(a) There is allowed to eligible taxpayers who have made investments in qualified agricultural equipment in this state, a credit against taxes imposed by articles twenty-one and twenty-four of this chapter in the amount set forth in subsection (b) of this section.

(b) The amount of credit is equal to twenty-five percent of the purchase price of qualified agricultural equipment, but not to exceed $2,500 for purchases during a taxable year or the total amount of tax imposed by articles twenty-one or twenty-four of this chapter, whichever is less, in the year of purchase of qualified agricultural equipment. If the amount of the credit exceeds the taxpayer's tax liability for the taxable year, the amount which exceeds the tax liability may be carried over and applied as a credit against the tax liability of the taxpayer pursuant to article twenty-one or twenty-four of this chapter to each of the next five taxable years unless sooner used.

(c) The amount of credit for the investment in the plan or practice described in subsection (e), section two of this article is equal to twenty-five percent of the purchase price of the poultry litter certified in writing to the Tax Commissioner by the commissioner of agriculture as having been applied in the established procedure described in legislative rules promulgated by the commissioner of agriculture in accordance with the provisions of article three, chapter twenty-nine-a of this code.