CCC shall, subject to the availability of funds:
(a) Share up to 50 percent of the cost with participants of establishing eligible practices specified in the conservation plan at the levels and rates of cost-sharing determined in accordance with the provisions of this part; and
(b) Pay to the participant for a period of years not in excess of the contract period an annual rental payment, including applicable incentive payments, in such amounts as may be specified in the CRP contract.