According to my friend Steve, a fruit collector, and a botanist, seeds that may have chlorophyll in their coat, may germinate faster if exposed to sunlight. Steve recommends sowing pitangatuba seeds just on top of the medium in extra tall pots. As Adam mentioned, pitangatubas have an extremely long taproot.
By using this technique, you may cut the germination time by one third of the "normal" method of burying the seeds. By the way, I just ordered tall pots and will transfer these seeds soon.
I use white sugar sand (pool sand sold in big home improvement stores) and plastic water bottle cuts.
Keep the sand nice and moist.