Lemongrass Seed Treatment Failed in Soil Trials
Nanoemulsions inhibited pathogens in the lab but lacked effectiveness in soil-based corn seed testing.
Updated on Oct. 5, 2026 in Botany
Live Poll
Do you believe natural essential oil treatments are a reliable way to protect agricultural crops?
Researchers evaluated alginate-based nanoemulsions containing lemongrass essential oil as a protective seed treatment. While the formula successfully inhibited fungal pathogens in laboratory settings, it demonstrated limited efficacy when tested in soil.
Why it matters
Seed treatments are intended to protect crops during germination, but this research highlights the gap between in vitro performance and real-world agricultural conditions. The finding suggests that current nanoemulsion formulations may struggle to maintain antifungal properties when exposed to complex soil environments.
The study utilized lemongrass essential oil concentrations of 5%, 10%, and 20% to create nanoemulsions with droplet sizes of 111-128 nm and a polydispersity index of 0.20 to 0.32. These formulations maintained stability for 90 days.
The details
The team prepared alginate-based nanoemulsions—sub-microscopic droplets of oil suspended in a water-based polymer derived from brown algae—to encapsulate the lemongrass oil. While pure essential oil often reduces corn seed viability, these nanoemulsion treatments preserved germination rates. Researchers tested the performance against common pathogens including Fusarium graminearum, a fungus causing seedling blight, and Pythium sylvaticum, a mold-like organism that causes root rot, to assess protection levels during early seedling development.
Timeline
90 days: The duration for which the produced nanoemulsions maintained stable droplet sizes.
The Tech Race
The development of stable, plant-derived antimicrobial delivery systems is a critical area in sustainable agriculture. This study demonstrates a common bottleneck in that research, where optimized lab results fail to translate to the complex conditions of the soil microbiome.
This research remains at the laboratory-testing stage and does not offer a commercially viable alternative to conventional fungicides for farmers. Future work must address formulation dynamics at the seed-soil interface before such treatments can be considered for field application.
The takeaway
This study highlights the persistent difficulty of moving biopesticide delivery systems from the lab to the field. Researchers will need to determine how soil interactions alter the stability and release profile of these nanoemulsions to improve future efficacy.
Further reading
For more on the latest research in agricultural plant science, visit the Botany section.
Source note: This article includes information reported by Nature.
Live Poll
Do you believe natural essential oil treatments are a reliable way to protect agricultural crops?
