Sustained grain cadmium reduction in rice-wheat rotation: A cost-effective CaCO
Tang ZX, Dong G, Xu ZR, Tang Z, Zhao FJ
Soil Health
Limestone — the same material gardeners use to sweeten acidic soil — turns out to be a powerful, affordable tool for locking toxic heavy metals away from the food plants grow into.
Cadmium is a toxic metal that seeps into farmland from pollution and can build up in rice and wheat at levels unsafe to eat. Scientists tested 15 different ways to treat contaminated soil over three years and found that adding agricultural limestone was the cheapest and most consistently effective approach. The limestone works by chemically binding the cadmium in the soil so plants can't absorb it into their grains.
Key Findings
Agricultural limestone (CaCO₃) was the most cost-effective amendment across all three years of the trial, sustaining cadmium reduction in both rice and wheat grain.
The study evaluated 15 different amendment strategies in a continuous field trial, providing rare long-term multi-season efficacy data for cadmium remediation.
Cadmium contamination in both rice and wheat frequently exceeded regulatory safety limits in the untreated Yangtze River basin test site, highlighting the scale of the food safety risk.
chevron_right Technical Summary
A three-year field trial in China tested 15 soil amendment strategies to reduce toxic cadmium levels in rice and wheat grain. Calcium carbonate (agricultural limestone) proved the most cost-effective long-term solution for keeping cadmium below food safety limits across multiple growing seasons.
Abstract Preview
Cadmium (Cd) contamination of agricultural soils poses a serious threat to global food safety, especially in intensive rice-wheat rotation systems where both staple grains frequently exceed regulat...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Was this useful?
Chloroplast Genome Editing Eliminates Gluten Immunogenicity in Triticum aestivum
It could mean that people with celiac disease — roughly 1 in 100 worldwide — may one day safely eat bread made from real wheat, without sacrificing the taste...
Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species Oryza sativa —or, much less commonly, Oryza glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 y...