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Questions tagged [soil-science]

Questions regarding the state and functioning of soil, its interaction with the biota, hydrosphere and atmosphere

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Relation between water holding capacity and moisture content

I would like to know if there is a link between WHC and humidity. I have a compost with a maximum retention capacity of 500 mL/L and a moisture content of 77%. I have about 290g of compost in each ...
FatGuy's user avatar
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2 votes
0 answers
22 views

Meaningful Tests to challenge a Soil Probe

I'm an engineer doing some R&D designing a new product to measure some interesting soil parameters, and integrating a multi-pronged sensor probe to take the measurements. I'm considering making ...
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1 answer
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Does anyone know what the mineral of the year 2023 is?

I am collecting every mineral of the year since 2012, and I have not found anything on last year's mineral. Thank you.
Lalith_Aditya's user avatar
0 votes
2 answers
73 views

Question regarding underground man-made facilities

Why is it that underground facilities (or underground military bases) are almost always built into hollowed out mountains? Examples of (publicly known ones anyway) are Cheyenne Mountain Complex and ...
dazzleworth's user avatar
1 vote
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191 views

Is it possible/effective to synthetically produce chernozem soil?

Chernozem soils, called mollisols in the Americas, are black-colored soils containing a high percentage of humus (4% to 16%) and high percentages of phosphorus and ammonia compounds. Many earthworms ...
CriglCragl's user avatar
2 votes
0 answers
67 views

How to accurately estimate air-entry value (AEV) suction for soils?

In the literature, there are graphical (approximate) ways to estimate AEV from the soil water retention curve. I wonder, how can one more accurately estimate AEV according to its definition: the ...
Alireza Amani's user avatar
3 votes
0 answers
25 views

Can single point value for potential water-logging be calculated using soil particle size, organic matter and bulk density

I am studying the recent paludification (e.g. mineral soil forests turning to peatlands) in a boreal regime. I have collected peat samples from the peat/mineral subsoil contact that have been 14C ...
Teemu Juselius's user avatar
4 votes
0 answers
32 views

Reason for finding low boron levels in clayey soil with high organic matter?

I've read from various University Extension sites (e.g., here and here) that boron levels would be deficient in sandy soils with low organic matter. This would suggest that boron levels would be ...
theforestecologist's user avatar
3 votes
0 answers
175 views

Causes of high calcium levels in sandy alluvial soils

When soil calcium is high: High levels of soil calcium may be expected when there is substantial calcium carbonate bedrock from which the soil has weathered. Calcium levels can be high in agricultural ...
theforestecologist's user avatar
2 votes
1 answer
230 views

Can base saturation percentage be greater than 100%?

I have been doing some quality analysis on soil analytical data that I've gathered from some environmental impact assessments. Many of the values for base saturation percentage are well over 100% (...
Mike's user avatar
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1 answer
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How does humanure make soil "fluffier"?

This BBC article says biosolids make soil "fluffier", among other benefits. How? Adding humanure also changes soil structure, making it more resilient, preventing erosion and balancing out ...
Sergey Zolotarev's user avatar
3 votes
1 answer
108 views

How to define the lower boundary conditions: seepage face and unit gradient in terms of soil volumetric water content?

context: the models that simulate the flow of water in the soil (e.g. land-surface models) In these models, in order to simulate percolation (/drainage) from the bottom of the defined soil column, we ...
Alireza Amani's user avatar
1 vote
0 answers
17 views

What chemical or physical parameters altered during the usage of buffered versus unbuffered extractant for leachability of a soil or sediment?

Toxicity characteristic leaching procedure (TCLP) is an extraction method to simulate a soil or sediment leaching. The method employed two extraction fluids - one is a buffered solution of acetic acid ...
làntèrn's user avatar
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2 votes
1 answer
56 views

Signs of hydrocarbon contamination in soil?

So, let's say, ~completely theoretically~ you knew, beyond a reasonable doubt, a large oil company was doing something nefarious near you. They own a very strange property through a shell company. Now,...
Anna Wood's user avatar
1 vote
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32 views

soil water retention and soil water content

Can someone clarify me about this doubt? Is the available soil water content (field capacity minus wilting point) the same as the soil water moisture or soil water content? Thank you.
mglrdrgs's user avatar
4 votes
2 answers
472 views

How does manure & other organic matter improve soil structure?

How does manure & other organic matter improve soil structure? Based on my understanding, soil structure refers to the arrangement of the aggregates within the soil; a good soil structure prevents ...
Shane's user avatar
  • 321
1 vote
1 answer
49 views

"Down wash" as a source for mineral particles in the soil

In a previous IGCSE examination paper$^1$, the following question was asked and answer provided: State one source of mineral particles in soil. Marking Scheme: Accept any one of: rock; down wash; ...
Shane's user avatar
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4 votes
1 answer
236 views

Generalized Soil Unit Information on Soil Characteristics of FAO/UNESCO Soil Map

I have some doubts regarding the FAO/UNESCO Soil Map of the World. I have downloaded the ESRI shapefile format of Digital Soil Map of the World (3rd download link on this page). Among other files, ...
Badal's user avatar
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1 vote
0 answers
34 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 ...
Abhilash Singh Chauhan's user avatar
5 votes
0 answers
251 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 ...
Maurice's user avatar
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4 votes
0 answers
59 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 ...
Tom's user avatar
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7 votes
1 answer
521 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 ...
Padmanabha's user avatar
1 vote
0 answers
129 views

Why is the concentration of nitrogen gas almost equal in soil air and the atmosphere?

