01-22-2020, 10:40 PM | #21 | |
Join Date: May 2010
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Re: Sci-Fi World-building: Mars the farm planet?
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01-22-2020, 11:00 PM | #22 |
Join Date: May 2010
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Re: Sci-Fi World-building: Mars the farm planet?
Also, could some plants—perhaps genetically engineered ones—survive in a mostly-CO2 atmosphere derived from melting Mars' (dry) ice caps?
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01-23-2020, 12:07 AM | #23 |
Join Date: Oct 2005
Location: Ronneby, Sweden
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Re: Sci-Fi World-building: Mars the farm planet?
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01-23-2020, 07:41 AM | #24 |
Hero of Democracy
Join Date: Mar 2012
Location: far from the ocean
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Re: Sci-Fi World-building: Mars the farm planet?
On the amount of nitrogen, you "only" need about 60% of an earth atmosphere. You've got to stack twice and a half as much on any given spot, but mars has about a quarter of the surface area as earth.
But that's not a farming problem, that's a terraforming problem, and some neo-emperor or the other already spent the stupid amount of money to get you there. You've on a planet mostly terraformed but with too much CO2 where mars is, how do you profit off the former crazy whale's extravagance?
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01-24-2020, 12:52 AM | #25 |
Join Date: Oct 2005
Location: Ronneby, Sweden
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Re: Sci-Fi World-building: Mars the farm planet?
If you have liquid surface water in a mostly CO2 atmosphere it will have significantly lower pH than on earth as the CO2 dissolves and form carbonic acid. Don't know what pH will be when the oceans are saturated as what I've read is about earth with 0.04% CO2.
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01-24-2020, 04:30 AM | #26 |
Join Date: Jan 2005
Location: Gothenburg, Sweden
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Re: Sci-Fi World-building: Mars the farm planet?
It depends on the partial pressure of CO2 and the temperature.
There's a table here: https://en.wikipedia.org/wiki/Carbonic_acid But genetic engineering can probably overcome the pH problem.
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01-24-2020, 10:35 AM | #27 | |
Join Date: Dec 2006
Location: Meifumado
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Re: Sci-Fi World-building: Mars the farm planet?
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Source: My visit to Sakurajima volcano, and a tourist sign showing a diagram of revegetation. 30 years for grasses to colonise bare rock, 80 years for low shrubs, 100 years for tall trees, 200+ years for so-called "climax forest" (mature, steady state growth).
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01-24-2020, 02:17 PM | #28 | |
Join Date: May 2005
Location: Oz
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Re: Sci-Fi World-building: Mars the farm planet?
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You can grow plants in sand or vermiculite if you pour on enough water and fertilisers, but you have to keep them out of the rain. That's essentially hydroponics, not agriculture. Of course futuristic designer crops could well be deep-rooted perennials that you run a header over but don't plough in and re-plant over.
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01-26-2020, 05:13 PM | #29 | |
Join Date: May 2010
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Re: Sci-Fi World-building: Mars the farm planet?
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02-12-2020, 08:57 AM | #30 |
Join Date: Aug 2004
Location: Pacheco, California
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Re: Sci-Fi World-building: Mars the farm planet?
The why is simple. Somebody nukes Morocco and Earth no longer grows food.
https://en.wikipedia.org/wiki/Peak_phosphorus
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