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farmland --- farmland --- Fertilizer application --- Fertilizer application --- nitrogen fertilizers --- nitrogen fertilizers --- Nitrates --- Nitrates --- Leaching --- Leaching --- Pollution --- Pollution --- Regulations --- Regulations --- European Union --- European Union --- Wallonie --- Wallonie

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Grazing --- Grazing --- Permanent pastures --- Permanent pastures --- Dairy cattle --- Dairy cattle --- Fertilizer application --- Fertilizer application --- Nitrogen --- Nitrogen --- Livestock management --- Livestock management --- Environmental impact --- Environmental impact --- Sustainable development --- Sustainable development --- evaluation. --- evaluation --- methodology --- methodology --- classification. --- classification --- Farm management --- Farm management --- Management by objectives --- Management by objectives --- Nitrates --- Nitrates --- Nitrites --- Nitrites --- Water pollution --- Water pollution --- Economic analysis --- Economic analysis --- Wallonie --- Wallonie

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Proefschriften --- Thèses --- Lactuca sativa --- Plante de serre --- Greenhouse crops --- Engrais azoté --- nitrogen fertilizers --- Cycle de l'azote --- nitrogen cycle --- Résidu --- residues --- Nitrate --- Nitrates --- Tissu végétal --- Plant tissues --- Récolte --- Harvesting --- 635.52 --- 581.133.1 --- 641.12 --- 631.544.4 --- 631.416.1 --- Lettuce. Lactuca sativa. Butterhead, cos and crisp lettuce --- Assimilation of nitrogen --- Proteins. Nitrogenous foodstuffs. Meat, eggs, nuts, vegetables etc. --- Greenhouse (glasshouse) cultivation. Phytotron --- Nitrogen --- Theses --- 631.416.1 Nitrogen --- 631.544.4 Greenhouse (glasshouse) cultivation. Phytotron --- 641.12 Proteins. Nitrogenous foodstuffs. Meat, eggs, nuts, vegetables etc. --- 581.133.1 Assimilation of nitrogen --- 635.52 Lettuce. Lactuca sativa. Butterhead, cos and crisp lettuce