Science topic
Soil - Science topic
The unconsolidated mineral or organic matter on the surface of the earth that serves as a natural medium for the growth of land plants.
Questions related to Soil
I know P fixation in soils depend on many factors. For know there are general data sets for the % P fixation in relation to pH. I was wondering if there is something like this bu in retation to soil type.
Is it possible to use sodium polyphosphate instead of sodium hexametaphosphate to measure soil texture? How and in what concentration?
Soil has generally been regarded as the largest carbon pool in the terrestrial ecosystem, being approximately 2300 Gt C as estimated in previous literature. However, lithosphere contains more C as inorganic materials such as carbonate rocks, maybe ~ 20000 Gt C in rocks. Do we need to clarify that soil is the largest organic carbon pool (instead of carbon pool) in the terrestrial ecosystem, since carbon consists of organic and inorganic C containing materials and the size of soil total C storage is far less than that of rock C?
want to perform modelling of under ground circular tunnel in silty sand medium. while defining the geostatic stress, and geostatic step due to the curved boundary in the soil medium, at the last increment of the first step ( geostatic step) the model get an error of" too many increments need to complete the step". i think the issue is due to the curved boundary within the soil medium. how can i complete the analysis without error.
In research where the objective is to study the impact of microplastics on soil properties, is it necessary to evaluate the original microplastic concentration of the test soils?
If the soils are polluted with microplastics, are they unsuitable for exposure treatments where additional microplastics (of known characteristics and concentration) will be added to the soil?
I assessed 6 fractions of total inorganic P namely, Saloid-P (1 N NH4Cl), Al-P (0.5 N NH4F), Fe-P (0.1 M NaOH), Occluded-P (0.1 M NaOH), Ca-P (0.5 N H2SO4) and Residual P (HF digestion) following the selective sequential extraction procedure of Peterson and Corey (1966).
The Residual-P share in my paddy soil (clayey Inceptisol, circumneutral pH, high in Fe and Al) is quite large. Where do Residual-P and other fractions of P necessarily come from? What exactly do they consist of?
What specific natural plant nutrient sources or plant growth-promoting sources, such as BIOSTIMULANTS, BIOFERTILIZERS, etc., would you use for starting cultivating tropical crops like corn, sorghum, millet, peanuts, tomatoes, and onions in a middle scale production in a tropical country as Simbabwe, where chemical fertilizers are economically not afordable or either unavailable, but where some animal dung is accessible?
How economically successful is it which commercially available mycorrhiza to use or other microorganisms of the soil microbiome with similar benefits such as PGPR (plant growth-promoting rhizobacteria), PGPF (plant growth promoting fungi), PGPM (plant-growth-promoting microorganisms), as well to use seaweed, algae stimulants or verimcompost?
Using which MYCORRHIZA for low cost tropical agriculture? Or other BIOSTIMULANTS, BIOFERTILIZERS?
What specific natural plant nutrient sources or plant growth-promoting sources, such as BIOSTIMULANTS, BIOFERTILIZERS, etc., would you use for starting cultivating tropical crops like corn, sorghum, millet, peanuts, tomatoes, and onions in a middle scale production in a tropical country as Simbabwe, where chemical fertilizers are economically not afordable or either unavailable, but where some animal dung is accessible?
How economically successful is it which commercially available mycorrhiza to use or other microorganisms of the soil microbiome with similar benefits such as PGPR (plant growth-promoting rhizobacteria), PGPF (plant growth promoting fungi), PGPM (plant-growth-promoting microorganisms), as well to use seaweed, algae stimulants or verimcompost?
Hello, everyone!recently we are collecting ground hyperspectral measurement data ( such as soil, vegetation, snow ) with a wavelength range of 400-2500 nm. We have collected some spectral data, but it is still not enough for our research. Therefore, we would like to ask you where there is a free open spectral library ? Or we can cooperate together. Thank you very much.
I need help modelling horizontal BNWF with axial, transverse, and vertical (bearing & uplift) springs and spring damper at the ends to simulate connectivity.
I want to know how I can model these on to the beam and assuming the pipeline segment is 1 kilometer in length, at what intervals should the soil springs be applied? Can we assign line springs in OpenSees?
Thank you
P.S I would like to validate my results through this paper "Seismic risk assessment of buried steel gas pipelines under seismic wave propagation based on fragility analysis - Vahid Jahangiri, Hamzeh Shakib" - DOI 10.1007/s10518-017-0260-1
Prof. Van der Wolf with colleagues (2005)* wrote that for "... Clavibacter michiganensis no data on transmission via nematodes are available".
