Negative Soil Pollution:
It includes over use of soli and erosion. Erosion of soil is caused by two factors, water and air. Water erosion is found near the hills where high speed rivulets and flood removes top soil. Soil erosion also occurs by high speed winds which brings sand particles from dry desert.

Positive Soil Pollution:
It is pollution caused by (i) pesticides, herbicides, and fumigants (ii) chemical fertilizers and (iii) air pollutants washed down from atmosphere through rain.