Tuesday 15 September 2026
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Startup Switch Bioworks aims to cut fertilizer emissions with engineered microbes

Genetic switch approach could help microbial nitrogen fixers thrive in soil, reducing reliance on synthetic fertilizer

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By LineZotpaper
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A growing body of research suggests that engineered microbes could help feed crops by providing nitrogen directly, potentially reducing the need for synthetic fertilizer — a major source of greenhouse gas emissions. Startup Switch Bioworks is developing a novel genetic switch that allows microbes to establish healthy colonies before shifting into nitrogen-producing mode.

Fertilizer is essential for the global food supply, but its production is energy-intensive and accounts for roughly 2% of global greenhouse gas emissions. The Iran war has sent energy and fertilizer prices skyrocketing in recent months, adding urgency to efforts to find alternatives.

Synthetic fertilizer is produced through the Haber-Bosch process, which uses natural gas to convert nitrogen from the air into ammonia. But nature already has a solution: certain microbes can fix nitrogen — converting it into reactive compounds like ammonia that plants can use. Some plants, such as legumes, even house nitrogen-fixing bacteria in their roots.

Startup Switch Bioworks is betting on a genetic switch to overcome a key challenge that has plagued microbial fertilizers. The problem is that producing ammonia is energetically expensive for microbes, so putting energy into nitrogen fixation can hamper their growth. To be effective, microbes need to first establish colonies around plant roots.

“We have to reinvent fertilizer,” said Tim Schnabel, the company’s founder and CEO.

Switch Bioworks’ approach uses a section of DNA that controls when genes are activated. The company is working on several ways to trigger the switch, with the leading option being a response to nitrogen levels in the soil: once nitrogen drops to a certain point, the microbes begin producing ammonia.

Biological fertilizers are not new — humans have used manure for millennia, and companies have long developed microbial fertilizers, including genetically engineered versions. But achieving reliable, scalable nitrogen fixation in the field has proven difficult. Switch Bioworks is currently conducting early trials in corn fields, and the company believes its genetic switch approach could make microbial fertilizers commercially viable at scale.

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Analysis

Why This Matters

  • Fertilizer production accounts for roughly 2% of global greenhouse gas emissions, and the Iran war has driven energy and fertilizer prices sharply higher, squeezing farmers.
  • If successful, engineered microbes could reduce dependence on synthetic fertilizer, cutting emissions and lowering costs for farmers.
  • The technology could also improve food security by making nitrogen fixation more accessible in regions where synthetic fertilizer is expensive or unavailable.

Background

Synthetic fertilizer relies on the Haber-Bosch process, which fixes nitrogen under high heat and pressure using natural gas. This process is responsible for feeding billions of people but is a major source of carbon emissions. In nature, nitrogen-fixing bacteria convert atmospheric nitrogen into forms plants can use, but these microbes are not typically present in the soil around major crops like corn and wheat. For decades, scientists have tried to engineer microbes that can provide nitrogen in agricultural settings, but the energetic cost of ammonia production has made it difficult for the microbes to compete and thrive in the soil.

Key Perspectives

Switch Bioworks: The startup believes its genetic switch approach solves the colonization problem by allowing microbes to grow first and then switch on nitrogen production when conditions are right. CEO Tim Schnabel argues that “we have to reinvent fertilizer” to address both environmental and economic pressures.

Farmers and agricultural industry: Farmers could benefit from lower fertilizer costs and reduced emissions, but adoption will depend on the reliability and cost-effectiveness of microbial products compared to synthetic alternatives.

Critics and skeptics: Previous attempts at microbial fertilizers have struggled with scalability and consistency. The energetic demands of nitrogen fixation remain a fundamental biological constraint, and field conditions vary widely. It remains to be seen whether genetic switches can deliver reliable performance across different crops and climates.

What to Watch

  • Results from Switch Bioworks’ early corn field trials, which will indicate whether the genetic switch works in real-world conditions.
  • The response from the fertilizer market if energy prices remain high — this could accelerate demand for biological alternatives.
  • Regulatory approval pathways for genetically engineered microbes used in agriculture, which may vary by country.
  • Potential partnerships or acquisitions by major agricultural companies as the technology matures.

Sources

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Articles published under the Zotpaper byline are synthesized from multiple source publications by our AI editor and reviewed by our editorial process. Each story combines reporting from credible outlets to give readers a balanced, comprehensive view.

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