Comparing Compost and Commercial Fertilizer for Plant and Soil Health in No-Till Cropping Systems

Commodities

Practices

No-till systems offer clear benefits for reducing erosion, building soil structure, and increasing long-term resilience. However, fertility management in no-till remains a persistent challenge, as surface-applied nutrients behave differently without tillage incorporation. Many producers continue to rely on commercial fertilizers for predictable nutrient availability, yet interest is growing in compost as a strategy to enhance soil biological activity, improve nutrient cycling, and reduce dependence on purchased inputs. Despite this interest, there is a lack of practical, on-farm, region-specific data directly comparing compost and commercial fertilizers under no-till conditions. Most existing research is either plot-based, short-term, or conducted outside the context of real farm variability. This creates uncertainty for farmers seeking to balance yield goals with soil-health and economic outcomes. A field-scale, side-by-side comparison of compost and commercial fertilizer in an operational no-till system would provide producers with actionable information on plant performance, yield impacts, soil-health responses, and cost effectiveness. This project aims to fill that gap and support informed nutrient-management decisions grounded in locally relevant evidence.

Solution:

This project will evaluate composted cattle manure as a regenerative fertility option by conducting a replicated, side-by-side comparison with standard commercial fertilizer in a no-till corn system. The goal is to generate clear, practical evidence about how compost influences plant performance, soil function, and economic outcomes relative to conventional fertility practices.

To accomplish this, I will establish a pair of 5-acre plots within fields that share the same soil type, slope, and management history. One plot will receive composted cattle manure applied at agronomically appropriate nutrient rates, and the other will receive commercial fertilizer following standard farm practice, including rate, timing, and placement. All other management-hybrid selection, planting date, population, weed control, and field operations-will remain identical so that fertility source is the only variable.

This approach aligns with regenerative agriculture principles by evaluating inputs that can increase soil organic matter, stimulate biological activity, and improve soil function without disturbing the no-till system. Composted manure has the potential to enhance soil aggregation, water infiltration, nutrient cycling, and biological activity over time. However, farmers need clear data on how compost performs in real-world, large-scale field conditions-particularly in comparison to the predictability and ease of use associated with commercial fertilizer.

The following comprehensive set of measurements will be used to assess plant response, soil health, and economic performance:

• Plant tissue nutrient testing at key growth stages to determine how each fertility strategy influences nutrient availability and uptake.
• Brix readings taken at multiple growth stages to track plant vigor and potential correlations with nutrient source.
• Visual crop health ratings, including color, uniformity, and vigor assessments.
• Yield, measured at harvest using a calibrated yield monitor to ensure accurate comparisons between treatments.
• Haney soil health tests conducted pre-plant and post-harvest to evaluate biological activity, soil respiration, and nutrient-release potential.
• Soil infiltration tests, conducted pre-plant and mid-season, to assess changes in soil structure and water movement.
• Earthworm counts taken before planting and after harvest to evaluate biological habitat and soil ecosystem response.
• Economic analysis, comparing input costs, application costs, and gross margin for each fertility strategy.

Objectives

1. Compare the impacts of compost and commercial fertilizer on plant health, nutrient status, in-season crop vigor using tissue tests, Brix levels, and visual assessments.
2. Quantify yield differences between compost and commercial fertilizer under no-till management using reliable yield monitor data.
3. Evaluate soil health responses to each fertility approach, including biological activity, infiltration, organic nutrient cycling, and earthworm populations.
4. Analyze economic feasibility, including material costs, application costs, potential yield differences, and overall profitability.
5. Share locally relevant results with other producers through Soil and Water Conservation Districts, county agencies, and, if results are compelling, broader agricultural publications.