Results are reported as median values, with minimum and
maximum values. The reasons for this are manifold: most underlying
biophysical processes leading to agricultural performances
and environmental impacts are not linear; the calculations leading
to the assessment of direct field emissions and environmental
impacts are not of a linear nature either as a result of threshold
effects due to discrete scaling factors related to crop and water
management practices; and consequently, the results do not follow
normal distributions (e.g. in Figs. 4 and 5).