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soil 755 water 250 pollution 87 heavy metals 77 lead 72 nitrogen 57 Phosphorus 51 environment 47 Nutrients 43 irrigation 38 pesticides 35 Arsenic 28 tropical 27 Mercury 26 crops 26 Zinc 24 agriculture 24 Iron 24 copper 24 wheat 23 Cadmium 21 Toxicity 21 emissions 20 rice 20 winter 19 landfill 18 |
summer 17 grassland 16 soil moisture 14 Nitrate 14 precipitation 13 barley 13 Minerals 12 Atrazine 12 nickel 12 radiation 11 acidification 11 Metribuzin 11 Citrus 11 climate change 11 calcium carbonate 11 livestock 10 cancer 10 herbicides 10 Uranium 10 blood 9 DDT 9 drought 9 carbon sequestration 9 Endosulfan 9 oak 9 |