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water 2004 nitrogen 819 Toxicity 529 soil moisture 427 environment 405 lead 395 heavy metals 352 Phosphorus 331 pollution 312 CO2 292 Nutrients 289 wheat 265 rice 248 Nitrate 238 pesticides 236 grassland 235 crops 224 copper 223 irrigation 221 Iron 210 Cadmium 198 emissions 187 Arsenic 175 precipitation 170 sodium 161 winter 158 |
Enzymes 148 Petroleum 144 summer 138 salt 132 corn 125 Calcium 120 soil microbes 109 Potassium 107 Chloride 102 drought 93 Mercury 88 Atrazine 83 chromium 71 tomato 67 DDT 47 Invertase 46 carbon storage 41 Glyphosate 38 Chlorpyrifos 30 Lindane 25 Endosulfan 25 apple 25 Zinc 25 Metolachlor 24 Glucose 24 |