Eutrophication of inland waters with special reference to the influence of agricultural practices, including the use of fertilizers

abonos aguas interiores azote cours d'eau cultural methods cursos de agua eaux continentales engrais farmland fertilizers fosfatos (sales) inland waters lac lagos lakes leaching lessivage du sol mode de culture nitrogen nutrientes nutrients phosphate (sel) phosphates (salts) rivers substance nutritive terre agricole