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Questions tagged [soil]

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60 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
15 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?
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3answers
109 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, ...
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25 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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0answers
14 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?
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1answer
42 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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2answers
110 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
56 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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1answer
307 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?
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53 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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3answers
226 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
41 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 ...
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2answers
72 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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1answer
38 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 ...
5
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1answer
115 views

Peaty soil vs laterite soil

The weather conditions of both peaty soil and laterite soil is same ie high rainfall & temperature. But the former turns out to become 'excessive organic' whereas the latter becomes 'excessive ...
4
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1answer
474 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 ...
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2answers
3k views

What is the average color of dirt?

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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1answer
476 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)...
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1answer
69 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 ...
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2answers
7k 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 ...
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0answers
104 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 ...
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336 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?
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90 views

Formation of minerals from decomposition of soil

I was wondering if aerobic decomposition of organic rich soils, also rich in calcium and sulfur, can result in the precipitation of gypsum. My thinking is the decomposition would release the ...
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0answers
28 views

Designing FIR or other filters for soil water content

I have 250 or so soil sensors that I need to QC. They monitor various parameters such as soil temp, soil water content, soil co2, and soil heat flux. It isn't unusual for a sensor to behave poorly due ...
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2answers
113 views

Soil Science and the carbon cycle - is carbon released from soil into the atmosphere?

Is carbon lost from topsoil when it's degraded/removed? What is the scientific process?
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3answers
1k 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 ?
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1answer
75 views

Does the diameter of the earth decrease because of soil subsiding due to irrigation and rainfall over the years?

I am taking a course on coursera where the instructor talks of a soil subsidence concrete post that was put there in Everglades southern Florida in 1920s. He goes on to describe the level of earth ...
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0answers
50 views

Soil metals acids and bases

I have read in environmental science textbooks that aluminum can acidify soil, whereas metals such as sodium, calcium, magnesium, and potassium can alkalinize soils. I understand that Al3+ can ...
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2answers
479 views

Why is northern Australia unsuitable for agriculture?

Northern Australia receives substantial rainfall, but its population is minimal. For instance the Kimberley region in the state of Western Australia gets more than 20 in. of rainfall per year, but ...
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2answers
84 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 ...
5
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3answers
565 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 - ...
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3answers
6k views

Do volcanos really create fertile soil?

I'm developing an ecology for a portion of my world that's geologically active and I remembered hearing that volcanic ash in soil makes it more fertile to agriculture. After extensive googling I've ...
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0answers
244 views

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics?

What is the difference between the Hydraulic diffusion equation and the Richards equation in groundwater dynamics? I want also to understand the difference between the different storage coefficients (...
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0answers
30 views

Can caliches form in arctic soils?

Caliches are signature features of many arid soils. In addition to the typical places of formation in deserts, they also occur in parts of the Tibetan plateau. Can they also form in polar climates? If ...
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1answer
185 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 ...
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4answers
560 views

How can poor tropical soils be enriched by biological means?

I have been reading a lot recently about agriculture in Africa, and one of the big impediments in a lot of places is the poor quality of the soil. Primarily this refers to a lack of usable molecular ...
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2answers
2k 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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1answer
2k 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?
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2answers
177 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 ...
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2answers
480 views

Is the colour of soil determined by the 'proteins' present in soil?

According to wikipedia, the colour of soli is determined by proteins present in the soil! Soil color is influenced by the amount of proteins present in the soil. Yellow or red soil indicates the ...
8
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1answer
141 views

What is the residue after plant matter is completely decomposed?

What typical fraction of decomposing plant matter, left on the surface rather than buried, is not released in gaseous form? My simple world view is that the plant structure has all come from the air, ...
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1answer
1k views

Factors Affecting Soil Profile

Soil forming factors can include climate, parent material, vegetation, animal activity, fire and influence by humans. I have investigated a podzol soil profile with horizons LFH, AH, AE, BF and ...
5
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1answer
352 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
12 views

Searching for database for Colorado soils that goes back to 1990's

Are there any database for the soils database out there beside NRCS ? I am fully aware that NRCS has their database on their website but I was wondering if there is one that can't i find them ? I am ...
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0answers
32 views

Is there a way to calculate difference initial water content, from curve number method?

I want to calculate difference between initial water content of a soil given that its saturation water content can be found from its type. Is there a way to find initial water content of that soil ...
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2answers
103 views

What would be the correct terminology for soft cover on crust?

Earths' crust is usually not exposed. Above-water portion is covered with soil, and Underwater portions are covered with various deposits or sediments. Oceans contain Pelagic sediments.(I don't know ...
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0answers
39 views

What field data do I need for the Green-Ampt infiltration Model?

I want to estimate infiltration in a soil. What kind of parameters should I be measuring in the field?
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4answers
305 views

How to identify a landslide area early?

We know that this natural disaster can cause a big damage. I have heard that we can identify such areas by some geographical signs, such as curved trees. Do we have any stronger detectable signs which ...
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2answers
350 views

How to find molarity of a fertilizer?

I want to add nitrogen to my soil samples in a lab as fertilizer (ammonium nitrate). I need to add it equivalent of 50 kgN/ha. I have a clump of soil, that weighs 20g. What is the best way to convert ...