Vehicles of second division used for transporting soil and conservation machinery and equipment-Registration fee. Not for hire vehicles of the second division used, only in the territory within a 75 mile radius of the owner’s headquarters, solely for transporting the owner’s machinery, equipment, plastic tubing, tile and steel reinforcement materials used exclusively for soil and water conservation work on farms, other work on farms and in drainage districts organized for agricultural purposes, shall be registered upon the filing of a proper application and the payment of a registration fee of $488 per annum. The registration fee of $488 shall be paid in full and shall not be reduced even though such registration is made during the second half of the registration year.