of a reduced structural nature depending upon requirements the furrow forming element 13 is biased into engagement with the ground by a first force application member 21 and the second ground engaging element 15 is biased downwardly toward the ground by a second force application member 22 in the embodiment shown both of the force application members are formed from cylinders with a suitable fluid in most cases a hydraulic fluid applying pressure to the system within the cylinder to bias the respective element toward the ground the arrangement as shown is of the type shown in the above mentioned hatford u s pat no 4 762 075 so that it includes a furrow forming element including a first material delivery conduit a second ground engaging member including a second conduit and a packer wheel which are arranged in a row one generally behind the other and mounted from a common mounting on the frame the construction as shown herein therefore may take many of the features and components described in the above mentioned halford patent the disclosure of which can be referred to for further details of the structure disclosed herein however the arrangement as shown can also be modified in many different ways to incorporate different components and different spacings in fig3 and 4 it will be noted that for convenience of illustration each.