Compost Teas for Enhanced Nutrient Cycling: Final Report

This project evaluates compost teas as a biologically based approach to improve nutrient cycling, residue decomposition, and soil health in cropping systems. Researchers combined producer surveys, laboratory analyses, and incubation studies to better understand how compost teas are made, used, and how they function. Surveys of 38 growers highlighted strong interest in improving soil microbiology, reducing synthetic inputs, and increasing crop resilience, while also identifying barriers such as lack of reliable information and equipment. Laboratory analyses characterized microbial communities and nutrient profiles of farm- and lab-brewed teas, showing distinct and consistent bacterial compositions across recipes. Controlled experiments found that certain teas, including vermicompost-based solutions, enhanced residue breakdown, with some treatments achieving 60–70% degradation within 60 days. Results indicate that compost teas may support nutrient availability and soil biological activity, though outcomes vary depending on formulation and brewing conditions. This work provides a foundation for future field trials and development of evidence-based recommendations for producers.