Hole-maker — serves to punch holes in rows covered with foil. The properly prepared young seedlings are put in these holes later.
version: a basic hole maker
  b hole-maker with a meter for counting quantity of holes punched (the electromechanical meter is supplied with the constant voltage of U=12V from a tractor, controlled by an inductive sensor).
All above mentioned machines have easy possibility to set their elements in order to make holes of required distance.