Prediction of arsenic accumulation in a calcareous soil-wheat/maize rotation system with continuous amendment of sewage sludge

A potted experiment was conducted to explore the accumulation of arsenic (As) and predict uptake As by a wheat-maize rotation system in calcareous soil with different rates sewage sludge (SS) amendment over two consecutive years. The SS decreased pH value but increased cation exchange capacity (CEC), calcium carbonate (CC), organic carbon (OC) crops increasing addition. bioconcentration factor (BCF) wheat maize had significant negative correlation pH, CC positive OC. Soil CEC only BCF wheat. Regression analysis showed that As, OC, were good predictors concentration wheat/maize. regression model for each part wheat/maize plants high efficiency explained 67~88% variability. R2 values grain prediction models 79% 76%, respectively. Thus, these contribute study risk assessment utilisation soil-wheat/maize systems.