Management principles for waters protection against pollution by nitrates

The methodology summarizes the codes of good agricultural practices for protection of waters against pollution caused by nitrates from agricultural sources. The requirements contributing to reduction of nitrogen losses as exclusion of nitrogen fertilization during unsuitable periods, on flooded, frozen or snow covered soils are concisely described. Further, the recommendations for management of sloping fields, in proximity of surface waters and the principles of fertilizer use respecting soil-climate conditions, nitrogen demand by crops and soil nutritional status are given. Explanation of basic technical terms and references of relevant publications and legislative norms are supplied