Dr. Osdaghi (2022)** in the most recent review of C. sepedonicus does not mention nematodes as vector.
But, there are some indirect references on nematode importance for Cms, and role of Ditylenchus dipsaci for C. insidiosum is well-known (Hawn, E. J. "Transmission of bacterial wilt of alfalfa by Ditylenchus dipsaci (Kühn)." Nematologica 9.1 (1963): 65-68.)
So, can nematodes be a vector for Clavibacter sepedonicus and C. michiganensis?
*Van der Wolf, J. M., J. G. Elphinstone, D. E. Stead, M. Metzler, P. Müller, A. Hukkanen, and R. Karjalainen. Epidemiology of Clavibacter michiganensis subsp. sepedonicus in relation to control of bacterial ring rot. No. 95. PRI Bioscience, 2005.
**Osdaghi, Ebrahim, et al. "Bacterial ring rot of potato caused by Clavibacter sepedonicus: A successful example of defeating the enemy under international regulations." Molecular Plant Pathology 23.7 (2022): 911-932.
Do you know if there is any IMPACTED journal WITHOUT APC where environmental and ecological data can be published?
In particular, I am looking for something about 1) soil and vegetation data and 2) communities data.
I have modeled a two-dimensional plane strain embankment in Abaqus. I did not apply any forces, boundary conditions, or displacement to the infinite element, and I defined it as CINPE4. I defined two steps for the model: the first step is static to apply gravity load, and the second step is dynamic implicit. In the second step, I applied the time history of the Loma Prieta earthquake horizontally on the base of the model. Ultimately, I observe a concentration of shear strain at the boundary between the infinite and finite elements, as shown in the image below.
In addition, I have attached my model's .inp file to this question for reference.
We developed a sensoring system for monitoring agricultural soil. But struggle with finding the right formula to convert mg/kg to kg/hectare. The formula we got right now is shown below and we use nitrogen for example.
(mg N/kg x soil density in g/cm3 x depth of measuring in cm x humidity/moisture level of soil in %)10
For example the total nitrogen in mg/kg= 1230mg/kg
Soil density= 1.474 g/cm3
Measuring depth= 25 cm
Humidity/ moisture level=20%
/10 to convert mg/kg to kg/ha
All the values given above are factual only the moisture level is estimated because that was not given in a report given to us.
(1230x1.474x25x0.20)/10= 906.51
which is false because the actual total Nitrogen in kg/ha is 4530
the formula would be correct if it would end with /2 instead of /10 so there is a mistake with a factor of 5 but we can not identify it. It might be the moisture level being incorrect or something else.
If anyone has the solution or an other formula I would love to hear from you.
this is my mail if you want to contact me directly [email protected]
How to incorporate the impact of biogas digestate application on cultivated land and crop growth into the life cycle assessment (LCA) of biogas project?
For example, biogas gigestate application may improve the carbon sequestration capacity of farmland soil. Can this index be calculated into the emission reduction capacity of biogas projects? And how?
Thank you !
Which one is better and more useful?
I am looking for the papers which analyzed the drought tolerant activity of rice varieties by using PEG6000 in hydroponics culture and soils with water (field trial) both. I found only one paper. Could you please help me to find more papers which use both methods?
Thank you.
How do insects contribute to soil health and nutrient cycling?
What are the best practices for soil management to improve soil health and fertility?
This is one of our works based on analysing the viability of ammonia recovery and removal from manures extracted from dairy farm. These kinds of approaches could be sustainable solutions for mitigating air pollution as well as could be utilised into sustainable energy productions.
What are some of the alternative measures could be used to recover ammonia from the animal manures those are practiced around world in domestic and industrial phases?
Hi! I am extracting DNA from sand beach samples using PowerSoil Pro. I tested several versions/modifications of the protocol, and although the concentration has increased, it is still too low for the purposes I need. So which protocols do you usually use for this type of sample? Any tips?
It is said that lava contains many valuable plant nutrients and plants grow particularly well on solidified lava. Lava is also a particularly fertile soil for plant growth.
The above of our two research articles are two of our important efforts on how to conserve the soil and use it for the enhancement of reforestation to mitigate climate change impacts such as Urban Heat Island, loss of endemic species, scarcity of water and greenhouse gas emissions which are the leading concerns in urban built environment. Our articles have addressed a way to achieve the sustainable development goals such as SDG6, SDG12 and SDG 13.
