Wollastonite powder application increases rice yield and CO2 sequestration in a paddy field in Northeast China

Enhanced silicate rock weathering (ERW) on cropland soils can increase crop yield and promote carbon dioxide (CO2) sequestration. Applying silicate rock powder to flooded rice paddies can promote weathering, but the effects of ERW on rice production and CO2 removal rates in the field remain unclear. We investigated the effects of adding wollastonite (CaSiO3) powder (5 t ha−1) to rice paddy plots on soil properties, rice yield, rice grain quality, grain arsenic, grain cadmium, and soil CO2 sequestration in Liaoning Province, Northeast China. Wollastonite application increased soil pH, soil available silicon (Si) content, and Si uptake by rice. Wollastonite application increased grain number by 10