The document discusses the decomposition process of organic manure in soil, noting that decomposition is driven by soil microorganisms and fauna breaking down dead plant and animal materials and releasing inorganic nutrients back into the soil. It describes the roles of decomposers like earthworms and microbes, and the three main processes of decomposition: assimilation, immobilization, and mineralization. Finally, it outlines several advantages of decomposition for soil properties and fertility.

1. DecompositionProcessinOrganicManure
PRESENTED BY- PRESENTED TO-
ABHINANDAN KUMAR MR. JAGRAJ SINGH
B.Sc(Hons) Agriculture Assistant Professor
A1-T1 Dept. of Agriculture
18042600148 Quantum University, Roorkee

2. CONTENTS
 Decomposition
 Decomposers
 Processes
 Advantages

3. DECOMPOSITION
Breakdown of dead plant and animal material and
release of inorganic nutrients.
Decomposition is a biological breakdown and
biochemical transformation of complex organic
molecules of dead material into simpler organic and
inorganic molecules.

4. DECOMPOSERS
 Soil Fauna:-
• Earthworms, Arthropods.
• Fragmentation increases surface area.
• Distributes OM within soil profile.
 Soil Microorganism:-
• Heterotrophic bacteria, Fungi.
• Drive energy, carbon and nutrients from dead OM in the
process they release CO2 through respiration.

5. PROCESSES
Three main processes of decomposition-
I. ASSIMILATION
II. IMMOBILIZATION
III.MINERALIZATION

6. ASSIMILATION
 Conversion of substrate materials into
protoplasmic materials.
 E.g. OM carbon to microbial carbon.

7. IMMOBILIZATION
 Conversion of organic substances into
inorganic form.
 E.g. Protein from OM will be converted to
inorganic nitrogen in the soil.

8. MINERALIZATION
Conversion of inorganic form into organic
form.
E.g. Inorganic nitrogen from the soil
converted into microbial protein.

9. ADVANTAGES
 Increase soil fertility.
 Improve soil aeration.
 Improve water holding capacity.
 Nutrient cycling.
 Maintenance of soil structure and texture.
 Increase diversification of microorganisms in soil.