Soil resources are most critical prerequisites those need to be conserved, utilized and given back to the earth to enhance the sustainable existence of living organisms. Current technological trends are mostly focusing on mining the soil resources and fulfilling the human needs using anthropogenic activities. This trend needs to revisit, addressed the research gaps and more interests need to be shown by researchers and stakeholders to enhance the optimum usage of soil resources with minimal harmful effects to nature.
I request the researchers to provide your opinions in this regard. Thank you.
What's a good device that can give an accurate and quick read of soil moisture, at the soil surface? Preferably something relatively immediate, to use in fieldwork, not an iButton or similar.
Or are gravimetric measurements of soil samples considered more reliable?
In an experiment concerning fine root decomposition by litter bag method, I collected the residual of fine roots in the bags for a year, and determined the C, N, P, Al, Mg, Ca, content of them in lab, also soil temperature and moisture were recorded.
I agree the decomposition rate will affected by characteristic of fine roots, and it seems that discussion on how the environmental factor contributes to the decomposition is rare, does anyone know more about this? Thanks for your ideas.
I'm doing an elemental analysis of soils using an XRF Analyzer, the results obtained are in ppm. My question is, can I directly convert values from ppm to mg/Kg of soil?
Can a Zetasizer measure soil particle size? If yes, could the results (particle size) be exploited to determine the soil granulometry?
Hello fellow Researchers,
perhaps some of you could help me a bit with figuring out what stays behind the mysterious phenomenon of NH3 volatilization from the sandy soil treated with glukose.
Brief explanation below:
As a part of the project that I am currently researching, I am running an incubation (mesocosm) experiment to identify a connection between the different properties of manure/slurries and the GHG and ammonia emissions caused by their soil application. As a "referencing" controls, aside from the blanks, I used UREA and CAN as a mineral nitrogen source, and glukoze as an only carbon-input treatment. The idea for the glukoze was to see the effect of easily degradable/bioavailable carbon source on N2O soil emissions. I was curious to see if N2O emissions caused by manure application are affected mostly by N-NH4+ and N-organict input or also because of significant carbon input. Me and my team hoped that carbon only (in this case glukose) treatment could, not precisely but still, help to identify the above.
Besides registering small fluxes of N2O caused by glukoze application (that was an expected outcome), we noticed a huge effect on NH3 volatilization that not me, nor my colleagues, can explain.
I did some additional tests in the form of regular pot experiments but these ammonia phenomena are repeatitibly occuring.
The highest fluxes were noticed around 5-8 days after application. I did the measurements using a static closed chamber technique (with linear increase based closure time) with a photoacustic analizer Innova 1512.
Hope to get some nice and inspirational potential answers!
Cheers
Sebastian
It is known that soil texture does not change easily, but the effect of soil tillage, soil fragmentation and the passage of agricultural machinery over it, will it affect the soil texture over hundreds of years?
I’m looking for research testing the accuracy of GPS at various buried depths. I’m wondering if GPS, RTK and LoRa could be used to mark the location of underground utilities.
I would like to know the opinion of soil researchers about improvement of saline soils by application of biochar. Is biochar really helpful to decrease salt in the soil? how is it going on with osmotic pressure?
I would like to know the opinion of soil researchers about introducing the best organic methods for optimization of organic matter content in saline soils.
Roots have the ability to manage the soil microbial community by releasing a wide range of secretions known as root exudates. So I want to extract these exudates from wheat using root exudates' collection that will be pursued using a hybrid approach to counter the disadvantages of using ‘only soil’ and ‘only hydroponic’ approach. But I have not been able to find a suitable procedure that is cost-effective and easy to perform as I have to further send these extracted exudates for gcms (Gas chromatography mass spectrometry). Main motive is to find suitable method so that we can easily extract the exudates from treated water that will be used in hybrid method so that can be easily examined through gcms.
I read something about LIMAN irrigation in the Kazakh steppe.
How is LIMAN irrigation: and how is it carried out and does it work?
Thanks, Johann HUMER, Austria
I would like to perform detection of antibiotics but all the papers I checked irrespective of the method, SPE was a necessary step. Are there any cheaper alternative for SPE.
I found these seeds (photo attached) in the gizzards of Green-winged Teal (n=51), and I was hoping that someone on here could recognize them before I start diving into the seed manuals to identify them. I am not good with wetland seed identification but I'm pretty sure the second from the left in the middle row is Polygonum lapathifolium. If you have any book recommendations too please let me know, these were found in coastal North Carolina. Thanks!
