maximum potential nitrate discharge risk (landing method)

With the maximum potential risk of nitrate discharge, the maximum risk of nitrate leaching from the root space of vegetation is assessed by leaching soil water. The place of assessment is the lower limit of the rooted soil layer. The quotient of leachate rate and usable field capacity in the effective root space (nFCs) initially provides the exchange frequency of the plant-available soil water. This is classified in 5 levels (very low — very high) and results in the PNAG. The characteristic value of the potential nitrate discharge hazard is not suitable for deriving quantitative statements, since usage-dependent influences (including crop type, nitrogen quantities added and discharged, autumn nitrate content in soil) are not taken into account. The landing method for the calculation of the potential nitrate discharge hazard represents a modification of the bundle method in which the particular hazard to groundwater sites and bog sites is taken into account. Further information can be found here: The potential risk of nitrate discharge is assessed by leaching nitrate from the root space of the vegetation by leaching soil water. The place of assessment is the lower limit of the rooted soil layer. The quotient of leachate rate and usable field capacity in the effective root space (nFCs) initially provides the exchange frequency of the plant-available soil water. This is classified in 5 levels (very low — very high) and results in the PNAG. The characteristic value of the potential nitrate discharge hazard is not suitable for deriving quantitative statements, since usage-dependent influences (including crop type, nitrogen quantities added and discharged, autumn nitrate content in soil) are not taken into account. The landing method for the calculation of the potential nitrate discharge hazard represents a modification of the bundle method in which the particular hazard to groundwater sites and bog sites is taken into account. Further information can be found here: https://geo.brandenburg.de/karten/htdocs/21042020_Sickerwasserrate.pdf针对硝酸盐排放的最大潜在风险，本方法通过土壤水淋溶过程，评估植被根区硝酸盐淋失的最大风险。评估位点设定在根系土层的下限处。有效根区的渗滤液速率与田间持水量可用值（nFCs）的比值，初始表征了植物有效土壤水的交换频率。该交换频率被划分为5个等级（极低—极高），由此得到潜在硝酸盐排放风险指数（PNAG）。由于未考虑使用相关影响因素（包括作物类型、投入与排放的氮素量、土壤秋季硝酸盐含量），该潜在硝酸盐排放危害特征值不适用于推导定量结论。用于潜在硝酸盐排放危害计算的Landing法，是对Bundle法的改进版本，该改进纳入了针对地下水点位与沼泽点位的特定危害考量。 更多信息可参阅以下链接： 针对硝酸盐排放的最大潜在风险，本方法通过土壤水淋溶过程，评估植被根区硝酸盐淋失的最大风险。评估位点设定在根系土层的下限处。有效根区的渗滤液速率与田间持水量可用值（nFCs）的比值，初始表征了植物有效土壤水的交换频率。该交换频率被划分为5个等级（极低—极高），由此得到潜在硝酸盐排放风险指数（PNAG）。由于未考虑使用相关影响因素（包括作物类型、投入与排放的氮素量、土壤秋季硝酸盐含量），该潜在硝酸盐排放危害特征值不适用于推导定量结论。用于潜在硝酸盐排放危害计算的Landing法，是对Bundle法的改进版本，该改进纳入了针对地下水点位与沼泽点位的特定危害考量。 更多信息可参阅以下链接：https://geo.brandenburg.de/karten/htdocs/21042020_Sickerwasserrate.pdf