Interactions between arsenic and nitrogen regulate nitrogen availability and arsenic mobility in flooded paddy soils.

In paddy soils, arsenic (As) stress influences nitrogen (N) transformation while application of N fertilizers during rice cropping affects As transformation. However, specific interactive effects between As and N in flooded paddy soils on As mobility and N availability were unclear. Here, we examined N and As dynamics in flooded paddy soils treated with four As levels (0, 30, 80 and 150 mg kg) and three urea additions (0, 4 and 8 mmol N kg).

Changes in soil Cd contents and microbial communities following Cd-containing straw return.

Contamination of soil with cadmium (Cd) threatens food safety and human health. In general, crop straws from contaminated soils could accumulate considerable amounts of Cd. The addition of Cd-containing rice straw can have negative effects on soil environment.