The effects of organic and conventional cultivation methods on dry matter, protein, minerals, and total phenolic content has been studied for two successive years in two landraces and one commercial hybrid of eggplant. In the first year, organically produced eggplants had higher mean contents (expressed on a fresh weight basis) of K (196 vs 171 mg 100 g-1), Ca (11.1 vs 8.7 mg 100 g-1), Mg (6.0 vs 4.6 mg 100 g-1), and total phenolics (49.8 vs 38.2 mg 100 g-1) than conventionally grown eggplants. In the second year, in which matched plots having a history of organic management were cultivated following organic or conventional fertilization practices, organically produced eggplants still had higher contents of K (272 vs 249 mg 100 g-1) and Mg (8.8 vs 7.6), as well as of Cu (0.079 vs 0.065 mg 100 g-1), than conventionally fertilized eggplants. Conventionally cultivated eggplants had a higher polyphenol oxidase activity than organically cultivated ones (3.19 vs 2.17 enzyme activity units), although no differences in browning were observed. (D. Raigón, Rodríguez-Burrezo and Prohens, 2010)!
Acording to D. Raigon, Rodríguez-Burrezo and Prohens, this graphic shows that there's more protein in conventional cultivation(0.93g) than organic cultivation(0.89) with a p value of 0.332. Unfortunately, this graphic doesn't have a lot of information, so we can't verify if the information is true because we can't do the T of student.
We also have that the sodium(Na) of organic cultivation(25.9g) is higher than the conventional cultivation(25.6g) with a p value of 0.817, the potassium is higher in organic cultivation(0.196g) than the conventional cultivation(0.171 g) and the same thing happens with match(19.4g > 19g), with calcium(0.111g > 0.087g), with magnesium(0.006g > 0.0046g)and with iron(0.134g > 0.103g). Curiously, the copper have the same value in both cases(0.044g) and only the zinc have a higher value in conventional cultivation(0.147g) than organic cultivation(0.125g).
We can see that only the potassium, the calcium and the magnesium, their p value is lower than 0.05.