Soil physics & biology

23 important questions on Soil physics & biology

How could you improve a dry soil?

With irrigation (bewatering)

How could you improve a poor soil?

With fertilizers (kunstmest)

How could you improve an unstable soil?

With lime (kalk or CaCo3)
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

How could you improve a saline (salty) soil?

With drainage, cropping (sugarbeets for example)

How could you improve an impermeable soil?

With deep ploughing

How could you improve an low bearing soil?

To put sand on the top layer

Where does AP stand for? (from a mineral horizon)

It is a mineral horizon that is ploughed

Which two types of Organic orizons are there?

The O-horizon and the H-Horizon

On which number is the wilting point?

4,2

What is the H horizon?

Peat, or clayey peat (permanent wet conditions)

What is the definition of clay redistribution?

Chemical and physical processes of mobilisation, transport and precipitation of clay

How do soils form?

Weathering (verwering)

What happends within Weathering?

Breakdown of stones into smaller sized particles driven by physical, chemical or biological forces.

What happend with loose particles within the weathering phase?

They change into soil

Is weathering reversible? (omkeerbaar)

No

What happends within Erosion?

Movements of materials at the surface of land, in general. Loose particles on rock, stones, pebbles etc. By wind or water (runoff) or during landslides, avalanches and earthquakes (aardverschuiving, lawines, aardbeving)

By which physical reactions is erosion influenced?

Pressure release/maintain
strong temperature fluctations (schommeling)
chemically unchanged

By which chemical reactions is erosion influenced?

Transformation of primary to secondary minerals
chemically different

By which biological reactions is erosion influenced?

Impact of soil organisms
tree roots growth in cracks (boomwortelgroei in scheuren)

What happends with physical weathering and erosiveness?

- formation of soil particals
- posibility for root growth
- water storage and underground transport (functions as a buffer, can prevent erosion)
- increased effect of chemical erosiveness via larger surfaces

What happends with chemical weathering and erosiveness?

Contact of primairy minerals with water, co2,02 and organic acids
gives formation of secondary minerals

What happends with biological weathering and erosiveness?

Long been neglected (verwaarloosd)
- smaller organisms, unicellular, funghi
- make nutrients available for plants e.g. Phosphate
- contribute to formation of clay-humus complex

Where does GIS stand for?

Geographical information system

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo