C:N Ratio Test
Evaluate Carbon-to-Nitrogen Balance for Composting Efficiency and Nutrient Value
A Key Indicator of Compost Maturity and Performance
The carbon-to-nitrogen ratio (C:N ratio) is one of the most critical indicators of compost quality. Whether you're composting livestock manure, plant residues, or food waste, the ideal C:N ratio helps determine how efficiently your compost breaks down and how well it will support soil microbial life.
This test gives you a fast, accurate measurement of the total carbon and nitrogen content in your compost sample, allowing you to fine-tune your inputs or verify that your finished product is ready for soil application.
What This Test Measures
- Total Carbon (%)
- Total Nitrogen (%)
- Carbon-to-Nitrogen Ratio (C:N) – Reported as a simple ratio value
Results help you determine if your compost is:
- Too rich in carbon(slow decomposition, low nutrient availability)
- Too high in nitrogen(risk of odor, ammonia volatilization, or burn)
- Properly balanced for microbial activity and plant-friendly release
Sample Submission Requirements
- Minimum Sample Size: 3–4 cups of finished or in-process material
- Packaging: Clean, sealed plastic bag or container
- Turnaround Time: 4- 5 business days from lab receipt
Ideal For:
- Compost producers monitoring batch consistency
- Farmers using on-farm composting systems
- Soil amendment manufacturers ensuring balanced blends
- Consultants evaluating input materials for C:N compatibility
- Organic growers optimizing microbial health and nutrient cycling
Order the C:N Ratio Test Today
Balance matters.
Get fast, accurate insight into your compost’s nutrient potential and decomposition dynamics.
Frequently Asked Questions
- What are your business hours?
Our office is open Monday thru Friday from 8 am to 5 pm. We do close for major holidays, so we recommend ordering your testing and sending your sample early if a holiday is coming up. You can always reach us by email. Just send us a message at info@tpslab.com
- When will I get my results?
We understand that you need your results as soon as possible. That is why we make sure to begin processing your samples as soon as they arrive at our laboratory. When the results are ready, we will email them to the email address you provided on your submittal form. The list below will give you an idea of our usual turnaround times.
Soil Tests: 5-7 Business days
Water Tests: 5 - 7 Business days
Plants Tests: 24 - 48 Hours
Compost Tests: 7 - 14 Business days
Fertilizer Tests: 3 - 5 Business days
Heavy Metals Test: 7 - 14 Business days
We offer a rush option for an additional 50% of the testing cost, but we would encourage you to give yourself time to test before you get to a point where a rush is needed.
