1. What is the WSU Compost Mix Calculator?

The WSU Compost Mix Calculator helps determine the optimal mix of carbon and nitrogen materials for effective composting based on the desired carbon-to-nitrogen (C:N) ratio.

2. How Does the Calculator Work?

The calculator uses the compost mix formula:

Where:

• Carbon materials — Volume of carbon-rich materials (browns)
• Nitrogen materials — Volume of nitrogen-rich materials (greens)
• Ratio — Desired C:N ratio (typically 25-30:1)

Explanation: The equation calculates the total volume of compost materials needed to achieve the desired carbon-to-nitrogen balance.

3. Importance of C:N Ratio

Details: The carbon-to-nitrogen ratio is crucial for efficient composting. A ratio of about 30:1 provides the right balance for microbial activity, decomposition speed, and nutrient retention.

4. Using the Calculator

Tips: Enter the volumes of your carbon and nitrogen materials, and your desired C:N ratio (typically 30:1). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What are examples of carbon materials?
A: Dry leaves, straw, wood chips, sawdust, paper, and cardboard are common carbon-rich "brown" materials.

Q2: What are examples of nitrogen materials?
A: Fresh grass clippings, vegetable scraps, coffee grounds, and manure are nitrogen-rich "green" materials.

Q3: Why is 30:1 the recommended ratio?
A: This ratio provides the ideal balance for microbial activity - enough nitrogen for protein synthesis and enough carbon for energy.

Q4: What happens if the ratio is too high or too low?
A: Too high (excess carbon) slows decomposition; too low (excess nitrogen) can cause odor and nutrient loss.

Q5: How should I measure materials?
A: Use consistent volume measurements (e.g., buckets or wheelbarrows) for both carbon and nitrogen materials.