Valutazione dell’evoluzione della fertilità chimica e biologica in aree pedoclimatiche rappresentative gestite con regime tradizionale e biologico.

none12The multidisciplinary research group of BIOGEA project on soil fertility is currying out a 3-year study comparing organic and conventional soil management performed in two sites in growing areas representative of two Italian environment: North east-Ravenna, lat. 44° 25′ 4′′ N and South-East - Foggia , lat. 41° 28′ 0′′ N. The study has been carried out on a 3- year rotation system under organic and conventional management having two final crops: sugar beet and processing tomato. The following parameters have been evaluated i) chemical analysis of total organic carbon (TOC), total extracted organic carbon (TEC) and humified fraction (HA+FA); ii) dynamic of fungal and bacterial communities; iii) dynamic of mineral nitrogen (Nmin) and total nitrogen (Ntot); iv) microbial biomass, mineralization rate etc., and other parameters of microbial activity. In some cases, as well as for parameters on the organic C and the humified fraction, to have some relevant information on variation induced by organic and conventional soil management it is necessary to wait for at list a 3-year period. For N, on the contrary, on basis of dynamics it is possible to affirm that in Ravenna site, 20 month after study beginning, Ntot level in samples from plots under organic management was significantly higher than that recorded in samples coming from conventional plots. The same trend was observed for Ntot in Foggia site, but in this case, the difference was not statistically significant. Twenty month after study beginning, only in Ravenna site fungal and bacterial communities in soil samples from organic plots rose a level significantly higher than those coming from conventional plots. The microbial biomass value recorded at the same time confirmed this trend showing an highest level in plots under organic management only in Ravenna site at the same sampling time (twenty month after study beginning).nonePapini R.; Ciavatta C.; Manici L.; Piovanelli C.; Agnelli A.; Brandi G.; Caputo F.; Gioacchini P.; Favilli F.; Montagna G.; Montecchio D.; Simoncini S.Papini R.; Ciavatta C.; Manici L.; Piovanelli C.; Agnelli A.; Brandi G.; Caputo F.; Gioacchini P.; Favilli F.; Montagna G.; Montecchio D.; Simoncini S