Questions tagged [soil]

For questions about the outermost layer of the surface of the Earth. The soil is saturated with organic remains and rock particles.

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7
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1answer
140 views

How deep is soil?

I am curious of the lower boundary of soil. Soil is formed after going through complex processes and it has been through coevolution with living organisms. According to the USDA, for soil ...
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0answers
14 views

How to Distribute Soil moisture output of Thornthwaite and Mather (1954) Soil Water Balance Model into different layers?

in Thornthwaite & Mather (1954) Soil Water Balance Approach The soil moisture output is generated for the whole soil profile, i.e whatever depth we take for the ...
11
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3answers
2k views

Impact of Sugar on the environment

i hope this question fits here. In my local nature reserve there is an "art" project... but the local population has it's concerns. Seeing most things seem to be random trash thrown in (like ...
5
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0answers
55 views

Normalized Difference Vegetation Index sensitivity to soil

A lot of papers mention that Normalized Difference Vegetation Index (NDVI) is sensitive to soil background such as bare soil. My question is what is the exact reason behind the impact of soil on NDVI? ...
4
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0answers
20 views

USDA soil classification vs FAO/UNESCO soil classification

I am making a global social media website for farmers and gardeners which can be used to share information about plant varieties. This sharing is done via so called garden journals. In a garden ...
26
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2answers
8k views

Is there sand in Antarctica?

There's a song "Blizzard's Never Seen the Desert's Sand". Given Antarctica is a desert, someone questioned the title's validity. BUT is there sand in Antarctica? I'd imagine yes as it's a pretty ...
3
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0answers
40 views

Do long-term anaerobic conditions caused by flood-irrigation lead to irreversible soil degradation?

In fields that have been cultivated with rice, frequent flood irrigation can lead to soil degradation. When this type of cultivation has been implemented for several decades, will the soil suffer from ...
2
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0answers
42 views

How fast does sand degrade into silt, and silt into clay?

I am talking to some students about how soil changes, and I've heard from soil samplers that the texture of the soil, i.e. whether it is sand, silt or clay, doesn't change in a human lifetime. It ...
4
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1answer
1k views

Is silicon dioxide (silica) found in all types of soil on the planet?

Known that it is found in sand, silt and clay but is it found in all soils?
0
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1answer
20 views

sub soil data finding

I am going to search and finding some subsoil data, (vanGenuchten Parameters, specific storage, Hydraulic conductivity, porosity, Manning coefficient and humidity of root zone) I have no idea about ...
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2answers
42 views

What method do I use to derive the organic material content (as a percentage) per layer in SoilGrids

I am doing soil related calculations for moisture content and the soil characteristics I need (among others) is the content of the soil as a percentage for: sand clay organic matter I am thinking I ...
0
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1answer
126 views

Difference between soil Water Holding Capacity and soil pore volume?

I have got confused I took 100g soil in a funnel with filter paper. poured 100 ml water and collected the drained water in a calibrated cylinder. Water added in funnel = 100 ml Water collected in ...
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0answers
20 views

Looking for variables to compare against pH of soil

I'm doing a project in junior year chemistry where I get to choose what I investigate as long as it covers course content. I'm interested in exploring how quantitative (ig. incremental) change in an ...
2
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3answers
99 views

Reisdual soil and the atmosphere influence

My text books says that the residual soil shows a similarity in its chemical composition to the original rock beneath it, and that the degree of similarity differs by differing the influence type of ...
6
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3answers
4k views

What is the average color of soil?

Where I live the soil is red. Is there a map or chart where you can see the average color of the dirt according to geographical location? What would the color be if all of the dirt on Earth was ...
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0answers
12 views

SC7 and SC10 Lithology Classifications

I am looking for the full names of the lithology classifications SC7 and SC10. According to the FAO's guidelines for soil description SC3 e.g. refers to silt-, mud-, claystone. What do SC7 and SC10 ...
3
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2answers
318 views

Is it true that aquaponics yield crops with a lower nutritional value than soil-agriculture?

