. In average, the six
cultivars had the same A values in both systems in each year. When
each system was analyzed separately, the cultivars tested showed
differences in the conventional system only in 2011, with Regent
having the highest value (Table 3). Net assimilation is strongly
influenced by availability of carbon dioxide: therefore, intercellular CO2concentration (Ci) was investigated. For this parameter, the
effects of year and system showed a great influence on intercellular CO2(Table 4). The average Ci (mol mol−1
) was found higher
in the organic system than in the conventional system in both
years (246.42 vs. 222.71 in 2010 and 227.79 vs. 206.97 in 2011)
and considering the average of both years it was 10.3% higher in
the organic cropping system