Both UF ("underground feeder") and USE ("underground service equipment") may be buried directly without conduit. Whether or not you put them in conduit is up to you, but there's a lot of direct-buried UF and USE in service. Bury it deep (2 feet minimum), leave some slack and it should be trouble-free. If you have particularly rocky soil you probably want conduit. The conductors must be in conduit where they enter and exit the ground, regardless of whether they're in conduit the whole distance.
Run four conductors to each bin site (two hots, one neutral and one ground) and install a subpanel at the bins. The subpanel needs its own ground, and the ground must be separate from neutral in the subpanel. As someone else said, there's no reason not to run 240 now, even if you don't need it. Sooner or later you probably will.
How much current do you need? 100 amps is probably a good choice; a 100 amp weatherproof subpanel will have space for a half-dozen breakers. It doesn't cost that much more to run AWG 2 aluminum USE as to run AWG 12 copper UF, and you'll have much less voltage drop with the heavier cable.
Exactly how heavy your conductors need to be depends on the distance. AWG 2 aluminum is good for 100 amps for 100 feet or so. Longer distances require heavier conductors.
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