star wars - What are these things that look like vaporators?

At the very start of Rogue One, we see several objects that look like this:

This looks very similar to a moisture vaporator from A New Hope:

Moreover, we learn that these objects are used for farming. However, it seems unlikely that the ones in Rogue One are used for moisture farming, since: (the following spoiler is extremely minor)

it rains a short time after we first see them - and the presence of mosses and very green grassland suggest that this is not a rare event in this climate. It's also worth noting that we don't see any evidence of crops or livestock, just green ungrazed grassland and bare rock.

Given this, my question is, what are these objects and what are they used for on this world? What does this farm produce?

Answer

The Rogue One: Ultimate Visual Guide identifies them as Moisture Vaporators, with the taller ones very much the same as the ones on the Lars homestead. They're needed because the atmosphere, while breathable and moist, tends to be a bit rich in metals for comfort when it comes to irrigating plants and drinking water.

In worlds with minimal water, vaporators work to condense and filter moisture from the air. The Lah'mu hydrosphere is abundant, but the zinc, chlorine, iron, cobalt, nitrogen and boron content of the soil makes the groundwater unpleasant to drink. The Ersos use hardy Pretormin Environmental GX-8 condenser units to distill water vapor from the air. The chemical content is condensed into a storage hopper, where Galen and his droids collect and reconstitute it to fill other needs.

As to what he's farming on his farm, the Visual Guide and the official novelisation are both in agreement that it's

"Crops".

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