Tomsk Polytechnic develops halloysite-based nanofertilizer that boosts plant growth

Researchers at Tomsk Polytechnic University (TPU), in collaboration with international partners, have developed a nanocomposite fertilizer based on halloysite, a naturally occurring aluminosilicate mineral. Laboratory experiments showed the fertilizer significantly stimulated plant growth when applied to arugula microgreens, increasing plant height by up to 84% and dry biomass by 26–42% compared to untreated samples.

The study, published in Microporous and Mesoporous Materials, expands on the nanofertilizer that uses halloysite nanotubes extracted from Russian deposits and supplied by the Halloysite-Ural company. These nanotubes were infused with copper chelate, boric acid, and iodine to create the active composite material.

According to Maxim Rudmin, associate professor at the TPU School of Engineering and Technology and lead researcher on the project, the modified halloysite nanotubes underwent morphological changes, with diameters increasing from 96 nanometers to between 165 and 270 nanometers. “These transformations confirm the successful incorporation of nutrients into the macro- and mesopores of the mineral structure,” Rudmin said.

The nanofertilizer was applied as a foliar spray on arugula microgreens. Researchers observed a uniform distribution of the material on plant surfaces and stable adhesion under simulated wind conditions. The “micro-pricking” effect of the nanotubes is believed to enhance nutrient uptake.

Rudmin emphasized the broader implications of the research: “Traditional fertilizers are often inefficient due to rapid leaching and low nutrient uptake. Nanofertilizers offer a targeted, controlled-release alternative that could improve crop yields and reduce environmental losses.”

Further studies are underway to evaluate the nanofertilizer’s effectiveness under field conditions, including trials on barley crops. Researchers are also examining the long-term effects and potential phytotoxicity at increased concentrations of the active substances.

The research team included specialists from TPU’s School of Engineering and New Manufacturing Technologies and the Guangdong University of Technology in China.