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Kawea Community Garden: Boosting Soil Diversity with a Johnson-Su Bioreactor

Jacopo orazi

Updated: Dec 23, 2024




When Chrissy from Kawea Community Garden reached out for support, Radice Soil Solutions partnered with the garden to develop innovative solutions for improving soil health. Together, we implemented a Johnson-Su Bioreactor to boost soil organism diversity and laid plans for a liquid fertilizer and biological spray cover to promote a thriving garden ecosystem.


What is a Johnson-Su Bioreactor?


The Johnson-Su Bioreactor is a passive composting system designed to produce biologically rich, fungal-dominant compost. Unlike traditional methods, this approach avoids turning, ensuring minimal disturbance to the composting process. Key features include:


  • Aerobic Composting: Vertical aeration pipes maintain oxygen flow to support microbial activity.

  • Moisture Control: Regular hydration promotes microbial growth without waterlogging.

  • Fungal Dominance: Long-term composting (up to a year) encourages fungal colonization, critical for improving soil structure and nutrient cycling.


The result is a high-quality compost teeming with diverse microorganisms, perfect for enriching garden soils.


Expanding the Project


To complement the bioreactor’s output, we’re developing:

  • Liquid Fertilizer: A nutrient-rich solution derived from compost extracts to provide plants with an immediate nutrient boost.

  • Biological Spray Cover: A protective foliar spray with beneficial microorganisms to improve plant health and resilience against pests and diseases.


Creating a Thriving Garden


This partnership aims to establish a garden ecosystem that supports diverse soil life and healthy plant growth. By using innovative composting techniques and biological solutions, Kawea Community Garden is setting a benchmark for sustainable gardening practices.





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Honored to be finalist for Entrepreneur of the Year at GEN NZ 2024, "driving innovation for healthier soils and a sustainable future".

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