soil

SOIL;
Soil is the upper layer of the earth that may be dug or ploughed and in which plants grow. "or".
The upper layer of the earth which is composed of different thin rock particles is helpful in the growth of vegetation and  plants that is called soil.
The soil science society of pakistan SSP works to advance the displine and practice of soil science by acquiring and dissminating information about soils in relation to crop production, enviroment quality ecosystem sustainability bioremediation waste management and recycling.
BASIC COMPONENTS OF SOIL; 
Soil has been three basic components.
1.Solid particles like salt ,minerals and organic matter.
2.Air.
3.Water.
PARENT MATERIAL;
The soils of pakistan are derived from three types of parent material.
Residual material obtained from weathering of underlying rocks,Most of the rocks are calcareous.In some areas granites have produced non calcareous soil material.
1.very small quantities of salts are released from most of the rocks.The soils are therefore essentialy non saline.
2.alluvium; those materials which are transported from one place to another by rivers and deposited at other places are called alluvium.
3.aeolian soil; similarly wind also transport the material from one place to another which is deposited over the surface that is called aeolian soil.
SOIL CLASSIFICATION ON THE BASIS OF PARENT MATERIAL AND MODE OF INFORMATION;
The soil of pakistan have accquired distinct characteristics from the parent material and by their mode of formation. Accordingly the soils of pakistan can be classified into the following six types'
1.alluvial soil of the flood plains
2.alluvial soil of the bar uplands
3.soils of the piedmont plains.
4.desert soils
5.soils of potwar plateau
6.soils of western hills..............