It deposited a cottage-size mound of grayish-blue sand—190 metric tons of a crushed volcanic rock called basalt. Farmers spread the pulverized basalt across several fields that they sowed with ...

The four-year field trial in the U.S. Corn Belt, led by researchers at the University of Sheffield's Leverhulme Center for Climate Change Mitigation, shows adding crushed basalt to farmland in a ...