Through a serie of small experiences, this video will show the basic principles governing water flows. A video inspired by Gardner W.H and Hsieh J.C., Water Movement in Soils (vidéo), Washington State University, 1959.
I come back to this video every once in a while. It is of such great pedagogical value! It really helped me with the understanding of soil physics. Love that you included the example with aggregates, just goes to show how the soil properties are not only dependant on texture, but also structure. Thank you very much!
This is very informative. I am amazed at how much time and effort is put into study these things. Surely even the set up requires pain staking attention to detail.
This is golden!!! I'm am currently doing a master's thesis looking into moisture migration in grouting and tile adhesive in bathrooms walls. This video shows an excellent representation into the behavior between materials with different permeability and porosities. I can highly relate to the observations regarding the different layers. Thank you for this, and I will contact your University to ensure proper citations. Thanks from Norway!
Did anyone take into account the compaction layers that were created between the glass plates? This study is actually a great representation of the erosion issues humans have had in the entire history of agriculture with waterlogging on top of compaction layers created by humans.
This was like a month of classes in 15 minutes.... English isn't your first language and you can still teach multiple magnitudes better than most American professors
Thank you for the video. I'm about to start a grafted finger lime garden, and didn't know what sort of soil to use. I think I'll go with sandy loam ("portulaca-mix") soil now instead of the 5-in-1 soil commonly found over here.
High IQ gardening theory crafting: Make a channel of sand underground under each row of vegetables and have the sand channel come up like a pipe in different spots. Pour water into these sand "pipes" and the water should flow under the plants and hydrate the surrounding dirt from the hydrostatic pressure. Significantly less evaporation, but more work to start off.
I would like to reproduce your experiment with a numerical code. Did you measured the hydraulic characteristics of the soil you used ? Thank you in advance for any help.
irrigation+rainfall = evaporation + transpiration + runoff + leaching Which one of these processes do Farmers really have control over during the growing season? If you have the ability to irrigate your sandy soils and water is cheap and plentiful, then you are fortunate and have some control on the left side of the equation. If you do not have irrigation, you must look at the factors on the right side of the equation to see what can be controlled or minimized to benefit your crop. Evaporation from the soil surface can be reduced with mulch or leaving crop residue on the soil surface. Transpiration is a function of the plant leaf surface area and the weather. Runoff is or should be minimal in sandy textured soils with high percolation rates. This leaves the leaching of water out of the root zone as the #1 controllable loss of moisture to your crop. Interrupting the downward movement of moisture in your soil by installing a "smart" barrier can greatly reduce the leaching of water and nutrients. SWRT subsurface membranes detain/retain up to 90% of irrigation or rainfall in the root zone for crop use by disrupting the gravitational movement of water in the soil while still allowing excess water to percolate and do not create anaerobic soil conditions.
"The practice of taking someone else's work or ideas and passing them off as one's own." The previous work was clearly cited. This is a new, high quality production of that work, which was originally made at a publicly funded university. This is not plagiarism.
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We have clay soils that absorb water at fast rates because it is no till forming large aggregates over time When not dry the absorption is faster. It is like a moist sponge over one that is dry. With many acres being no till in modern agriculture your experiments are not true in the real world.
