Ecological safely evaluation of Cr in soils based on the soil-seed system in Henan, China

Cr safety limits in different soil types were obtained by using the method and principle of agro-geological geochemical evaluation and measured data of Cr in the soil-wheat system in the Henan Huanghuai plain, Henan. Then the “practical critical values” were used to revise the safely limits and establish the evaluation standard value. Finally, the evaluation standard value was used to conduct the Cr ecological safety evaluation of soils in Henan.