2. Soil Science

3. Where does soil come from?
Rocks
Minerals
Organic Matter

6. What are the main components of soil?
Mineral Matter
Air
Water
Organic Matter

8. Soil Particles
Note: clays are microscopic in size !

10. Clay minerals
photographed
with an electron
Microscope.
Note: they are plate
or flake like and
are stacked on top
of each other.
They are electrically
charged and act like
magnets that attract
and hold plant
nutrients.

11. Organic matter is soil gold !

12. What causes soil erosion?
Water
Wind
No Vegetation

13. Rain drop erosion

14. The Great Dust Bowl
Wind Erosion

15. The Great Dust Bowl

16. Clouds of Silt

17. Wind Erosion removed topsoil

18. Vegetation protects soil

19. Our lives depend on preserving our topsoils.

20. What are the FACTORS that make SOIL? TIME LAY OF THE LAND
1000’S TO 10,000’S OF YEARS
LAY OF THE LAND
TOPOGRAPHY
LIVING ORGANISMS
ANIMALS AND PLANTS
CLIMATE
HOT/COLD, WIND/RAIN
PARENT MATERIAL
ROCKS AND MINERALS

21. SOIL CONSERVATION? Terracing Strip Cropping Contour Plowing Tilling
What are some practices Of
SOIL CONSERVATION?
Terracing
Strip Cropping
Contour Plowing
Tilling
Wind Breaks
Ground Covers

23. Strip Cropping
Contour Plowing

24. Contour Farming

25. Contour Farming

26. Strip Cropping

27. Strip Crop Farming

28. Soil - We cannot live without it!