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water 1739 nitrogen 405 soil 402 Phosphorus 281 freshwater 199 pollution 181 fish 173 phragmites 159 environment 152 summer 149 Mercury 136 Nitrate 135 Nutrients 135 tropical 128 Toxicity 123 lead 116 lakes 109 cod 109 winter 103 salt 102 Iron 96 emissions 91 precipitation 87 biodiversity 86 heavy metals 74 flooding 74 |
rice 71 agriculture 69 Sulfate 68 pesticides 65 methylmercury 64 irrigation 62 climate change 50 CO2 48 eggs 37 Cadmium 35 copper 34 Arsenic 33 drought 28 herbicides 28 organics 28 Manganese 28 crops 28 grassland 27 pharmaceuticals 27 Nitrous oxide 23 Selenium 21 chromium 18 Atrazine 18 MTBE 18 methane emissions 18 |