Roles of microorganisms in soil fertility ( threshold of soil fertility and microorganisms role to achieve soil fertility

1. Presentation by
Ashmita Sapkota
Ashmita Bhatta
Ashok Panjiyar

2. Hyella caespitosa

3. Microorganisms
•Microscopic
•Antonie Van Leeuwenhoek
•Classification

4. •Soil
•Fertility

5. •Rich in nutrients
( includes nitrogen, phosphorus and potassium)
•Contains adequate minerals such as boron, chlorine, cobalt, copper, iron, manganese,
magnesium, molybdenum, sulphur and zinc
•Contains minerals promote plant nutrition
• Contains soil organic matter that improves the structure of the soil(enables the soil to
retain more moisture)
• soil pH is in the range 6.0 to 6.8
•has a good soil structure which results in well-drained soil
•Consists of a variety of micro-organisms that support plant growth.
•Often contains large amounts of topsoil

6. Microbial products

7. Recently, few microbial strains were isolated who had an ability to oxidize in
the first step Fe2+ from primary phyllosilicates mineral in such a way that they
release iron and K from these minerals
Nitrogen fixation, role in nitrogen cycle
Source: sciencedirect

8. Soil Organic matter decomposition
Organic matter nutrient manipulation

9. • microbes solubilize P by lowering the pH (through proton extrusion) of
external medium and producing low molecular weight organic anions

10. Various microbes present in soil involves in several nutrient cycle and
decomposition several macromolecules liberates nutrients to the plant
and takes part in soil food web
Source: theconservation.com

11. Hence…..