*3.3.2 Spatial variability*

To assess the spatial variability and their distribution, ammonium deposition fluxes were analyzed by sampling site, finding a mean value of 4.29 Kg Ha<sup>−</sup><sup>1</sup> year<sup>−</sup><sup>1</sup> , with the highest value registered in site X (Loma Blanca at SW) (**Figure 9**). However, applying Friedman test, it was concluded that there were not significant differences between sampling sites. It suggests that the differences found could be attributed only to sampling season as a result of agricultural activities and the effect of atmospheric dilution.