Lee's disc apparatus is designed to finsd thermal conductivity of bad conductors. But I am having a doubt that, since soil having the following properties:
1. consists of irregular shaped aggregates
2. Non uniform distribution of particles
3. Presence of voids
Can we use Lee's disc method find thermal conductivity of soil???
I modeled vertical stiffness of soil by UEL subroutine of Abaqus. The pipe laid on the seabed and moves up and down due to this stiffness.
For the current step, I can determine the vertical displacements of the pipe at the end of this step.
Force=Ky*u(2)
Now, I’m going to define new stiffness. Actually, when I define a new stiffness in the next step, all calculated displacements from the previous step will be reset and will no longer be continued for the next step. (Actually, in the new defined step, pipe reset its previous displacements and start to move from zero).
Do you have any suggestions to keep remain calculated displacements from the previous step, and continue them in the next step?
Any comments are highly appreciated
Hossein
I modeled a lumped mass structure based on a soft clay.I want to find natural frequency of that structure. I tried by using frequency step under linear perturbation and i got frequency corresponding different mode no. in visualization module . But i think ,that frequency is considering whole module(structure+soil). How can i find the frequency of structure only.
In the method I know the water colected at the end of the plots must be dried and then wheighted for us to obtain the mass.
Is there a route in wich we don't need to dry the samples?
I am aware of LASER, topic/surface and other approaches applied in erosion plot scales, but I'm interested in keep using the samples of water + soil.
How, by measuring the electrical conductivity of the Drainage from the hydroponic growth medium such as cocopeat or perlite, find out how much nutrient solution is needed for irrigation to keep the moisture in the growth medium constant?
Identifying soil parameters and their analysis.
Nowadays microplastic pollution increases in soil, is there any chance microplastic is present in vermicompost obtained from decomposition/vermicomposting of organic waste?
In civil engineering applications, a lot of research has been conducted using shredded rubber and soil (sand/clay) mixtures, but from the images shown, it is clear that even in the laboratory, the homogeneous mix can not be achieved. However, researchers have ignored it and reported the data obtained through laboratory experiments.
Are there some efficient methodologies to make a homogeneous mixture using two materials that significantly differ in specific gravity (sand has around 2.5 times higher specific gravity than shredded rubber)?
We have huge quantity of Calcium Hydroxide dried sludge as a waste material, and planning to utilize it as a soil conditioner, please suggest the utilization possibility of that material. Major issue with the sample is pH >12.5 and EC is >10.
I like to see comments of dear researchers concerning the future debating topics about studying the biodegradation of microplastics by soil organisms.
I simulated a pile embedded in sand soil. The pile was subjected to lateral and vertical forces. The model was aborted. I have printed the "Job Diagnostic" to present the causes of the aborted model. The problem occurred because of the nodes at the contact surfaces between the soil and pile. Some nodes were overclosure, and others separated, as presented in the figure below. How can I solve this problem?
If soil is being irrigated with saline water (Chloride dominated), how does the presence of chloride ions reduce availability of soil P to the plants ?
We can measure exchangeable K, Ca using flame photometer. Is it possible to analyse these ion using spectral analysis
Soil regeneration is vital for allowing soil to perform its functions, and that comprise creating new soil or rejuvenating the soil health by minimizing the loss of topsoil, retaining carbon, boosting biodiversity, and maintaining proper water and nutrient cycling.
What are some of the non-chemical routes for carrying out successful soil regeneration?
Hello,
I have extracted DNA from my soil samples (dry and sandy) through two different extraction kit (both from Qiagen)
1) by DNeasy PowerSoil Kit
2) by Total RNA Isolation kit (DNA eluting after RNA isolation through eluting buffer).
I got huge difference in extracted DNA concentration. Total RNA Isolation kit did not have good amount of DNA, but same soil sample had really good DNA concentration when extracted by PowerSoil kit.
Does anyone know what is problem here and which result can be more reliable?
Thanks
Milan
What are the ideal levels for Ammonium , Nitrate, Phosphate, Potassium in the soil? or what is the range you'll be looking for while measuring aqueous solutions of soil?
N-fixation by various leguminous and non-leguminous plants is important and its quantification as function of nature of crop, crop growing condition, soil environment, soil N availability and N-addition needs to be evaluated. We wish to know from the experts colleagues on this kind of work done and like to share the publications by the group on this important aspect, as well some of the empirical technical coefficient generators in this regard.
regards.
