Anthropocene Magazine · Climate & nature

Purple Bacteria as a Sustainable Fertilizer Alternative

A new study explores the potential of marine purple bacteria to replace synthetic nitrogen fertilizers, offering a more environmentally friendly approach to agriculture.

Synthetic fertilizers, crucial for global food production, contribute significantly to CO2 emissions. An alternative approach using purple bacteria, commonly found in aquatic environments, is being investigated. These bacteria can be cultivated, processed into powder, and used to enhance crop yields.

The overuse of synthetic fertilizers has led to soil acidification and environmental damage, including algal blooms that harm aquatic ecosystems and the release of potent greenhouse gases like nitrous oxide (N2O).

Researchers at Kyoto University have focused on Rhodovulum sulfidophilum, a marine purple bacterium. This bacterium naturally fixes nitrogen from the air as it grows, a process that could bypass the energy-intensive industrial production of synthetic fertilizers.

Previous experiments showed that dried R. sulfidophilum improved crop growth similarly to synthetic fertilizers. In 2025, a cost-effective method for large-scale cultivation in diluted seawater was developed.

The latest study tested this 'purple-PB' fertilizer on broccoli fields. It demonstrated comparable yield and nitrogen content increases to synthetic fertilizers.

Laboratory tests indicated that purple-PB releases nitrogen more slowly into the soil, reducing N2O emissions by 15-73% in the initial six days compared to synthetic alternatives.

This 'Purple Revolution' could offer a sustainable path for agriculture, potentially mirroring the impact of the Green Revolution but with reduced environmental consequences.

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