Questions tagged [soil-science]

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

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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,...
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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.
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4 votes
2 answers
80 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 ...
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"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; ...
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4 votes
1 answer
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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, ...
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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 ...
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5 votes
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52 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 ...
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4 votes
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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 ...
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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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1 vote
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70 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 ...
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0 votes
1 answer
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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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2 votes
3 answers
219 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
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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 ...
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1 answer
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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 ...
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2 votes
1 answer
70 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 ...
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1 vote
1 answer
127 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 ...
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1 answer
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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 ...
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5 votes
2 answers
117 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 ...
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4 votes
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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 ...
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6 votes
0 answers
31 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 ...
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14 votes
3 answers
3k 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 ...
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15 votes
5 answers
5k 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, ...
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0 votes
1 answer
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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),...
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-1 votes
2 answers
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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??
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4 votes
2 answers
58 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 ...
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1 vote
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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 ...
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0 votes
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34 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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1 vote
0 answers
13 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 ...
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4 votes
1 answer
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?
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1 vote
0 answers
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
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3 votes
0 answers
63 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 ...
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1 vote
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49 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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2 answers
94 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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1 vote
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394 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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3 votes
0 answers
36 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 ...
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4 votes
2 answers
2k 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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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 ...
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11 votes
4 answers
628 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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