All moneys received from the assessment imposed by this act, including any fines and forfeitures collected under the provisions of this act, shall be forthwith deposited as received with the State Treasurer and maintained by him as a special account entitled "Sweet Potato Assessment Account." Moneys credited to such special accounts shall be appropriated and used only for the following purposes:
(a) Cost of administration and collection of the tax.
(b) Programs of marketing, grading, promotion and research for the benefit of the sweet potato industry which may from time to time be conducted or approved by the commission. This money shall be spent on the above mentioned programs in approximate proportion to the needs of the industry.