Seasonal changes in phosphorus load flowing out of small agricultural catchments

摘要: In this article distribution of monthly phosphorus loads flowing out two agricultural catchments which are located in different physiographic conditions Lower Silesia was analysed. Loads runoff from the catchment piedmont part each month rarely exceed 0.10 kg P ∙ ha-1. The size annual load is determined by obtained months early spring. Much lower for lowland catchment, near Wroclaw. Values calculated value 0.01 Culmination bringing away a bit more extended time compared to on Sudety Mts. Foreland. higher observed during period January April – has major impact that flows whole hydrological year. results clearly indicate threat watercourses and water reservoirs supply compounds land periodic it particularly high Phosphorus analyzed very diverse. From facility Foothill year, research period, flowed average 0.81 Significantly values were second 0.15 ha-1 discharged year largely amount winter half (from XI IV). case foothill 0.56 ha-1, presents 69% percentage even slightly 73%.