Effects of Organic Fertilizers on Cd Activity in Soil and Cd Accumulation in Rice in Three Paddy Soils from Guizhou Province.

Bull Environ Contam Toxicol

College of Resource and Environmental Engineering, Guizhou University, Guiyang, 550025, China.

Published: December 2021

A greenhouse pot experiment was conducted to investigate the effects of organic fertilizer application on Cd activity in soil and Cd accumulation in rice in paddy soils with different levels of contamination from varying Cd sources in Guizhou Province (the soil types are NJ, which is a soil with a high geological background of Cd; and QX and JZ, which are anthropogenic Cd-polluted soils). The application of organic fertilizer increased the content of organic matter in the soil and reduced the concentration of acetic acid-extractable Cd in QX and JZ paddy soils. Organic fertilizer increased rice yields and significantly decreased the Cd concentration in brown rice. In the QX and JZ soils, however, the concentration of Cd in brown rice exceeded the allowable maximum levels (MLs) of Cd in China. In contrast, the concentration of Cd in brown rice in NJ soil met the MLs of Cd. Additionally, the average daily dose and the health risk index of Cd in NJ soil were much lower than those in QX and JZ soils. The results indicate that organic fertilizer application is a promising and economic means to control Cd pollution in paddy soil. Moreover, risk assessment shows that the risk of exposure to Cd in the high geological background soil (NJ) was much lower than that in anthropogenically polluted soils (QX and JZ).

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http://dx.doi.org/10.1007/s00128-021-03326-0DOI Listing

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