64 * 64 platform

function rowplant()
 for i = 1, 64 do
  if turtle.getItemCount(curslot)==0 then
   curslot = curslot+1
   turtle.select(curslot)
  end
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
 end
end
function left()
 turtle.turnLeft()
 turtle.forward()
 turtle.turnLeft()
end
function right()
 turtle.turnRight()
 turtle.forward()
 turtle.turnRight()
end
function plantall()
rowplant()
 for i = 1, 32 do
  left()
  rowplant()
  right()
  rowplant()
 end
end
curslot = 1
plantall()