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- Fertilizers
- Crops 4
- Environmental aspects 4
- Nutrient pollution of water 4
- Nutrition 4
- Plant nutrients 4
- Agricultural pollution 2
- Agriculture and energy 2
- Agriculture and state 2
- Biomass energy 2
- Economic conditions 2
- Energy crops 2
- Eutrophication 2
- Fertilizer industry 2
- History 2
- Hypoxia (Water) 2
- Industries 2
- Marine eutrophication 2
- Nonpoint source pollution 2
- Phosphate industry 2
- Phosphates 2
- Plant-soil relationships 2
- Pollution 2
- Soil fertility 2
- Sugar beet 2
- Water 2
- Water conservation 2
- Water requirements 2
- Watershed management 2
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