Table 9a reports the eco-efficiency of the three systems as per
impact category. Because market price (the market value at farm
gate) of paddy rice was identical in all three systems (12 THB per kg
in 2010), the results are basically reversed values of the results on
impact per kg of rice produced shown in Table 7b. However, there is
an interest in reporting eco-efficiency as such, as it represents how
cropping systems generate total value per environmental impact
unit they create. In that sense, Rw systems are more eco-efficient
than others, with the exception of AP, ODP and LU impacts, for
which Iw systems perform slightly better. Id systems lag significantly
behind the other two systems.