Researchers issue warning on major problem affecting food supply: 'We need to figure out a way to fix it'

Rice is a staple food for more than half of the world's population, but the way it’s traditionally farmed is causing serious environmental damage. Conventional rice farming relies heavily on fertilizers that often wash away into nearby rivers and lakes, contaminating water sources. This practice also releases large amounts of methane and other greenhouse gases, which contribute to global warming. Given these challenges, scientists have been searching for ways to make rice cultivation more sustainable without sacrificing yield. A recent breakthrough might just be the game-changer farmers and environmentalists have been waiting for. Researchers from the University of Massachusetts Amherst and Jiangnan University in China have found that applying tiny, nanoscale amounts of selenium—a nutrient essential for both plants and humans—can help rice plants grow stronger and more nutritious while using far less fertilizer. Their findings, published in the Proceedings of the National Academy of Sciences, reveal that this approach not only boosts crop yield but also reduces pollution, all while improving soil health. The team’s field experiments involved spraying minute quantities of selenium directly onto rice leaves and stems using drones, which increased the plants’ photosynthesis rates by over 40%. This enhanced photosynthesis allowed the rice plants to absorb more carbon dioxide and develop healthier, deeper roots. These roots fostered beneficial microbes in the soil that helped the plants fix nitrogen more efficiently, which meant less fertilizer was needed—about a third less than usual. This method had multiple positive outcomes: the rice produced contained higher levels of protein and vital amino acids, the crops emitted up to 45% less pollution, and farmers earned nearly 40% more profit per ton of rice compared to traditional methods. Considering that rice farming consumes about 20% of the world's nitrogen fertilizer—which often ends up polluting waterways—the potential environmental benefits of this new technique are huge. The researchers emphasized the need to revitalize agricultural productivity, pointing out that the Green Revolution's gains are plateauing. As Baoshan Xing, a professor at UMass Amherst and co-senior author of the study, noted, "The Green Revolution massively boosted agricultural output during the middle of the last century, but that revolution is running out of steam. We need to figure out a way to fix it and make it work." If this selenium application method can be scaled up globally, it could help reduce fertilizer pollution and boost food security by making rice farming more nutrient-efficient. This would be a big step toward feeding the planet's growing population while lessening the environmental footprint of one of its most important crops.