I have some environmental covariates derived from the digital elevation model (slope, gradient, channel network distance, etc.) in raster format.
I want to identify areas of similarity between the covariates and somehow identify the smallest possible size area (or areas) to serve as a reference area.
- Soil data points will be collected to create predictive models in this reference area.
- The predictive models developed in the reference areas should fit when extrapolated to regions outside the reference area.
- Therefore, the covariates will cover this external area.
I am looking for a relation which may quantify role of rooted soil in controlling the sheet erosion. So far I just have cohesion and friction angle values of rooted soils. Thanks
Hi,
I am interested about how quickly SOM can deplete over time, and would like to start a discussion on the topic. Please pardon me if my question is broad.
In temperate systems, it is common to find annual decomposition coefficients around 1-3% (i.e., 1-3% of the SOM stock is lost after a year). However, I wonder how quickly can SOM mineralization occur.
While reading the literature on SOM changes after deforestation in the tropics, I found values suggesting that SOM stocks can decline by 10-50% in a few years (5-10 years) after a forest is cleared for cultivation.
Also, while looking at the AMG soil organic matter model, I noticed that the potential (maximum) SOM mineralization rate (k0) was set to 29%!
Have you ever asked yourself this question?
Related to this topic, I was thinking of a simple experiment that could shed some light on this question. Let's imagine pots with freshly collected soil or a plot of land, which is outside, and for which any plant development is precluded (removing seed, young seedlings manually). I would be curious to see how quickly SOM changes over time (considering that we would regularly monitor it or regularly SOM contents), given that no plant can inject organic matter. Of course, this soil would be exposed to environmental changes (such as regular water inputs from rain or manual watering, not to let it dry).
Any thoughts about this?
Hi,
I'm looking to do a study utilizing a pH sensor for soil pH measurments, among other variables. Essentially i want to create a embedded system that automatically takes pH soil measurments of a pot from several angles(4 or 8 points around 360 degrees) and depths, to get a more complete understanding of pH across the pot soil profile.
Reading up about soil chemistry, soil pH measurments and how different pH sensors work i understand that it's quite complex. Initially using a mechanical sensor arm take either in situ soil pH measruments, or take out a small sample(done by the arm) and create soil suspension to measure on.
What complicates things quite quickly given the nature of pH measurments with pH electrodes when it comes to necessary procedures for storage, cleaning and measurment(in situ would be preferable). ISFET sensors would be great for this application they can be stored dry, easier to maintain etc(from what i've read), but they are hard to come by if not expensive.
The idea of measuring pH of soil water drainage from different points across the pot would simplify things alot, the arm and mechanical measurment mechanims could be excluded from the design.
However i can't find littarture or articles covering the relation between soil pH and soil water pH in a clear way. Thinking about it, it would be logical to assume that pH from extracted soil water, would for most soils correlate strongly with pH of soil, but not be exact to soil pH of the same spot.
Could anyone enlighten me about this? Or direct me to research articles or littature clearly describing this relationsship?
Best regards,
In order to protect soil, soil biodiversity and enhance its performance, soil treatment is a necessary principle to be done by applying biochar and compost until the soil is in a healthy status. In this regard, I like to receive ideas and tips from researchers to discuss possibilities to monitor and assess the impact of such practical soil measures by considering the study of soil mesofauna.
Wanting to apply fertiliser at a rate of 65, 75, and 90 kg/Ha for a small-scale experiment. Using 1 L pots, 600 g of soil per pot.
How much fertiliser do I apply to each pot?
N = 5, so each treatment uses 3kg of soil.
I have calculated:
75kg/Ha = 4.5g fertiliser per 600 g of soil.
However, I was reading a thesis doing a very similar thing and the person added 0.045g of fertiliser to his 600g of soil.
How did he get this? Obviously he divided it by 100 but why??
My logic is that 1 Ha = 10,000kg then 75kg/Ha = 0.75%
And 0.75% if 600g = 4.5g.
Hi,
I wonder if it is possible to find natural soil carbonates (calcite, dolomite, etc.), not coming from liming, in soils naturally having a low pH (4-5.5).
Is it possible to find these mineral forms of C in acidic tropical soils?
I am asking because while measuring both total C and inorganic C (after acid dissolution) of tropical soil samples from Indonesia with an Elementar, I sometimes get a gap between the two measurements.
