A juvenile seat assembly is provided for use with a vehicle seat. Methods for producing a maize plant that comprise crossing maize variety PH1DMK with another maize plant. or more, and an average particle size of 2. A surface shaded relief is produced from the local surface orientation, from an EO image, and from sun geometry associated with the EO image. A spring biasing the valve disc toward the closed position and a hydraulically operated valve closing-speed regulator reduces or eliminates slamming of the valve disc against the valve seat.