Short (but not 1-tick) Pulser output goes to 3 dispensers filled with bonemeal, then gets delayed slightly to a piston which pushes the farmland, breaking the fully-grown plant. No bonemeal is wasted, since the dispenser fails to fire bonemeal at a fully grown plant. Hold rightclick with a few seeds and watch as your inventory fills with wheat and more seeds!
Not as cool as a 10-timeslot multiplexer for transmission of 10 redstone states (or 10-baud binary!) down a single wire, but still good.