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crops 551 soil 416 water 199 nitrogen 105 agriculture 68 wheat 66 farming 64 Nutrients 63 rice 57 Toxicity 57 irrigation 55 environment 54 Phosphorus 52 pesticides 51 corn 45 heavy metals 44 lead 41 Vegetables 41 emissions 40 Nitrate 37 pollution 30 Digestion 29 herbicides 28 Sugar 28 biogas 28 Brassica 28 |
organic farming 27 tropical 27 Insecticide 26 winter 25 tomato 25 Enzymes 25 Soybean 23 Seeds 23 rye 23 Zinc 23 genetically modified 22 ethanol 22 Toxins 22 Arsenic 21 lettuce 21 Selenium 21 blood 21 carrots 20 Aluminum 20 recycling 20 copper 20 livestock 19 spinach 19 Carrot 19 biofuels 18 |