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Fertilizers --- Groundwater --- Soils --- Environmental aspects --- Congresses --- Pollution --- Nitrogen content --- 631.416.1 --- -Groundwater --- -Soils --- -Earth (Soils) --- Mold, Vegetable --- Mould, Vegetable --- Soil --- Vegetable mold --- Agricultural resources --- Plant growing media --- Regolith --- Land capability for agriculture --- Ground water --- Subterranean water --- Underground water --- Water, Underground --- Water --- Hydrogeology --- Artificial fertilizers --- Chemical fertilizers --- Crops --- Fertilisers --- Fertilization of soils --- Fertilizers and manures --- Field crops --- Agricultural chemicals --- Plants --- Soil amendments --- Soil fertility --- Nitrogen --- -Congresses --- -Environmental aspects --- Fertilization --- Nutrition --- -Nitrogen --- 631.416.1 Nitrogen --- -631.416.1 Nitrogen --- Earth (Soils) --- Environmental aspects&delete& --- Pollution&delete& --- Nitrogen content&delete& --- Report --- Fertilizers - Environmental aspects - Congresses --- Groundwater - Pollution - Congresses --- Soils - Nitrogen content - Environmental aspects - Congresses --- Engrais et amendements --- Fertilite --- Sols

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Prairie --- Prairies --- Écosystème --- ecosystems --- Composition botanique --- Botanical composition --- Azote --- Nitrogen --- Minéralisation --- Mineralization --- Biologie du sol --- Soil biology --- Écologie --- ecology --- 633.2 --- 631.416.1 --- 581.526.45 --- Forage grasses. Meadow and pasture grasses --- Prairie formations --- Theses --- 581.526.45 Prairie formations --- 631.416.1 Nitrogen --- 633.2 Forage grasses. Meadow and pasture grasses

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Oxyde nitreux --- Nitrous oxide --- Cycle de l'azote --- nitrogen cycle --- Dioxyde de carbone --- carbon dioxide --- Sol arable --- Arable soils --- Échange gazeux --- Gas exchange --- Pollution atmosphérique --- air pollution --- 631.416.1 --- 546.172.5 --- 631.814 --- Nitrogen --- Nitrous oxide N2O and its derivatives --- Loss of fertilizer principals. Change in manurial value --- Theses --- 631.814 Loss of fertilizer principals. Change in manurial value --- 631.416.1 Nitrogen --- Flandre

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631.416.1 --- Nitrification --- Nitrogen cycle --- Plant-soil relationships --- Plants, Effect of nitrogen on --- Soils --- -Earth (Soils) --- Mold, Vegetable --- Mould, Vegetable --- Soil --- Vegetable mold --- Agricultural resources --- Plant growing media --- Regolith --- Land capability for agriculture --- Nitrogen --- Plants --- Plants and soil --- Soil-plant relationships --- Soils and plants --- Plant ecology --- Biogeochemical cycles --- Oxidation --- Denitrification --- Nitrifying bacteria --- 631.416.1 Nitrogen --- Nitrogen content --- Physiological effect --- Effect of chemicals on --- -Plants, Effect of nitrogen on --- Earth (Soils) --- Nitrogen metabolism --- Effect of nitrogen on --- plant soil relations

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Cropping systems --- Crops and water --- Crops and nitrogen --- Cropping systems. --- Crops and water. --- Crops and nitrogen. --- 631.811.1 --- 631.811.91 --- 631.58 --- 631.432 --- 631.416.1 --- Nitrogen and crops --- Nitrogen --- Nitrogen in agriculture --- Agrohydrology --- Crop-water relationships --- Water and crops --- Water-crop relationships --- Plant-water relationships --- Water in agriculture --- Irrigation farming --- Agricultural systems --- Soil management --- Nitrogen. N --- Water --- Particular cultivation systems --- Groundwater. Agricultural hydrology --- Conferences - Meetings --- 631.416.1 Nitrogen --- 631.432 Groundwater. Agricultural hydrology --- 631.58 Particular cultivation systems --- 631.811.91 Water --- 631.811.1 Nitrogen. N