‘Black Soils’ – Excessive use of arsenic, cadmium, lead and mercury

ROME: Soils are polluted due mostly to human activities that leave excess chemicals in soils used to grow food, the United Nations reports.

Excess nitrogen and trace metals such as arsenic, cadmium, lead and mercury can impair plant metabolism and cut crop productivity, ultimately putting pressure on arable land, the UN Food and Agriculture Organisation ( FAO) on 23 June informed.

“When they enter the food chain, such pollutants also pose risks to food security, water resources, rural livelihoods and human health.“

The issue took centre stage at the Fifth Plenary Assembly ( PA) of the Global Soil Partnership (GSP) held at FAO headquarters in Rome this week.

“Soil pollution is an emerging problem, but, because it comes in so many forms, the only way we can reduce knowledge gaps and promote sustainable soil management is to intensify global collaboration and build reliable scientific evidence,” said Ronald Vargas, a FAO soils officer and Secretary of the GSP.

“Combating soil pollution and pursuing sustainable soil management is essential for addressing climate change,” said for his part Rattan Lal, President of the International Union of Soil Sciences, in his keynote address to the Plenary Assembly.

Tackling human- caused problems through sustainable practices will mean “more change will happen between now and 2050 than during the 12 millennia since the onset of agriculture,” he added.

The GSP Plenary Assembly is a unique, neutral and multistakeholder platform to discuss global soil issues, to learn from good practices, and to deliberate on actions to secure healthy soils for an effective provision of ecosystem services and food for all,” said Maria Helena Semedo, FAO Deputy DirectorGeneral, Climate and Natural Resources.

“Action at the country level is the new frontier.”

The Plenary Assembly endorsed three new initiatives aimed at facilitating information exchange: The Global Soil Information System; the Global Network of Soil Laboratories, set up to coordinate and standardise measurement across countries; and the International Network of Black Soils, launched to increase knowledge about the world’s most fertile agricultural soils, which are also known for their high carbon content.