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Nitrification --- -Nitrogen --- -Nitrogen-fixing plants --- -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 --- Plants, Effect of nitrogen on --- Nitrogen --- Plants --- Plants and soil --- Soil-plant relationships --- Soils and plants --- Plant ecology --- Plants, Nitrogen-fixing --- Biofertilizers --- Group 15 elements --- Nonmetals --- Oxidation --- Denitrification --- Nitrifying bacteria --- Congresses --- Fixation --- -Congresses --- Nitrogen content --- Physiological effect --- Effect of chemicals on --- Nitrogen-fixing plants --- Plant-soil relationships --- Soils --- Earth (Soils) --- Flora --- Plant kingdom --- Plantae --- Vascular plants --- Vegetable kingdom --- Vegetation --- Wildlife --- Organisms --- Botany --- Effect of nitrogen on
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631.84 --- Nitrogen --- -Nitrogen fertilizers --- -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 --- Plants, Effect of nitrogen on --- Plants --- Plants and soil --- Soil-plant relationships --- Soils and plants --- Plant ecology --- Nitrogenous fertilizers --- Fertilizers --- Nitrogen in agriculture --- Group 15 elements --- Nonmetals --- Nitrogen fertilizers --- Environmental aspects --- -Congresses --- Congresses --- Nitrogen content --- Physiological effect --- Effect of chemicals on --- 631.84 Nitrogen fertilizers --- -631.84 Nitrogen fertilizers --- Earth (Soils) --- Soils --- Nitrogen content&delete&
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