4 The Commodity Board is authorized in relation to the powers granted to it by section 3 with respect to the marketing of asparagus in interprovincial and export trade to make orders fixing, imposing and collecting levies or charges from persons situated in the Province of Ontario who are engaged in the production or marketing of asparagus and for such purpose classifying such persons into groups and fixing the levies or charges payable by the members of the different groups in different amounts, and the Commodity Board may use such levies or charges for its purposes, including the creation of reserves, and the payment of expenses and losses resulting from the sale or disposal of asparagus and the equalization or adjustment among producers of asparagus of moneys realized from the sale thereof during such period or periods of time as it may determine.