I read this article, in which a person claims that Aquaponics bring crop quality down by having more water than actual nutritional value. I have read many other sources that say the opposite. Can ...
2
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0answers
121 views

What kind of soil is being worked in this video? [closed]

I have recently stumbled across this video on Youtube, where quite a magnificient building is carved into the soil with simple tools like a shovel and hoe. The location is somewhere in South America, ...
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0answers
51 views

Is it normal for clay soil to solidify into a very hard, but not brittle, material in air, and if not what might this soil be?

One part of my garden has a heavy, dark clay soil. It is now waterlogged with a lot of surface water that does not shift at all even after a day of waiting. When pressed into a 4mm thick ribbon, it ...
1
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1answer
131 views

How does fertile soil reach newborn volcanic islands?

When a volcanic island first surfaces, I assume no vegetation can grow, as it probably only consists of volcanic rock. How would a volcanic island like Iceland that is far from any continent grow to ...
5
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2answers
353 views

Peaty soil vs laterite soil

The weather conditions of both peaty soil and laterite soil are the same, i.e. high rainfall & temperature. But the former turns out to become 'excessive organic' whereas the latter becomes '...
5
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2answers
113 views

What is the connection (if any) between jarosite and subsoil biological activity near Spain's Río Tinto?

In the short BBC video Spain's otherworldly red river, Ricardo Amils, a researcher in Spain's Astrobiology Center says the following (amateur transcription): Río Tinto is a peculiar place in our ...
14
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3answers
2k views

How to make Martian soil

My son wants to replicate some experiments and try to grow plants in Martian soil for his A-level science project. I know NASA have managed to produce soil that mimics Martian soil, however I also ...
6
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0answers
30 views

How to make Martian soil [duplicate]

My son wants to replicate some experiments and try to grow plants in Martian soil for his A-level science project. I know NASA have managed to produce soil that mimics Martian soil, however I also ...
0
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2answers
89 views

Leaching Requirement

How can we determine supplemental irrigation needed to reduce soil salinity knowing ETP of a crop and the annual precipitation?
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0answers
31 views

How is soil thickness related to altitude, angle and moisture?

I'm trying to generate a landscape and I want to include soil thickness for realism. Data I have is altitude, angle of a given point and moisture of a given point.
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2answers
87 views

The origin of permafrost

Old permafrost is loaded with frozen vegetation. As it now melts, it is rotting and releasing methane. Doesn't that mean that it froze quickly, centuries ago, and stayed frozen until now? What ...
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0answers
27 views

solubility of rare earth sulphides at different pH?

Will rare earth sulfides in soil be more soluble in aqueous solutions with lower pH? How can I know whether these sulfides will dissolve better at low or high pH or will it not be affected?
5
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3answers
662 views

The fertility of the soil

I came across this question in my book, it says: The fertility of the soil increases when there is a lot of ....... in it. The choices to fill the space were: Nitrogen - nodular bacteria - ...
6
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3answers
418 views

does silt form from sand ; does clay form from silt

I believe that sand, silt, clay are defined by size. But are they also generated by different processes and from different materials? Alternatively do sand particles ultimately weather to make silt, ...
3
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2answers
3k views

Are there any areas on Earth with purplish-colored soil/sand/rock/land?

This sort of comes from my related question, but only sort of. Are there any areas on Earth with purplish-colored soil? The purple tint would come from some mineral, perhaps deposited by rivers or ...
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0answers
33 views

What's a Good Soil Quality Index for Plowed Farm Lands?

I'm currently conducting research using Satellite/Weather/Soil (Mostly Sentinel-2 Satellite Imagery) Data to Model Smallholder Farms and their dynamics before Planting. Key to my progress is to find ...
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3answers
2k views

What is the difference between Saprolite and Regolith?

Saprolite and Regolith both imply loose material, is one a subset of the other how can I differentiate them ?
14
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1answer
10k views

What is hydraulic diffusivity?

