1. Every producer or distributor shall, within thirty days after each six-months’ period ending June thirtieth and December thirty-first, file with the director on forms supplied by him, a certificate setting forth the amount of agricultural liming materials sold by each producer or distributor for consumption or use in the state of Missouri during each such respective period. At the time of filing the certificate, each producer or distributor shall pay to the director the fee prescribed by the director by rule which fee may not exceed ten cents per ton or eleven cents per metric ton. In the event that the director has not prescribed a fee under this section, each producer or distributor shall pay a fee of four cents for each ton or four and four-tenths cents for each metric ton of agricultural liming materials sold by him during the period covered by the certificate filed under this section.

2. The amount of the inspection fee shall be added to and clearly stated on each sales statement or invoice. The fee so paid to the director shall be used for defraying the expenses in administering sections 266.500 to 266.550 and the rules promulgated under sections 266.500 to 266.550, and for practical and scientific experiments by the Missouri agricultural experiment station in the proper use of agricultural liming materials. The fee may also be used to support related research and methodology, publications and educational programs extending the results of these agricultural liming materials experiments as may be of practical use to the farmers of this state.