Mercury in rice (Oryza sativa L.) and rice-paddy soils under long-term fertilizer and organic amendment

Chemical fertilizers combining with returning rice straw (NPK1 + S) led to highest MeHg concentration in grain and soil; while the nitrogen and potassium (NK) treatment led to significantly higher THg in grain. Concentrations of soil MeHg were significantly correlated with THg in soil and MeHg in grain. Phosphorus fertilizer was a main source contributing to soil THg, while returning rice straw to the field contributed significantly to MeHg in soil and rice grain.117