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Environmental aspects Agriculture 1 Aspect de l'environnement 1 Aspect économique 1 Colonisation intérieure 1 Economic aspects 1 Fertilité 1 more ... Government policy 1 Histoire 1 History 1 Land settlement 1 Pesticide Residues 1 Pesticides 1 Politique gouvernementale 1 Public Policy 1 Résidus 1 Soil conservation 1 Soil fertility 1 Sols 1 economics 1 less ...

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