. Code tit. 35, § 570.206
d) Harvest when the forage is at the proper state of maturity for maximum quality feed. No harvesting shall occur after September 15. Use the following guide for cutting stages and minimum cutting height for the species seeded:
f) To prevent excess organic solids from entering the field application area:
The following operation and maintenance criteria shall apply as best management practices to all runoff field application systems: