1. What is the CN Ratio?

The CN Ratio (Carbon-to-Nitrogen Ratio) is a measure of the relative amounts of carbon and nitrogen in a substance. It's widely used in agriculture, soil science, and composting to assess organic matter quality and decomposition rates.

2. How Does the Calculator Work?

The calculator uses the CN Ratio formula:

Where:

• \( Total\ Carbon \) — Percentage of carbon in the material
• \( Total\ Nitrogen \) — Percentage of nitrogen in the material

Explanation: The ratio compares the amount of carbon to nitrogen in a given material, which affects decomposition rates and nutrient availability.

3. Importance of CN Ratio

Details: The CN ratio helps determine:

• Decomposition rate of organic matter
• Nitrogen availability in soil
• Suitability of materials for composting
• Potential for nitrogen immobilization

4. Using the Calculator

Tips: Enter the percentage values for total carbon and total nitrogen. Both values must be greater than 0. The calculator will compute the ratio of carbon to nitrogen.

5. Frequently Asked Questions (FAQ)

Q1: What is an ideal CN ratio for composting?
A: The optimal range is typically 25-30:1 for efficient decomposition while minimizing nitrogen loss.

Q2: What does a high CN ratio indicate?
A: High ratios (>30:1) indicate carbon-rich materials that decompose slowly and may temporarily tie up nitrogen.

Q3: What does a low CN ratio indicate?
A: Low ratios (<20:1) indicate nitrogen-rich materials that decompose quickly but may lose nitrogen through volatilization.

Q4: How is CN ratio used in agriculture?
A: Farmers use it to balance crop residues and fertilizers to maintain soil fertility and organic matter.

Q5: What are typical CN ratios for common materials?
A: Fresh manure (15:1), grass clippings (20:1), leaves (60:1), straw (80:1), sawdust (400:1).