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Iran --- Isfahan (Iran : Province) --- Description and travel --- Descriptions et voyages
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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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