Yes, CRP payments are taxable but Self Employment tax may or may not apply. After you have entered the amount in the 1099-G section, review the Ag Programs section just below there in the Farm Income and Expenses section. Carefully read the interview, then TurboTax will enter the taxable portion on 4b and determine if SE tax applies.
It can also be done in the forms mode, but I recommend the Ag Programs interview first.
