What is dispersive soil?
In a dispersive soil, the soil aggregates (small clods) collapse when the soil gets wet by fresh water, because the individual clay particles disperse into solution. This collapse of structure causes the soil to slump, lose porosity and become denser, thus restricting root growth of most plants.
How do you fix dispersive soil?
Managing dispersive (sodic) soils
- Avoid disturbing already productive sodic soils.
- Apply lime or gypsum.
- Increase organic matter.
- Use deep-ripping.
- Use raised beds or deepened seedbeds.
- Use alternative plant and land-use options.
What is dispersive clay soil?
Dispersive clay soils are those with unique properties which under certain conditions deflocculate and are rapidly eroded and carried away by waterflow. For dispersive clay soils to erode, a concentrated leakage channel such as a crack (even a very small crack) must exist through an earth embankment.
What makes soil dispersive?
Dispersive soils occur when soil aggregates collapse as individual clay particles disperse into solution when the soil gets wet by fresh water. This collapse of the soil structure causes the soil to slump and lose porosity.
What is the meaning of dispersive?
Medical Definition of dispersive 1 : of or relating to dispersion a dispersive medium the dispersive power of a lens. 2 : tending to disperse. Other Words from dispersive. dispersiveness noun.
What is collapsible soil?
Collapsible soils are defined as any unsaturated soil that goes through a radical rearrangement of particles and great decrease in volume upon wetting, additional loading, or both.
Is sand a dispersive soil?
DISPERSIBLE SOILS: Soils that are structurally unstable and disperse in water into basic particles i.e. sand, silt and clay.
Are all clays dispersive?
To explain dispersion, it is easiest to begin with a simple animation of two dry aggregates of soil dispersing when placed in water. Clays particles are small in size (less than 0.002 mm) but have a very large surface area. The surface area of all clays is negatively charged.
Why do some clays Flocculate and some disperse?
Soil particles will flocculate if the amount of soluble salts in the soil is increased (increased EC), even if there is a lot of sodium. Soil particles may disperse if the amount of soluble salts in the soil is decreased (i.e. if EC is decreased).
What is a dispersive material?
Excerpt from Infrared Fibers and Their Applications. All dielectric materials are dispersive. This means that the refractive index varies with wavelength, i.e., n = f(λ). This may be seen in the typical dispersion curve for a dielectric material (NaCl) shown in Fig.
What is another word for dispersion?
What is another word for dispersion?
| scattering | dispersal |
|---|---|
| dissipation | diffusion |
| distribution | spreading |
| disbandment | thinning out |
| dissemination | spread |
What is the problem of collapsible soils?
The soil structure may collapse inwards (consolidate), as in loess failure, or it may collapse outwards (disperse, disintegrate), as in the failure of quick-clays, some collapsing sands, some silty estuarine deposits, and in wind erosion of silty soils by saltating sand grains.