The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters

This article shows the results of analyses conducted of the seasonal variability of nitrogen concentrations and loads, depending on plants growing season, this doesn’t seem to work, consider changing to something like ‘dependent upon the stage of the plant growing season,’ if that is what you mean as well as river flow and the precipitation levels in the basins of Middle Warta, Reda and Rega. The Macromodel DNS/SWAT, implemented for three basins, has been calibrated in calculations profiles of three river basins this is vague and unclear, the repetition of ‘three (river) basins’ is particularly confusing. The analysis confirmed the significant impact of cover crops on the retention of water and nutrients. The phenomenon of periodic decreases and stabilisation of nitrogen concentrations and loads in the surface waters flowing through the profiles of the enclosing water body was observed and analysed. The flattening phenomenon analysis of the phenomenon to me, the repetition of ‘phenomenon’ is confusing, you could clarify this by defining the second use of ‘phenomenon’ by, for example, inserting ‘of these decreases and stabilisation’ here can be used to assess the state of the ecosystem in the basin area.