Environmental hazards of nitrogen loading in wetland rice fields

abonos abonos nitrogenados ammonia ammoniac ammonium sulphate arroz azote carp carpa carpe catla catla engrais environmental impact escorrentia fertilizers fish culture fish farming fitoplancton groundwater pollution impact sur l'environnement impacto ambiental leaching lessivage du sol losses nitrate nitrates nitratos nitrogen nitrogen fertilizers oryza sativa paddy soil perte phytoplancton phytoplankton piscicultura pisciculture pollution pollution de l'eau souterraine rice riz ruissellement runoff soil types sulfate d'ammonium sulfato de amonio tipos de suelos type de sol urea uree volatilisation volatilization