Some Essentials of Machine Planting
If a planting machine opens up a slit deep enough and wide enough for a planter to place a tree, and closes it without air pockets, and if the slit is snugly closed with no more than a slight lip at the top the machine has done its job. The rest is the respon-sibility of the planter.
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Author(s): Earle H. Meekins
Publication: Tree Planters' Notes - Issue 58 (1963)