Proportion (%) | Cr | Cd | Zn | Ni | Pb | As | Hg | Cu | F |
Rainfall and fallen dust | 80.76 | 85.76 | 67.55 | 22.66 | 22.86 | 66.44 | 67.04 | 57.22 | 31.19 |
Irrigation | 13.17 | 12.28 | 29.97 | 75.39 | 72.30 | 26.02 | 23.09 | 38.87 | 18.80 |
fertilization | 5.93 | 1.95 | 2.47 | 1.95 | 4.72 | 7.59 | 8.81 | 3.90 | 50.01 |
Pesticides | 0.15 | 0.003 | 0.001 | 0.006 | 0.003 | 0.015 | 0.010 | 0.011 | 0.02 |