The ornamental design for an agriculturalcoulter, as shown and described.
FIG. 1 is a perspective view of an agricultural coulter showing my new design, the indentations being alternately concave and convex on the side shown in this FIG. 1;
FIG. 2 is a right side elevational view, the indentations being alternately concave and convex on the side shown in this FIG. 2;
FIG. 3 is a top view, a bottom view being the same as the top view of FIG. 3; and,
FIG. 4 is a left side elevational view, the indentations being alternately concave and convex on the side shown in this FIG. 4.