Algae
in
Soil - Algae are generally found on the surface of moist soils, where there is sufficient light for their photosynthetic reactions. The major types present are green algae Chlorophyceae, and the diatoms (Bacillariophyceae),
Their total numbers vary from several hundreds to several thousands. In some situations their number is quite large and brings about beneficial changes, especially desert soils. They fix nitrogen in paddy soils used for cultivation of rice.
