a discharge mouth 137 from which the seeds emerge and fall down into the slit opening the discharge mouth 137 is near the bottom of the knife blade whereby the seeds are deposited more or less at the bottom of the slit opening the conduit 135 is shown in the rear view of the seeder fig1 and in the opposite side elevational view to fig1 fig1 the upper end of the conduit terminates at a port 138 into which the flexible hose can be secured the knife blade has an over surface 139 and an under surface 140 these surfaces are respective flat planes which meet at a line that line being the knife edge 142 the blade is generally triangular in cross section in that the surfaces 139 140 slope back from the knife edge to a maximum thickness of the blade at the back side 136 thereof the conduit 135 is accommodated within the thickness of the back side of the blade fig1 is a cross section of the blade 134 and shows the dimensions thereof the fig1 cross section is taken in a plane at right angles to the knife edge the dimension 143 is the distance between the over surface 139 and the under surface 140 at the back side if the blade which in this case is 32 mm and dimension 145 is the distance from the knife edge 142 to the mid point of the conduit 135 which in this case is 70 mm the conduit 135 has an internal diameter if 24 mm the angle between the over surface 139 and the under surface 140 in the cross section at right angles.