Seed drill

Claim 1

In a seed drill having a frame, reservoirs for materials, means mounting the sowing shares on the frame including parallelogram holders, at least two separate inlets and outlets for the two different materials from the reservoirs, and a pressure roller behind each sowing share along the direction of travel, and wherein variable amounts of first material are conveyed to a forward outlet and of the second material to a rear outlet through separate channels inside the sowing shares for application in the soil, with the outlets separated along the direction of travel, and wherein each sowing share has a narrow ripping structure on the lower edge thereof to rip up the soil and produce a furrow having side edges, the improvement comprising: means for expanding the side edges of the furrow, said means including an upwardly extending portion received within downwardly opening recess in each sowing share, and removable transverse in means extending through said upwardly extending portion to releasably mount said expanding means, said expanding means extending down into the furrow and positioned in the vicinity of the rear outlet of each sowing share, wherein the expanding means is wider than the ripping structure and has a bottom end which is higher than the bottom of the ripping structure and wherein the means for expanding when mounted is positioned to effect the deposit of second material from the rear outlet on top of the first material with soil therebetween in a wider ribbon-like distribution than the first material and when removed permits the second material to be deposited directly on top of the first material.