Three options immediately stand out: (1) Conservation Reserve Program, or CRP, (2) Environmental Quality Incentives Program, or EQIP, and (3) Illinois Forestry Development Act, or IFDA.
CRP and EQIP are USDA programs; therefore, please contact your county USDA Service Center for information on these two programs:
IFDA is a state forest management program; therefore, please contact your local IL Dept. of Natural Resources district forester, Mr. Jeff Harris (815) 273-2768.
Best of luck!