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soil 2621 water 1055 nitrogen 325 drought 218 precipitation 205 summer 186 environment 167 winter 148 CO2 144 irrigation 143 emissions 128 grassland 127 tropical 127 wheat 113 climate change 102 Nutrients 99 lead 88 Nitrate 75 radiation 70 Phosphorus 69 Seeds 67 crops 56 rice 55 Toxicity 53 weather 49 landfill 49 |
pollution 47 Carbon dioxide 46 ozone 44 corn 43 agriculture 40 salt 39 Soybean 39 oak 38 Nitrous oxide 37 Chlorophyll 36 eggs 34 pesticides 32 Potassium 32 Egg 25 herbicides 23 Atrazine 19 alfalfa 18 copper 18 N2O emissions 17 apple 17 willow 12 Dehydration 12 biodiversity 12 Isoproturon 12 Zinc 11 |