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Questions tagged [soil-moisture]

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How does SMAP detect soil statistics?

So there's a NASA satellite called SMAP currently orbiting Earth right now, and it can measure soil moisture, and detect whether or not soil is frozen or thawed. It knows this since it uses radar to ...
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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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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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0answers
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
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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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18 views

Statistical dependence of mean annual soil evaporation and mean annual precipitation globally

I am studying a simple dynamical system that represents a plant and water system, similar to Klausmeier. In Klausmeier model the mean annual precipitation and the soil evaporation are introduced as ...
3
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1answer
480 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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3answers
84 views

Transformation of soil moisture units

I have soil moisture data from Regional Climate Models expressed in $kg/m^2$. Τhis quantity is the total soil moisture that is estimated for the land column. The depth of this column is dependent on ...
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0answers
30 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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2answers
64 views

Soil moisture conditions and air temperatures - literature needed

I am looking at basics academic papers which tell about the physical floods mechanisms. In particular something that says that: 'lower temperatures reduce evapotranspiration, enhancing wet soil ...
5
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1answer
90 views

How to convert soil moisture units from meteorological model?

I am using the outputs of the ALADIN meteorological model, in particular I need volumetric soil moisture. However, the output from ALADIN is in "funny" units - $\mathrm{kg/m}^2$ per top 1 cm. Is it ...
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1answer
60 views

What's a frost-gley?

I've noticed this term in a book about Pleistocene East Europe. It's apparently a soil which was formed during the interstadials, but that's all my book says, and I can't find much more on the ...
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101 views

Initial indexes for calculating the Fire Weather Index (in the Canadian Forest Fire Weather Index System)

I am applying the Canadian Fire Weather Index (FWI) on the Forest Fire Warning System of my laboratory. My problem is in calculating the Fine Fuel Moisture Code (FFMC), the Duff Moisture Code (DMC) ...
13
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1answer
8k 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 ...
14
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1answer
246 views

Is there a standard definition of a “dry-down” event in hydrology?

When studying the land surface, dry-down periods - periods after rain where the soil moisture is decreasing due to evapotranspiration and drainage - are of great interested, because soil moisture has ...