3.6 | Fertilisation effect
Our second objective was to assess the effect of fertilisation on GPP. Using the annual sums, neither GPPiso/SF nor GPPPRELES was significantly different between the F and the R plots (Figure 6). However, there were consistent trends; GPPiso/SF was higher by 10% in the F plot than in the R plot and GPPPRELES was higher by 16% (Figure 6). Using the daily data corrected for autocorrelation, we found a significant increase in the F plot; GPPiso/SF was higher by 8% and GPPPRELES was higher by 16% (Figure 7, Table 2 and see Figure S5 for others assumptions).