Sometimes the gap is positive (total C > organic C), and other times the gap is negative (organic C > total C !?). Generally, total C is equal to organic C, meaning most samples do not show these confusing 2-way gaps, and suggest the absence of inorganic forms of C.
In both cases, I wonder if discrepancies are just technical (noise), or if the gaps between samples are due to the natural variability of my samples, or in some cases, there could be some carbonates present in those soils (which have a relatively low pH of 4-5).
Best,
Thomas
Soil organic carbon is undoubtedly claimed to be the key driver of soil fertility , the consequential effect of which is visible on a whole range of soil properties , thereby, possibly ensuring the better crop performance . Regulating soil carbon is most stupendous task, though , it looks easy ( many would advocate simple application of composts and manures) . In this background, , i propose following questions to our learned colleagues to please enlighten us with your shear wisdom of knowledge :
* How should we enrich the organic matter content of the soil and to retain it as legacy carbon ?
* How shall we regulate different carbon pools of soil vis-a-vis choice of crop?
* How does fallow period jeopardises the net gain in carbon through preceding crops ?
* What are the options of more recalcitrant forms of carbon and their potential role in long term sustainability in crop production ?
Thanks and kind regards
Hi there,
Happy new year!
Thank you for taking time to look at my questions.
I have two questions regarding the use of biochar for synergistically sequestrating carbon and controlling soil heavy metal.
1. Do you know any references about the use of biochar for synergistically sequestrating carbon and controlling heavy metal in soil? (I could not find a good one)
2. Could this be an interesting topic to explore (in your opinion)? Why or why not?
I would appreciate any ideas or suggestions on these two questions.
Many thanks in advance!
Sometimes, in saline soils, we need to make an extract of the soil with a dilution of 10 times or more. What is the actual acidity number of the soil in the absence of dilution and is there a number or a way to correct after dilution
People in our village have some belief of controlling some pest and disease, they apply salt in the rice field, what is its scientific importance.
I'm willing to prepare a loess ( collapsible) soil in order to test it's collapse potential in accordance to the ASTM Standards.
Hello,
I'm searching for some already published articles reporting GHG-Indexes for crops such as Wheat or leguminous forage crops. Possibly under rainfed and Mediterranean climate conditions.
Also, papers that do not directly report the GHG-Index but include both the annual cumulative CO2eq. emissions and crop yield would be OK (e.g., 60 t CO2 eq ha-1 y-1 and 10 t Dry matter ha-1 y-1)
Thank you very much!
We all know that fertilizer increase the OM growth but the application of fertilizer have a great role in this mechanism.. myself Udit want to know about the fertilizer application method and OM content in soil.
Thank you
The idea of a tree belt in Africa may be fine and helpy, but it is also realistic when then land is missing for nourishing the people? In the Kagera district I saw in reality daily GREEN (!) trees cutting people carrying with bicycles from thinning forests only to make for cooking with open fire with green tree stems extremely energy lossy breakfast, lunch or dinner for their families.
I saw the full tree covered Rubondo National Park in Tanzanias Victoria sea, but here where nature is tree covered, no people would find enough human food. But reforestation of cleared areas I find always a good and sustainable practice. If you fly over Tanzania most land is deforested for crops for food production.
Are not models saying that tropical ecosystems will store less carbon in a warmer climate while at high latitudes warming will increase storage of carbon in trees (10.1016/B978-0-12-382225-3.00095-5) ?
So what helps more to help people?
Or people should not be helped and more delivered to their destiny as nature itself does regulation overpopulation and undergoing in a Social Darwinism kind?
Hi, all,
We are studying the adsorption capacity of soils with different particle sizes for Cd. During the study, we are facing a difficulty that “The adsorption capacity should firstly be normalized to the SSA. Then, the size effect for adsorption should be discussed based on it. Otherwise, it is unclear whether the SSA or soil components should be responsible for better adsorption performance.”. We read many papers and ask some groupmates these days, but no one knows how to normalize it.
We would appreciate it if you guys could give us some suggestions. Sincerely, thank you.
I need to model the weak and surface soil as a perfect elastoplastic material with drucker prager behavior in Abaqus, I don’t know how i can use hardening coefficient.
thanks for helps
Sulphate composts are useful for alkaline soils. There are huge amount of sulfur production during refinery processes. Sometimes these amounts of sulfur can not be directly used and should be converted into some other by-products. What is the easiest way to convert organic S into SO4 compost?
Increased runoff under the influence of hydrophobia.
Specific constitutive model for soils, (Simpson is the key name). I will be very grateful for any help.
