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Doped calcite (Fe-EDDHSA/CaCO3) was experimentally produced. The hypothesis of the present experiment is that, when roots get in contact with Fe-EDDHSA/CaCO3, the extrusion of H+ decreases the pH and dissolves calcite with subsequent release of Fe that becomes available for roots. The aim of the experiment was to determine whether doped calcite might represent a slow-release Fe source for in-vitro grown kiwifruit plantlets. The root elongation media used in the experiment had pH 8.0 and differed from each other for Fe supply as follow: Control medium that contained complete Murashige and Skoog salt mixture, including FeSO4 and Na2EDTA; calcite medium enriched with Fe-EDDHSA/CaCO3 as the only Fe source; −Fe medium without Fe. The absence of FeSO4 in the medium caused a reduction of plantlet growth. The final pH was higher with calcite medium than in control and −Fe. The addition of Fe-EDDHSA/CaCO3 increased Fe shoot concentration when compared with the −Fe medium. The data of the present experiment show the potential Fe slow release ability of Fe-EDDHSA/CaCO3; however, further investigation on Fe containing fertilizers should be conducted on potted plants to validate our results.

Gli elementi che concorrono alla nutrizione vegetale, se si eccettuano il carbonio, l’idrogeno e l’ossigeno che sono assunti dall’aria e dall’acqua, vengono assorbiti dal suolo e possono essere chiamati macroelementi o microelementi a seconda della quantità richiesta. I macroelementi vengono distinti in principali, o macroelementi propriamente detti (azoto, fosforo e potassio), e secondari o mesoelementi (zolfo, calcio e magnesio) anche se tale suddivisione non deve considerarsi rigida. Talvolta il sodio viene aggiunto alla lista degli elementi secondari e il cobalto a quella dei microelementi.

Gli elementi che concorrono alla nutrizione vegetale, se si eccetuano il carbonio, idrogeno e ossigeno che sono assunti dall’aria e dall’acqua, vengono assorbiti dal suolo e possono essere chiamati macroelementi o microelementi a seconda della quantità richiesta. I macroelementi vengono distinti in principali, o macroelementi propriamente detti (azoto, fosforo e potassio), e secondari o mesoelementi (zolfo, calcio e magnesio). Tale suddivisione non deve considerarsi rigida. Tal volta il sodio viene aggiunto alla lista degli elementi secondari e il cobalto a quella dei microelementi.

The effect of organic fertilisation on the level of total organic carbon (TOC) in an 18-years old pear orchard (cv. Abate Fetel) was evaluated vs. a conventional pearorchard mineral fertilized (control). In both orchards soil samples (Typic Udochrept loamy soil) were taken at two depths (0-15 and 30-50 cm) along the row tilled and mainly amended with compost) and in the inter-row space (grassed with different Graminaceae species in the organic orchard, bare in the conventional orchard). The area (elevation 20 m), located in Bologna province, Emilia-Romagna Region (Italy), is characterised by mean annual temperature 13.1 °C and rainfall around 750 mm. In the horizon 0-15 cm of the row an increase of about 14 tons ha-1 of TOC has been calculated after 18-years of cultivation and amendment compared to the control soil, which had received just mineral fertilisation. A significant increase of TOC (about 6.3 tons ha-1) was also measured in the top layer (0-15 cm) in the grassed inter-row, where this C sink is exclusively due to the cover crop. A survey of the role of organic vs. conventional farming on soil C sink/source is started in 2007 in 8 typical organic orchard farms located in Emilia-Romagna Region and it is still running.

Póster presentado en la Sesión: BG2.7/SSS1.1: Molecular, isotopic and associated modeling techniques focusing on terrestrial ecosystem (co-organized).-- Congreso celebrado del 7-12, abril 2013, Viena, Austria., Smouldering fires are slow, low temperature, flameless and the most persistent form of combustion of organic matter (OM) in porous form. Although smouldering fires of peatlands represent a large perturbation of the atmospheric chemistry, to date, most studies on smouldering focused on ignition, carbon (C) losses or emissions, whereas the literature still lacks understanding of the OM evolution following these events., The present research was financed by the Italian PRIN program 2009 (2009NBHPWR - Project title: “Chemical and biomolecular indicators for reconstructing environmental changes in natural archives”)