From the composition of soil air, we know that oxygen is much less than that of atmospheric air. On the other hand, carbon dioxide is higher in soil. However, nitrogen gas is very much similar in both ...
Padmanabha's user avatar
1 vote
1 answer
25 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 ...
dalfardi.s's user avatar
2 votes
3 answers
516 views

Is a hotter climate making trees grow faster and have lighter wood?

I started thinking about this after seeing several articles about falling trees, in particular a few articles about very large trees falling in Los Angeles and New York City. Plus, just thinking about ...
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1 vote
0 answers
27 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 ...
Joshua's user avatar
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1 vote
1 answer
75 views

Can we define "drainage density" for a soil column (point-scale)?

From what I read all over the web and articles, drainage density is a parameter that is defined for a catchment. I want to use a hydrological model to simulate the percolation from the bottom of a ...
Alireza Amani's user avatar
2 votes
1 answer
118 views

How to obtain the saturation point of a soil layer from the volumetric soil water content data?

Would you please let me know if the following is accurate as an answer to the question: Suppose we have sensors which measure the volumetric soil water content of a soil layer for a long period (more ...
Alireza Amani's user avatar
1 vote
1 answer
324 views

What is the "pressure gradient" within the richards equation

I'm trying to understand the Richards equation that can be used to compute the flow of water in soil. In a textbook I found the following: Unfortunately, the textbook doesn't really explain what the ...
DGIS's user avatar
  • 341
1 vote
1 answer
71 views

What will be the depth that water can sink to the ground? [duplicate]

Currently there is a pond in one acre of land which is of 4 feet depth. If the pond is filled with water it is expected that some percent of the water will be absorbed by the ground under the pond. To ...
RAGHU VEER's user avatar
5 votes
2 answers
128 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 ...
uhoh's user avatar
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4 votes
0 answers
45 views

Which unsupervised classification method for non linear multivariate time series earth observation data in python

I have collect several data sets for a small region in Germany called Hessisches Ried (about 90 km²) from different sources for a time period from 2015 to 2019. Daily rainfall amount & daily ...
till Kadabra's user avatar
6 votes
0 answers
32 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 ...
Magic Bullet Dave's user avatar
14 votes
3 answers
4k 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 ...
Magic Bullet Dave's user avatar
14 votes
5 answers
6k views

How did forests end up covering pyramids?

I went to Mexico and the pyramids are covered by vegetation. It's only after archeologists clean them that you can actually see the pyramids. Before that they looked like a natural hill, with soil, ...
Thomas's user avatar
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1 vote
1 answer
58 views

The state of Nitrogen, Phosphorous and Potassium during Anaerobic Digession

I am planning to go for organic farming and I would like to utilize available weeds as fertilizers with either anaerobic or aerobic digestion. I understand that during the aerobic process (composting),...
Rajesh's user avatar
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0 votes
2 answers
13k views

Can Some not all mountains actually be Giant petrified Tree Stumps? [closed]

Is it possible That The process that had occurred with the flood have actually petrified ginormous tree stumps during the flood??
Yonny5's user avatar
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5 votes
2 answers
77 views

Effect of organic matter on salinity

Organic manure is used in agriculture around the globe. I am interested in how does organic matter affect the salinity of soil? Does it increases, increases or remains unaffected? and is there a study ...
pkj's user avatar
  • 151
1 vote
0 answers
27 views

Get NPK values of soil without spectroscopy

I stumbled upon this new device called Teralytic. Which can measure salination, NPK values and all sorts of things. Unfortunately it's sold out and I think when it'll be available again rather ...
Cowboy_Patrick's user avatar
1 vote
0 answers
37 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 ...
shakib tsouli's user avatar
1 vote
0 answers
15 views

Why do allophane soils behave as gels?

It is notoriously difficult to determine the texture of soil containing allophane and immogolite. According to the literature this is because the clay fraction "behaves as a gel", i.e. it's not ...
Lasse Westerberg's user avatar
4 votes
1 answer
2k 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?
zan867's user avatar
  • 53
1 vote
0 answers
58 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
zan867's user avatar
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3 votes
0 answers
88 views

How can shake amplitude influence the damping ratio and resonant frequency of a soil base structure?

I have performed an experiment using a shaking table to simulate the response of a soil base structure to an earthquake. A multi-floor structure was placed on a sand (90% relative density) bed and the ...
Max's user avatar
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1 vote
0 answers
51 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 ...
DORCT's user avatar
  • 11
0 votes
2 answers
100 views

Leaching Requirement

How can we determine supplemental irrigation needed to reduce soil salinity knowing ETP of a crop and the annual precipitation?
zrlos's user avatar
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1 vote
0 answers
422 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?
Sudheer Muthusamy's user avatar
3 votes
0 answers
39 views

Passive capillary wick samplers

I am interested in sampling soil solution at different depths on Andean soils. I have found that Passive-capillary samplers have been extensively used to sample soil water, however I was not able to ...
Marlon Calispa's user avatar
4 votes
2 answers
4k 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?
Ronald Jees's user avatar
3 votes
0 answers
34 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 ...
Knob Scratcher's user avatar