The mass of plants growth is roughly the mass of water absorbed plus carbon from the atmosphere, minus water evaporated from leafs. The nutrients from the soil don't adhere to much.
That's to say, farms basically convert water to food and CO2 to O2. I'd say this is the water well spent.
That's to say, farms basically convert water to food and CO2 to O2. I'd say this is the water well spent.