(a) In order to promote, protect, further, and develop the agricultural interests of this state, the State Plant Board, after investigation and public hearing, is authorized and empowered to fix and promulgate official standards for grading and classifying any or all agricultural products grown or produced in this state and to fix and promulgate official standards for containers of farm products and to change any of them from time to time.
(b) The board, in its rules or notices promulgated under this subchapter, shall prescribe such tolerances as may be deemed necessary, permitting variations from the standards fixed under the provisions of this subchapter as are reasonably incident to the proper grading of agricultural products or to the manufacture of containers for farm products.