## 3 Results and Discussions
Obviously, greenhouse crops have higher values of the coefficient because most of the plastic material used refers to the greenhouse or tunnel cover (values around 92% for some crops and 60% for others). Moreover, by applying the coefficients implemented to the total areas cultivated with the crops under examination in a tabular way for the whole of Italy, it emerges that most of the tons produced every year are derived from the watermelon open air, with almost 40% of the total followed by the melons in greenhouses, with 13.35% (Table 5). Some, instead, have extremely low values. From the spatial join between the previously elaborated data and the administrative boundaries, it was possible to spatialize within the Italian provinces the quantities of the different types of plastics. Considering the size of the elaborated database, Figure 3 shows an example of mapping for one of the most cultivated crops among those considered in the study (as shown in Table 4) and for which the greatest amount of plastic is used (as shown in Table 5), i.e., watermelon in open air. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**APCoeff\_film**} & \multicolumn{2}{c}{**APCoeff\_much**} & \multicolumn{2}{c}{**APCoeff\_irr**} & \multicolumn{2}{c}{**APCoeff\_tunnel**} & \multicolumn{2}{c}{**APCoeff\_tot**} \\ \hline
**Crops** & **kg\(\cdot\)m\({}^{-2}\)-years\({}^{-1}\)** & \%** & **kg\(\cdot\)m\({}^{-2}\)-years\({}^{-1}\)** & \%** & **kg\(\cdot\)m\({}^{-2}\)-years\({}^{-1}\)** & \%** & **kg\(\cdot\)m\({}^{-2}\)-years\({}^{-1}\)** & \%** & **kg\(\cdot\)m\({}^{-2}\)-years\({}^{-1}\)** \\ \hline CCG & 0.150 & 91.24 & 0.010 & 6.09 & 0.004 & 2.68 & & 0.164 \\ FBG & 0.150 & 91.24 & 0.010 & 6.09 & 0.004 & 2.68 & & 0.164 \\ LG & 0.150 & 91.24 & 0.010 & 6.09 & 0.004 & 2.68 & & 0.164 \\ MG & 0.150 & 59.06 & 0.008 & 3.07 & 0.003 & 1.26 & 0.093 & 36.61 & 0.254 \\ WG & 0.150 & 59.06 & 0.008 & 3.07 & 0.003 & 1.26 & 0.093 & 36.61 & 0.254 \\ FG & 0.150 & 91.24 & 0.010 & 6.09 & 0.004 & 2.68 & & 0.164 \\ SG & 0.150 & 91.24 & 0.010 & 6.09 & 0.004 & 2.68 & & 0.164 \\ POA & & & 0.026 & 76.47 & 0.008 & 23.53 & & 0.034 \\ AOA & & & & & 0.013 & 100.00 & & 0.013 \\ ROA & & & & & 0.016 & 100.00 & & 0.016 \\ COA & & & & & 0.016 & 100.00 & & 0.016 \\ EPOA & & & & & 0.008 & 100.00 & & 0.008 \\ BPOA & & & & & 0.008 & 100.00 & & 0.008 \\ BRAO & & & & & 0.008 & 100.00 & & 0.008 \\ LOA & & & & & 0.016 & 100.00 & & 0.016 \\ ZOA & & & 0.023 & 74.52 & 0.008 & 25.48 & & 0.031 \\ SCOA & & & & 0.016 & 100.00 & & 0.016 \\ WOA & 0.180 & 92.01 & 0.013 & 6.64 & 0.003 & 1.35 & & 0.196 \\ POA & & & & & 0.016 & 100.00 & & 0.016 \\ EOA & & & & & 0.016 & 100.00 & & 0.016 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: The different APCCoeffs calculated for every single crop. Values are expressed in kg\(\cdot\)m\({}^{-2}\).years\({}^{-1}\). Furthermore, each coefficient is expressed as a percentage of the total (APCoeff_tot). Where there are no values, it means that, for that crop, the respondents did not use that type of product. In Appendix A—Table A1. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Crop** & **Tons\(\cdot\)years\({}^{-1}\)** & \%** & **Crop** & **Tons\(\cdot\)years\({}^{-1}\)** & \%** \\ \hline CCG & 1003.07 & 1.84 & COA & 32.47 & 0.06 \\ FBG & 1142.76 & 2.09 & EPOA & 122.20 & 0.22 \\ LG & 5497.90 & 10.08 & BPOA & 149.83 & 0.27 \\ MG & 7284.42 & 13.35 & BKOA & 55.61 & 0.10 \\ WG & 6093.41 & 11.17 & LOA & 2455.04 & 4.50 \\ FG & 156.04 & 0.29 & ZOA & 1321.49 & 2.42 \\ SG & 4265.26 & 7.82 & SCOA & 20.52 & 0.04 \\ POA & 12.40 & 0.02 & WOA & 21,622.13 & 39.62 \\ AOA & 163.64 & 0.30 & FOA & 3085.12 & 5.65 \\ ROA & 43.78 & 0.08 & EOA & 42.13 & 0.08 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Total tons per year of plastic produced in Italy for each type of crop examined. The values are also expressed as percentages of the totals.