The ornamental design for a mowerdeck grass clippingretention apparatus, as shown and described.
FIG. 1 is a bottom perspective view of the mower deck grass clipping retention apparatus, showing my new design, where the dotted lines represent unclaimed environmental structure;
FIG. 2 is another bottom perspective view of the mower deck grass clipping retention apparatus shown in FIG. 1, where the dotted lines represent unclaimed environmental structure;
FIG. 3 is a bottom plan view of the mower deck grass clipping retention apparatus shown in FIG. 1, where the dotted lines represent unclaimed environmental structure;
FIG. 4 is a top plan view of the mower deck grass clipping retention apparatus shown in FIG. 1, where the dotted lines represent unclaimed environmental structure; and,
FIG. 5 is a right side view of the mower deck grass clipping retention apparatus shown in FIG. 1, where the dotted lines represent unclaimed environmental structure.