.How to calculate the shear strain in a multilayer soil profile based on a half-space under a seismic action?
multi angular TerraSAR-X images are available
While adding dashpots error i am getting is the spring/dashpot element is not available.
And should I provide space for soil to flow to other region. I am considering very thin strip of soil and providing earthquake load to it.
And if I am assigning dashpots I would have to assign it to every node(except surface since it's open to air) So what size should I take for the mesh.
I am running a critical state soil model by MS Excel. For the tri-axial compression drained test, I just input the vertical stress increment for a substep while keeping horizontal stress constant. For the tri-axial extension drained test, I keep the vertical stress constant but increase the horizontal stress instead. This gives a well prediction compared to the results in the paper. In the paper, there are also the tri-axial undrained test results for both compression and extension. My question is how to input the model in MS excel to obtain prediction? My idea now is to run that model from the finite element program in couple analysis with undrained mode. To do that it might waste much time to deal with FEM. Is there the way to solve this?
please tell any IS standards for permissible limit of heavy metals in soil?
It has been noted in many researches that gully headcuts are main drivers of gully erosion and upstream migration. Most commonly used definitions describe gully headcut as near-vertical step at which most intense erosion occurs, e.g.:
Rengers and Tucker, 2014. - Headcuts are near‐vertical steps that erode the valley network by migrating upstream over time (Bull and Kirkby , 2002) and add mobile sediment to gully channels downstream (Tucker et al. , 2006).
Vanmaercke et al., 2016. - A gully headcut is a natural, nearly vertical drop in gully channel-bed elevation (Poesen et al., 2003).
Since these are predominately descriptive definitions, I would like to know is it possible to delineate quantifiable definition of a gully headut ?
Such definition would be based on measurements that could be extracted from high-resolution DEM (e.g. required slope angle; headcut horizontal length; headcut height…), rather than on the descriptive, non-quantifiable information.
I understand that such definition would vary depending on local terrain characteristics and characteristics of local gully erosion predisposing factors. But even general quantifiable definition would be very helpful for detection of gully headcuts.
In the attachment is large gully headcut from my research study area, located at Pag Island, Croatia. Within Pag Island large number of small headcuts can be found, that are less distinguishable then the one in this picture.
I'm working on a simple infiltration simulation(coupled stress and pore analysis), as far as I know, I should run the geostatic analysis as the first step.
In the geostatic analysis, I would like to set the specific saturation on the ground surface in the initial, I have been tried a lot of different methods to get a reasonable geostatic outcome that is the Sat, pore, stress is as similar as I sat in initial. But I always cannot do that. I put the information about my method. any suggestion is appreciated.
the way I calculate the value:
- Sat=G*wc/e
- pore pressure from wc by water retention curve
- stress refers to http://www-h.eng.cam.ac.uk/help/programs/fe/abaqus/doc/Geostatic6.doc
I list the different method I have a try below:
1) set predefined fields of pore pressure(elevation distribution linearly), stress(elevation distribution linearly), void ratio (constant) in initial
2) set predefined fields of pore pressure(elevation distribution linearly), void ratio (constant) in initial
3) set predefined fields of pore pressure(constant on the ground surface & bottom), void ratio (constant) in initial
4) set predefined fields of pore pressure(constant on the ground surface), void ratio (constant) in initial
5) set pore pressure(constant on the ground surface) as BC in step1(geostatic ), set predefined fields of void ratio (constant), by this way I can gain the result I want on the ground surface (but not on the bottom) after geostatic, but it always fails in the next step (transient simulation)
all BC are set: fixed x-axis in lateral, fixed y-axis or fixed y-axis & x-axis in bottom
I attached my cae file here
It is known that ther are microbes that can actively cycle-back plastic in some of its forms. <https://rdcu.be/cwsL1>
Do you know any international-national initative to dig into this subject? or any researcher outhere that is interested in colaborating towards the study and application of this?
Cheers!
As our general practice in the rice field show increase in yield, and more vegetative growth, what are the constraints and prospects for its wide application and adaptation in rice, horticultural crops, and many more?
Hi, I am currently trying to extract the pesticides fluroxypyr and prothioconazole from the soil by spiking using Dutch Mini Luke extraction method; however, I am failing. The instrument used for analysis is HPLC-UV.