I'm having trouble grasping which properties of the soil are described by hydraulic diffusivity (sometimes referred to as soil-moisture diffusivity which is based on the diffusion equation). What ...
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0answers
20 views

Snowmelt erosion in USLE?

Is there any way to compute snow-melt erosion with Universal Soil Loss Equation? How can I change rainfall erosivity factor to snow-melt erosivity?
4
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2answers
206 views

Does the existence of limestone nodules in a clay soil horizon indicate a limestone bedrock?

A profile (clay soil) was excavated to a depth of 100 cm in the north of Tunisia. We have found limestone nodules, colluvium and alluvium. What I would like to know is the nature of the bedrock of ...
4
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2answers
136 views

Why is the bedrock buried so deeply in much of northern Minnesota?

Although parts of northern Minnesota have bedrock exposed at the surface (especially in the Boundary Waters area and along the short of Lake Superior), the more usual situation here is for the bedrock ...
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0answers
79 views

Where are Africa's 600 million hectares of arable land located?

According to Africas Ministers pledge to commercialise regions agricultural sector Speaking during a ministerial roundtable meeting at the AGRF in Kigali, Rwanda, the leaders noted that the ...
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0answers
55 views

soil that is dried (no pore space) weight?

How much would 1 m3 of an ideal mineral SOIL that has been completely dried (all pore space is empty) weigh in Mg on Earth? Answer = ______ Mg
5
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0answers
126 views

How does one find the soil fertility characteristics for islands of Hawaii?

I am trying to find a way to describe the relative soil fertility characteristics for the islands of Hawaii, Maui, and Kauai (youngest to oldest). I want to know about their nitrogen fixation, soil ...
5
votes
3answers
276 views

Making a local geological field trip an interesting and educational event for children?

I have no expertise in geology or earth science, but I would like to do a "field trip" with my home-schooled young children (under age 10) where I could teach them about geology from a hands-on ...
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0answers
46 views

How many kg $ha^-$$^1$ of exchangeable $Mg^2$$^+$ is there in the top 15cm of this field?

Soil testing from a well-drained soil sample in 0-15cm depth of a farmers field provides the following information: • Wet weight of a soil sample from a volume of 100 $cm^3$: 200 g • Moisture ...
5
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1answer
3k views

What is the difference between lunar and earth soil

I know that the moon has lunar regolith and earth has earth soil, but what is the difference between them?
1
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1answer
39 views

Methane Reservoir

Analysis from the Curiosity Rover on Mars has detected tiny amounts of methane in the atmosphere. It is possible the origin of this detected methane is from methanogens deep below the subsurface. My ...
4
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1answer
915 views

Calcareous deposits in arid soil?

I read this line in my textbook: Lower Horizons of arid soil are occupied by calcareous deposits called kankar because of the increasing calcium content downwards. My question is that why only in ...
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0answers
28 views

Which wavelengths is limestone most transparent to?

I think of the non-ionizing range, e.g. Terahertz or Radio. Limestone clearly is transparent to x-ray or gamma but thats not what i am asking for. Natural to low ranges of porosity/water content ...
0
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1answer
78 views

How much excess water prevents planting of a crop

It's a generic question but was wondering if there is a threshold level of soil water beyond which planting a crop (for e.g. soybean) can be hindered because the soil is too wet or flooded. As a ...
3
votes
1answer
1k views

What is the difference between Water Holding Capacity, Field Capacity and TAWC?

I am reading the paper Characterization of yield reduction in Ethiopia using a GIS-based crop water balance model by Gabriel B. Senay and James Verdin, and it says on page 3: Soil water content (SW)...
5
votes
1answer
433 views

European soil texture dataset according to USDA classification

I'm looking for a dataset (in pretty much any format) of soil texture according to USDA classification (by U.S. Department of Agriculture). Is there anything that would cover the entirety of Europe? ...
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0answers
378 views

How eluvial process determines the difference in colour of soil layers [closed]

How eluvial process determines the colour of E horizon lighter compared to O horizon?