Table 2: Aboveground vegetal biomass (kg ha−1) in the different crops over the period 1999–2003.

Treatment1999/20002000/20012001/20022002/2003 Total accumulated1
WheatFallowBarleyVetch

Chemical 9313 a014201 a3032 a17233 a
Organic 9988 a010419 b2406 b12825 b
No fertilization10073 a012668 ab2098 b14766 b

Average 9792012429251214941

In italic the crop sequence considered in this study (1also for total accumulated data). Different small letters in the same column indicate significant differences at .