Normally C : N : S ratio of soil is:

• The ideal or "normal" Carbon to Nitrogen to Sulfur (C:N:S) ratio in soil is generally considered to be around 100:10:1. This ratio is important for several reasons:
-Microbial Activity: Soil microbes need carbon for energy and nitrogen for building proteins. A balanced C:N ratio ensures efficient decomposition of organic matter and nutrient release.
-Nitrogen Availability: When the C:N ratio is too high (e.g., when adding materials like sawdust or straw), microbes will consume available soil nitrogen, leading to temporary nitrogen deficiency for plants.
-Sulfur Availability: Though often overlooked, sulfur is essential for plant growth and plays a role in various metabolic processes.
Key point-

• Organic Matter:
C:N Ratio = 20:1

• Humus:
C:N Ratio = 10:1

• Normal Soil:
C:N Ratio = 10:1 to 12:1

• FYM (Farmyard Manure):
C:N Ratio = 20:1

• Microorganisms:
C:N Ratio = 4:1 to 9:1

• Leguminous Crop (e.g., legumes):
C:N Ratio = 20:1

• Crop Straw:
C:N Ratio = 100:1

• Wood Sawdust:
C:N Ratio = 400:1

• Carbon in Soil (Yindia soil):
-0.5% Carbon found (This seems like a percentage, which is different from a C:N ratio but indicates the organic carbon content in the soil)