Here are the details of my extraction (document attached):
1. Extraction method: Dutch Mini Luke
2. Extraction solvent: Combination of four different solvents; 15 mL deionised water, 20 mL of acetone, 20 mL of petroleum ether, and 10 mL of dichloromethane
3. The extracts were dried down and reconstituted using mobile phase.
Instrumentation:
1. Instrument: HPLC-UV
2. Column: C18
3. Mobile phase: A: 5 mM ammonium formate in 0.05 formic acid (aq), B: 0.05% formic acid in acetonitrile
When ran standards alone, fluroxypyr and prothioconazole is detected. However, I am failing to detect both these analytes after extraction, even with multiple ranges of spiking concentration. I am afraid that these analytes are not extracted at all.
Please advise how I can improve or modify my extraction where I can successfully extract these analytes.
Exist there any standard text book in universities for students dealing seriously with amino acid fertilizers as state of the art in plant nutrition ?
Look here, they make much proaganda in Africa with this I this, I think myself pseudo / fake fertilizer and pest regulator but also here in Europe with similar EM (Effectice microorganisms)
Hello,
I am looking for the average trace element concentrations in agricultural soils around the world. Do you know of a good place to start?
Thank you all immensely,
Xavier
We are trying to get the best compression and consolidation in making Compressed Earth Blocks. Any suggestions on how to optimise the soil composition to get best packing density will be most appreciated.
A daily leaching column Nitrogen was conducted to investigate the rate of soil leaching. Now I search for a simple model of equation to represent scientifically the results.
EDIT: Up to the literature suggested in the answers, IT IS NOT POSSIBLE because they are required at least some calibration data, which - in my case - are not available.
I am looking for a technique/function to estimate soil temperature from meteorological data only, for soils covered with crops.
In particular, I need to estimate soil temperature for a field with herbaceous crops at mid-latitudes (north Italy), but the models I found in literature are fitted for snow-covered and/or high-latitude soils.
I have daily values of air temperature (minimum, mean and maximum), precipitation, relative humidity (minimum, mean and maximum), solar radiation and wind speed.
Thank you very much
Permissible limit of different metals in soil, with reference to Indian standard
Can I find a book or research that involves this topic?
Many literatures pointed out that soil sand content has a greater contribution to soil thermal conductivity. However, I couldn't find any models that can quantify soil thermal conductivity using the results of soil particle size distribution. In frozen soils, things seems more complicated considering the phase change of soil water. I want to find a model to express the soil thermal conductivity. I just want to find a soil thermal conductivity model that takes into account both the soil phase change process and the soil mechanical composition
The highly heated viable mud on the furnace(brick) powder doesnot allow any plants to grow?? Why is is unviable? What connect the viability & inviability of soil??
Hi all,
do you know about any commercial service which offers CryoMilling?
We have a few samples of plastics (including e.g. PET) and soils, which we need to cryomill, but since we do not need this service regularly, there is not so useful for us to buy a cryomill.
Thanks in advance for suggestions,
Jan
Hello guys,
I am working on a SWAT2012 project, using QSWAT3. While calculating usersoil table, I used FAO's data and SPAW tools from here(https://www.ars.usda.gov/research/software/download/?softwareid=492&modecode=80-42-05-10). When I got the results, something strange happened. I used its soil water characteristics tool. Compared them with SWAT's generated database, it could match with usersoil_FAO's data while the other one could not matched with usersoil's data.
I wonder how to deal with my soil data, should I just go straight to use data calculated or I should check other things to make sure that my results would be same to usersoil's default value?
Could anyone have ideas about that? I will be really appreciated if you could help me out.
P.S.:
Data and screenshots are provided in the attachments.
Windows Version: Windows 10 Professional 20H2 19042.928
SPAW Version: 6.02.74
QGIS Version: 3.16.5 LTS
QSWAT3 Version: 1.1.1
I need to cultive a set of not previous identified bacterias in a specific soil, provided by the company. How do I do this? Is it possible do add the soil, previously autoclaved, into the medium directly? If yes, how much? Or do I have to do extract first?
Anyone aware of any global/South American/African/South-east Asian maps (rasters or shapefiles) publicly available about soil quality or agricultural potential? Thank you in advance.
We know that the void ratio of soils is affected by increasing temperature. However, the experimental data involved in this topic is rare. From a theoretical aspect, how can we estimate the change in void ratio with temperature, especially unsaturated soils.
I would like to appreciate it if you can provide a calculation method or experimental data on this topic through papers you know.
Bonjour tout le monde,
Je suis à la recherche d'une revue bibliographique sur la matière (ou carbone) organique du sol au niveau du Maroc.
Merci!