Soil - Revision history

Michel Lamontagne at 18:22, 20 October 2023

2023-10-20T18:22:58Z

← Older revision		Revision as of 19:22, 20 October 2023
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	==Why soil?==		==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.
			*It may be a simpler method for recuperating plant biomass and converting CO2 and water inputs into biological systems.
			*Soil is more adequate for parks and other large enclosures, useful for psychological well being and some atmospheric treatment.
			*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>
	*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.		*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>
	*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.		*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==		==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.		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.

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

2022-03-08T16:00:07Z

Regolith use for soil minerals

← Older revision		Revision as of 17:00, 8 March 2022
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	==Regolith use for soil minerals==		==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.

			It is unknown how extensive the perchlorate contamination is. It might be possible to collect uncontaminated regolith from lower layers of the Martian surface.

	==Open issues==		==Open issues==

Michel Lamontagne at 15:53, 8 March 2022

2022-03-08T15:53:06Z

← Older revision		Revision as of 16:53, 8 March 2022
Line 32:		Line 32:
	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==

Kee.nethery: /* See also */

2021-10-18T21:59:46Z

Kee.nethery: add See also.

2021-10-18T21:59:10Z

add See also.

← Older revision		Revision as of 22:59, 18 October 2021
Line 38:		Line 38:
	*What species (microbes and insects) are necessary for a functioning symbiosis with plants?		*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]].		*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]].

			== See also ==
			{{div col\|colwidth=30em}}
			* [[Surface composition]]
			{{Div col end}}

	== References ==		== References ==
	[[Category:Biospherics]]		[[Category:Biospherics]]
	<references />		<references />

Michel Lamontagne: /* Open issues */

2019-06-09T17:11:51Z

Open issues

← Older revision		Revision as of 18:11, 9 June 2019
Line 11:		Line 11:
	*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.		*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>		*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>
			*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.

	==Composition and structure==		==Composition and structure==
Line 38:		Line 39:
	*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]].		*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]]		[[Category:Biospherics]]
			<references />

Michel Lamontagne: /* Biological stability */

2019-06-09T17:08:05Z

Biological stability

← Older revision		Revision as of 18:08, 9 June 2019
Line 10:		Line 10:
	*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.		*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.		*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==		==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==		==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.		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.

			From Wikipedia: <nowiki>''</nowiki>Soil is the most abundant ecosystem on Earth, but the vast majority of organisms in soil are microbes, a great many of which have not been described. There may be a population limit of around one billion cells per gram of soil, but estimates of the number of species vary widely from 50,000 per gram to over a million per gram of soil. The total number of organisms and species can vary widely according to soil type, location, and depth<nowiki>''</nowiki>.

			Soil contains approximately 2,5 tonnes per hectare of bacteria and other living organisms<ref>https://www.nrcs.usda.gov/wps/portal/nrcs/detailfull/soils/health/biology/?cid=nrcs142p2_053862</ref>.

	==Artificial soil==		==Artificial soil==
Line 25:		Line 29:
	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.		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==		==Open issues==

Michel Lamontagne: /* Why soil? */

2019-06-09T16:29:07Z

Why soil?

← Older revision		Revision as of 17:29, 9 June 2019
Line 5:		Line 5:
	==Why soil?==		==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 a few advantages in having a small garden with soil, too.
	* 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.
	* 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.		*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.
	* 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.		*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.
	* 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.		*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.

	==Composition and structure==		==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.		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.

	==Biological stability==		==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. ~~Yet, the~~ complexity is not fully understood. ~~Soil can~~, ~~therefore, not~~ be preserved for large periods of time.		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==		==Artificial soil==
Line 21:		Line 23:
	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.		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.

	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.		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.

	==Open issues==		==Open issues==

	*How long can soil be held alive in a dark container (e.g. for transportation)?		*How long can soil be held alive in a dark container (e.g. for transportation)?
	*What temperature range is required to keep soil alive?		*What temperature range is required to keep soil alive?

Jburk at 20:48, 17 December 2018

2018-12-17T20:48:03Z

← Older revision		Revision as of 21:48, 17 December 2018
Line 30:		Line 30:

	[[Category:Biospherics]]		[[Category:Biospherics]]
	~~[[Category:greenhouse]]~~
	~~[[Category:Agriculture]]~~

Rfc: /* Artificial soil */ link fixed

2013-10-02T07:17:53Z

Artificial soil: link fixed

← Older revision		Revision as of 08:17, 2 October 2013
Line 17:		Line 17:

	==Artificial soil==		==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 [[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 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.

	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.		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.

← Older revision		Revision as of 22:59, 18 October 2021
Line 40:		Line 40:

	== See also ==		== See also ==
	~~{{div col\|colwidth=30em}}~~
	* [[Surface composition]]		* [[Surface composition]]
	~~{{Div col end}}~~

	== References ==		== References ==
	[[Category:Biospherics]]		[[Category:Biospherics]]
	<references />		<references />