Soil - Revision history

Michel Lamontagne at 18:22, 20 October 2023

2023-10-20T18:22:58Z

Michel Lamontagne: /* Regolith use for soil minerals */

2022-03-08T16:00:07Z

Regolith use for soil minerals

Michel Lamontagne at 15:53, 8 March 2022

2022-03-08T15:53:06Z

Kee.nethery: /* See also */

2021-10-18T21:59:46Z

Kee.nethery: add See also.

2021-10-18T21:59:10Z

add See also.

Michel Lamontagne: /* Open issues */

2019-06-09T17:11:51Z

Open issues

Michel Lamontagne: /* Biological stability */

2019-06-09T17:08:05Z

Biological stability

Michel Lamontagne: /* Why soil? */

2019-06-09T16:29:07Z

Why soil?

Jburk at 20:48, 17 December 2018

2018-12-17T20:48:03Z

Rfc: /* Artificial soil */ link fixed

2013-10-02T07:17:53Z

Artificial soil: link fixed

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 ==Why soil?==
-A Martian colony may start with a [[greenhouse]] based upon [[hydroponics]], which allows intensive food production right from the beginning. But there are a few advantages in having a small garden with soil, too.
+A Martian colony may start with a [[greenhouse]] based upon [[hydroponics]], which allows intensive food production right from the beginning. But there are many advantages in having soil based agriculture as well.
-*It can serve as an experimental place for breeding food plants that are not suitable for hydroponics. Later, when bigger greenhouses are built, the garden can be extended to provide a valuable part in the food production. Also, it might be safer to have an alternative production method, as an epidemic plant disease is more likely to occur in a hydroponic monoculture than in a mixed natural plantation.
+*Some plants do not grow well hydroponically.
-*It provides some pleasure and has some psychological value. The settlers may want to have a piece of nature for recreation. Although this is terrestrial thinking, the Martian settlers will remain [[human]]s after all.
+*Monoculture in hydroponic greenhouses is sensitive to contamination and epidemic plant disease.
-*It allows other (i.e. more natural) types for water and air recycling, which may require less effort for maintenance. However, this must be a rather big garden to fulfill such tasks.
+*Soil based agriculture can provide a more comfortable environment than industrial hydroponics.
 *A sterile habitat may have a devastating effect on the [[immune system]] of the settlers and their [[children]]. Our physiology was forged in a dirty environment, and there are already theories about the growing number of [[allergy|immune mediated diseases]] in the industrial countries, claiming that the urban living conditions with the low numbers of natural germs put the immune system out of balance.
 *Hydroponics are fairly complex and can fail dramatically due to infestations, fungi, algae growth and mineral deficiencies.  Large amounts of soil may eventually be more stable and secure.
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 ==Artificial soil==
-Soil can not be made artificially, but a kind of pre-soil can be made to speed up the development of real soil. In botanical nurseries the pre-soil is a mixture of sand, clay and shredded [[Waste biomass recycling|organic waste]]. It does not contain substantial living parts, such as microbes and insects. The addition of [[compost]] and [[fertilizer]] would be a great enhancement.
+Soil cannot be made artificially, but a kind of pre-soil can be made to speed up the development of real soil. In botanical nurseries the pre-soil is a mixture of sand, clay and shredded [[Waste biomass recycling|organic waste]]. It does not contain substantial living parts, such as microbes and insects. The addition of [[compost]] and [[fertilizer]] would be a great enhancement.
 After placing the pre-soil in an environment with living plants and natural soil the pre-soil is transformed to natural soil by immigration of microbes, insects and plant roots. The pre-soil provides a good structure and nutrients for those immigrants.

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 ==Regolith use for soil minerals==
-A large part of the mass of soil are minerals
+A large part of the mass of soil are minerals such as sand, rock and clays.  Martian regolith is the expected source for these minerals. Martian regolith is contaminated with perchlorates, that need to be washed out before the regolith can be incorporated into soil.  Dilution with water is an effective way of washing the regolith, while the water itself might be cleaned of the perchlorates using revere osmosis systems.
 ==Open issues==

← Older revision		Revision as of 15:53, 8 March 2022
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	Since soil is complex and not fully understood, in particular its very complex biome, entirely artificial soil does not exist. However, it should be possible to bring from the Earth significative 'seed' soils, that can serve to colonise and enrich artificial soils.		Since soil is complex and not fully understood, in particular its very complex biome, entirely artificial soil does not exist. However, it should be possible to bring from the Earth significative 'seed' soils, that can serve to colonise and enrich artificial soils.

		+	==Regolith use for soil minerals==
		+	A large part of the mass of soil are minerals
	==Open issues==		==Open issues==

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 == See also ==
 * [[Surface composition]]
 == References ==
 [[Category:Biospherics]]
 <references />

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 *What species (microbes and insects) are necessary for a functioning symbiosis with plants?
 *How long does it take to develop soil from pre-soil (under Martian conditions with regolith as the mineral part)? An [[Experimental setup#soil production|experiment should be carried out]].
 == References ==
 [[Category:Biospherics]]
 <references />

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 *A sterile habitat may have a devastating effect on the [[immune system]] of the settlers and their [[children]]. Our physiology was forged in a dirty environment, and there are already theories about the growing number of [[allergy|immune mediated diseases]] in the industrial countries, claiming that the urban living conditions with the low numbers of natural germs put the immune system out of balance.
 *Any food production will also produce equal or superior amounts of biomass in the form of branches, stalks and non edible parts.  Food itself, once digested and excreted, should be reused as it still contains significant amounts of energy and organised materials, as opposed to the original simple molecules it was made of. Humans eat about one tonne of food per year, so the material required for soil will be created at a minimum rate of one to two tonnes per year per colonist. Using Martian regolith, with a typical [[w:Soil|mineral to biomass ratio]] of 9:1,  10 to 20 tonnes of soil per year could be prepared, per colonist <sup>(speculative, need to be checked).</sup>
 ==Composition and structure==
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 *How long does it take to develop soil from pre-soil (under Martian conditions with regolith as the mineral part)? An [[Experimental setup#soil production|experiment should be carried out]].
 [[Category:Biospherics]]

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 *It allows other (i.e. more natural) types for water and air recycling, which may require less effort for maintenance. However, this must be a rather big garden to fulfill such tasks.
 *A sterile habitat may have a devastating effect on the [[immune system]] of the settlers and their [[children]]. Our physiology was forged in a dirty environment, and there are already theories about the growing number of [[allergy|immune mediated diseases]] in the industrial countries, claiming that the urban living conditions with the low numbers of natural germs put the immune system out of balance.
-*Any food production will also produce equal or superior amounts of biomass in the form of branches, stalks and non edible parts.  Food itself, once digested and excreted, should be reused as it still contains significant amounts of energy and organised materials, as opposed to the original simple molecules it was made of. Humans eat about one tonne of food per year, so the material required for soil will be created at a minimum rate of one to two tonnes per year per colonist. Using Martian regolith, with a typical [[w:Soil|mineral to biomass ratio]] of 9:1,  10 to 20 tonnes of soil per year could be prepared, per colonist.
+*Any food production will also produce equal or superior amounts of biomass in the form of branches, stalks and non edible parts.  Food itself, once digested and excreted, should be reused as it still contains significant amounts of energy and organised materials, as opposed to the original simple molecules it was made of. Humans eat about one tonne of food per year, so the material required for soil will be created at a minimum rate of one to two tonnes per year per colonist. Using Martian regolith, with a typical [[w:Soil|mineral to biomass ratio]] of 9:1,  10 to 20 tonnes of soil per year could be prepared, per colonist <sup>(speculative, need to be checked).</sup>
 ==Composition and structure==
-Natural soil contains mineral parts, such as [[sand]] and [[clay]]. Additionally, it contains a variable part of organic matter, such as decomposed pieces of plants and humus. The third part is a complex population of microbes and insects, living in numerous small spaces between the grains and making soil a living system.  Soil is also fairly porous, containing about 50% voids, of which 50% is occupied by water.
+Natural soil contains mineral parts, such as [[sand]] and [[clay]]. Additionally, it contains a variable part of organic matter, such as decomposed pieces of plants and humus. The third part is a complex population of microbes and insects, living in numerous small spaces between the grains and making soil a living system.  Soil is also fairly porous, containing about 50% voids, of which 50% is occupied by water.  Soil compaction is a significant problem, affecting soil fertility.
 ==Biological stability==
 The living part of the soil is in a constant process of renewal and evolution. It needs energy to carry out the metabolism in every single organism. Many microbes and insects are living in symbiosis with each other and with the plants, growing in the soil. The complexity of soils is not fully understood, and all the requirement are not known. Due to its complexity, the complete functionality of soil cannot be preserved for large periods of time.
 ==Artificial soil==
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 In a young Martian colony there is a lack of organic waste, making it hard to make a good pre-soil mixture. None or very little organic matter can be added to the mineral part. Under these conditions the production of soil takes a long period of time. [[Pioneer plants]] can help to accelerate the process. However, over time as as the population grows, both plants and colonists can contribute larger and larger amounts of organic matter to the soil.
-Since soil is complex and not fully understood, entirely artificial soil does not exist.  However, it should be possible to bring from the Earth significative 'seed' soils, that can serve to colonise and enrich artificial soils.
+Since soil is complex and not fully understood, in particular its very complex biome, entirely artificial soil does not exist.  However, it should be possible to bring from the Earth significative 'seed' soils, that can serve to colonise and enrich artificial soils.
 ==Open issues==

← Older revision		Revision as of 20:48, 17 December 2018
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	[[Category:Biospherics]]		[[Category:Biospherics]]
−	~~[[Category:greenhouse]]~~
−	~~[[Category:Agriculture]]~~