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Agricultual production and land, Catch crops, green manure, Ecophysiology of plants, Freshwater biology, Legislation (international, EU and national), Manure / fertilizer, Nitrogen, Nutrient flows, Organic farming, Phosphorus, Plant adaptation to the environment, Plant nutrients, Plant physiology, Plant physiology, Substance turnover, Sustainable technologies, Tropical ecosystems, Vegetables, Wastewater purification