Soil Problems And Their Management Flashcards
1
Q
What is soil erosion?
A
The wearing away of the top layer of soil
2
Q
How many tonnes of top spoil are lost each year?
A
75 billion tonnes
3
Q
What is rill erosion?(rainfall)
A
Rainfall doesn’t soak into soil, gathers on surface and runs downhill
4
Q
What is sheet erosion?
A
Raindrops loosen soil, overland flow transports topsoil in a uniform fashion
5
Q
How does repeated erosion reduce fertility of soils?(3 reasons)
A
- removes top soil(rich in nutrients)
- reduction in depth of soil
- reducing infiltration of water into soil
6
Q
What can repeated erosion lead to?(3)
A
- loss of seeds
- plants being sandblasted
- increased difficulty of field operations
7
Q
How is the reduction of amount of surface flow of water done?
A
- installing field drains
- early sowing of soils
- contour ploughing
