Post on 10-Aug-2015
DID U KNOW To UNDERSTAND SOIL
ByAllah Dad Khan
(seventh Presentation)
oA
E
B
C
R
TOP SOIL
SUBSOIL
Sagebrush-Cold Desert
What are the main components of soil?
1. Mineral Matter2. Air3. Water4. Organic Matter
Soil Components (volume basis)
Note: clays are microscopic in size !
Soil separate particle diameter (mm)____________________________
Sand . . . . . . . . . 2.0 - 0.05
Silt . . . . . . . . . . 0.05 - 0.002
Clay . . . . . . . . . . <0.002
SAND
SILT CLAY
Clay mineralsphotographedwith an electronMicroscope.
Note: they are plateor flake like andare stacked on topof each other.
They are electricallycharged and act likemagnets that attractand hold plantnutrients.
What are the FACTORSthat make SOIL?
TIME1000’S TO 10,000’S OF YEARS
LAY OF THE LANDTOPOGRAPHY
LIVING ORGANISMSANIMALS AND PLANTS
CLIMATEHOT/COLD, WIND/RAIN
PARENT MATERIALROCKS AND MINERALS
Physical land features
What are some practicesOf
SOIL CONSERVATION?1.Terracing2.Strip Cropping3.Contour Plowing4.Tilling5.Wind Breaks6.Ground Covers