plz update :D

What gets me is the Red Planet has iron oxide on the surface...a smelter should yield Iron and Oxygen. It isn't that oxygen is hard to find, and an electric smelter should do the trick. So with plants, bacteria, water, and sunlight, getting a healthy loam from waste rock should be possible, thus a domed farm producing oxygen actually makes sense if it has a waste rock construction cost (and possibly consumable, too).

please put all your mods together in a collection :)

It allows you to export oxygen from a farm dome to a residential dome, or store it for later use. It is explicitly why I made this mod.

Without an explicit building to support things (to separate and compress atmospheric oxygen before feeding it into the life support grid, allowing it to be piped to a distant dome or stored for future use), it might be more accurate to reduce oxygen consumption in passage-connected domes instead, but that seems harder to code.

@mrkohl it makes it to where it makes oxygen so it isn't just a percent it is helpful because it can produce more than it used to reduce and can be piped to other domes

but... it lowers the oxygen needed... it... why is this so popular right now... i'm just confused, i don't see a point

That is true and it works on the long term with many iterations, depending of course on the crop. Most of a cabbage is edible, most of wheat is not.
On the short term, it is problematic since one carbon dioxide molecule will produce one carbon and one O2 molecule, so one of each, but breathable air requires more than 40 times more oxygen than carbon dioxide, some 20% to less than 0.5% ratio. Its manageable, of course, as part of other solutions, but it would be bit problematic on its own, requiring, say, 80 harvest seasons to reach normal levels.

Growing regular food will result in a slight Oxygen excess. Much of the Oxygen released will be absorbed again when food (starches and sugars, mostly) is consumed, but there are also significant amounts of CO2 that gets converted into indigestible plant matter, and a matching amount of excess Oxygen.

Science note: plants break down carbon dioxide CO2, producing breathable oxygen, 02.
They dont produce oxygen out of nothing, so the developers likely reasoned you need humans exhaling carbon dioxide to have an oxygen production, as well as balancing the game aspects of actually needing to produce the necessary air mass from water.

However carbon dioxide is plentiful in Mars, so producing oxygen through photosynthesis should be easy. However, this should realistically result in need of greatly decreased food production, since the carbohydrates when eaten are broken into carbon dioxide again, poisoning the colony. This is where oxygen crops come in, producing lot of plant mass which can be removed from the colony as waste.