Carcinogenic risk 1 Ecological risks 1 Factorization 1 Farmland soils Farms 1 Health 1 Health risks 1 Human health risks 1 Positive Matrix Factorization 1 Potential ecological risk 1 Potentially toxic elements 1 Priority source 1 Risk assessment 1 Risk evaluation 1 Soil pollution 1 Soils 1 Source apportionment 1 farmland soil 1 potentially toxic element 1 priority sources 1 risk evaluation 1 source apportionment 1