(a) Whenever any commodities shall be sold or delivered and no special written contract or agreement shall be made to the contrary, if sold or authorized to be sold by the bushel or barrel, said bushel or barrel of such commodities shall be the weight per bushel or barrel as is generally recognized and accepted in the marketplace, and the fractional part of the bushel or barrel shall be the corresponding fractional part of the weight per bushel or barrel as is generally recognized and accepted in the marketplace for such commodity.
(b) All such commodities shall be bought or sold by actual weight unless otherwise agreed to in writing between the seller and buyer; provided, however, that any of such commodities may be sold by numerical count; and provided further, that turnips, kale, mustard and spinach salad and other vegetables customarily sold by the bunch may be sold by the bunch.
(c) The Commissioner of Agriculture and Industries, as provided under the provisions of Section 2-2-16, is authorized and empowered to promulgate rules and regulations concerning minimum weights per bushel or barrel or other type container for the sale of commodities, as is needed for the standardization of the sale of such commodities in the marketplace.