Related by context. Frequent words. (Click for all words.) 71 chemical fertilizers 61 herbicides 60 fertilizers pesticides 59 pesticides 58 pesticides herbicides 57 fertilizers 57 nitrogen fertilizers 54 nitrogen fertilizer 53 Organic farming 53 fertilizer 51 organic fertilizers 51 insecticides 51 biofuel crops 51 crop residue 51 organic farming 50 herbicide 50 biotech crops 49 weed killers 49 fungicides 49 genetically engineered crops 49 fossil fuels 48 crops 48 organic fertilizer 47 soil fertility 47 genetically modified crops 47 pesticide 47 alfalfa 46 weed killer 46 genetically modified seeds 46 nitrogen 46 manure 46 Atrazine 46 preservatives 46 organic 46 compost 46 glyphosate 45 environmentally harmful 45 tillage 45 crop yields 45 corn stover 45 GMOs 45 cropland 45 fertilizing 44 corn ethanol 44 tilling 44 GMO crops 44 atrazine 44 chemical additives 44 beneficial insects 43 mulches 43 sugar beets 43 landfilling 43 compost piles 43 agrochemicals 43 insecticide 43 environmentally benign 43 methyl bromide 43 biocide 43 chicken manure 43 genetically modified corn 43 irrigated 43 genetically modified organisms 43 Bt cotton 43 corn stalks 43 organically grown 43 solvents 43 cheatgrass 43 drip irrigation 43 weed seeds 42 fumigant 42 corn 42 bio fuels 42 biofuels 42 fossil fuel 42 insect resistant 42 alfalfa hay 42 compost pile 42 sewage sludge 42 fungicide 42 woody plants 42 antibiotics 42 biodegradable plastics 42 soil compaction 42 composted 42 genetic manipulation 42 biochar 42 agrochemical 42 chemicals 42 hemp 41 antimicrobials 41 genetically modified 41 ornamental plants 41 croplands 41 composts 41 organic gardening 41 Fertilizer 41 genetic modification 41 soils 41 prairie grasses 41 Pesticides 41 organic solvents