GoKawiilSwitch Bioworks engineers microbes with a nitrogen-fixing on/off switch for crops
Startup Switch Bioworks is developing genetically engineered soil microbes designed to first colonize plant roots and grow into robust populations before switching into nitrogen-fixing mode. The approach aims to solve a longstanding problem in biological fertilizers: microbes that spend too much energy converting atmospheric nitrogen into usable ammonia often fail to establish themselves around crop roots. Founder Tim Schnabel says the company is testing this genetic switch technology in early cornfield trials.
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Synthetic fertilizer production via the Haber-Bosch process is energy-intensive and a major source of greenhouse gas emissions, so a reliable microbial alternative could meaningfully cut agriculture's carbon footprint and input costs. Previous biological fertilizer efforts have struggled because microbes forced to prioritize nitrogen fixation too early can't grow enough to be effective at scale, making Switch's sequencing strategy a potentially important technical breakthrough if it holds up in field trials.
- Switch Bioworks uses a genetic switch to delay nitrogen fixation until microbes establish healthy root colonies.
- The method addresses a core flaw in prior microbial fertilizers: energy trade-offs between growth and nitrogen production.
- Early trials are underway in cornfields, testing whether engineered microbes can supplement or reduce synthetic fertilizer use.
Down To Earth Organic Blood Meal Fertilizer — While startups work on engineered nitrogen-fixing microbes for farms, home gardeners can get their nitrogen the old-fashioned biological way. Down To Earth's blood meal is a classic organic nitrogen source that greens up leafy crops and feeds soil life, and it pairs nicely with legume cover crops that host their own nitrogen-fixing bacteria.
See Down To Earth Organic Blood Meal Fertilizer on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: technologyreview.com — Casey Crownhart, 2026-09-01
Published there as: “How engineered microbes could help feed the world’s crops”
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