Information

Level 4 Data Summaries

Key findings

For flume 1, there were 20 samples analysed with a median TSS concentration of 37.32 mg/L. Flume 2 had 33 samples analysed producing a median TSS concentration of 71 mg/lL Apart from the first sampling, mean, NOx concentrations were always higher in the high N treatment (Flume 2) than in the low N treatment (flume 1). Individual NOx concentrations were as high as 7.5 mg N/L for the low N plot and 15.8 mg N/L for the high N plot.

The main difference between the two flumes is that the sub-surface pathway dominates the TN losses for the high fertiliser site (Flume 1, 58%), and surface water dominates the lower fertiliser application site (Flume 2, 61%). Overall there is approximately 44% more nitrogen being lost to water from Flume 2 than Flume 1.

This study only recorded a low number of samples for the two flumes over the study period; as such, the conclusions drawn from the study are not robust and statistically defensible.

Key tables and figures extracted from data, literature and miscellaneous publications

Various clippings

 

Level 1, level 2, level 3 and level 5