The ornamental design for a propagationtray, as shown and described.
FIG. 1 is a front perspective view of a propagation tray;
FIG. 2 is a front view of the propagation tray of FIG. 1;
FIG. 3 is a side perspective view of the propagation tray of FIG. 1;
FIG. 4 is a side view of the propagation tray of FIG. 1;
FIG. 5 is a top perspective view of the propagation tray of FIG. 1;
FIG. 6 is an enlarged detail view of area 6 circumscribed within the propagation tray of FIG. 5;
FIG. 7 is a bottom plan view of the propagation tray of FIG. 1;
FIG. 8 is a perspective view of the propagation tray of FIG. 1 is a use configuration with environment;
FIG. 9 is a perspective view of the propagation tray of FIG. 1 is a use configuration with environment; and,
FIG. 10 is a perspective view of the propagation tray of FIG. 1 in a use configuration with environment.
The dot dash broken lines in FIGS. 5 and 6 denote the boundaries of the enlargements that form no part of the claimed design. The evenly spaced broken lines in FIGS. 8, 9, and 10 depict environmental subject matter that forms no part of the claimed design.