139 research outputs found
Bioavailability of micronutrients and heavy metals, and the effects of organic matter in binding mechanisms
No full textEffect of compost and manure amendments on zinc bioavailability in an artificially contaminated soil
No full textApplicazione della microtomografia di fluorescenza di raggi X allo studio della distribuzione dello Zn in piante di Eruca vesicaria allevate in un suolo contaminato e ammendato con compost
No full textApplicazione di compost e letame ed effetti sulla disponibilità dello zinco in un suolo artificialmente contaminato
No full textEffect of compost and manure amendments on zinc soil speciation, plant content, and translocation in an artificially contaminated soil.
No full textEffetto del compost sulla speciazione dello Zn in un suolo artificialmente contaminato e in piante coltivate: valutazione con tecniche analitiche convenzionali ed avanzate (raggi X di sincrotrone)
No full textApplicazione di compost ed effetti sulle disponibilità di metalli pesanti in un suolo artificialmente contaminato
No full textEvaluation of Atriplex Halimus, Medicago Lupulina and Portulaca Oleracea For Phytoremediation of Ni, Pb, and Zn
No full textSuitable plant species are able to accumulate heavy metals and to produce biomass useful
for non-food purposes. In this study, three endemic Mediterranean plant species, Atriplex
halimus, Portulaca oleracea and Medicago lupulina were grown hydroponically to assess
their potential use in phytoremediation and biomass production. The experiment was carried
out in a growth chamber using half strength Hoagland’s solutions separately spiked with 5
concentrations of Pb and Zn (5, 10, 25, 50, and 100 mg L−1), and 3 concentrations of Ni
(1, 2 and 5 mg L−1). Shoot and root biomass were determined and analyzed for their metals
contents. A. halimus and M. lupulina gave high shoot biomass with relatively low metal
translocation to the above ground parts. Metals uptake was a function of both metals and
plant species. It is worth noting that M. lupulina was the only tested plant able to grow in
treatment Pb50 and to accumulate significant amount of metal in roots. Plant metal uptake
efficiency ranked as follows: A. halimus>M. lupulina>P. oleracea. Due to its high biomass
production and the relatively high roots metal contents, A. halimus and M. lupulina could
be successfully used in phytoremediation, and in phytostabilization, in particular
Net carbon flux in organic and conventional olive production systems
No full textAgricultural systems are considered as one of the most relevant sources of atmospheric carbon. However, agriculture has the potentiality to mitigate carbon dioxide mainly through soil carbon sequestration. Some agricultural practices, particularly fertilization and soil management, can play a dual role in the agricultural systems regarding the carbon cycle contributing to the emissions and to the sequestration process in the soil. Good soil and input managements affect positively Soil Organic Carbon (SOC) changes and consequently the carbon cycle. The present study aimed at comparing the carbon footprint of organic and conventional olive systems and to link it to the efficiency of both systems on carbon sequestration by calculating the net carbon flux. Data were collected at farm level through a specific and detailed questionnaire based on one hectare as a functional unit and a system boundary limited to olive production. Using LCA databases particularly ecoinvent one, IPCC GWP 100a impact assessment method was used to calculate carbon emissions from agricultural practices of both systems. Soil organic carbon has been measured, at 0-30 cm depth, based on soil analyses done at the IAMB laboratory and based on reference value of SOC, the annual change of SOC has been calculated. Substracting sequestrated carbon in the soil from the emitted on resulted in net carbon flux calculation. Results showed higher environmental impact of the organic system on Global Warming Potential (1.07 t CO2 eq. yr-1) comparing to 0.76 t CO2 eq. yr-1 in the conventional system due to the higher GHG emissions caused by manure fertilizers compared to the use of synthetic foliar fertilizers in the conventional system. However, manure was the main reason behind the higher SOC content and sequestration in the organic system. As a resultant, the organic system showed higher net carbon flux (-1.7 t C ha-1 yr-1 than -0.52 t C ha-1 yr-1 in the conventional system reflecting higher efficiency as a sink for atmospheric CO2 (the negative value of Net C flux indicates that a system is a net sink for atmospheric CO2). In conclusion, this study illustrates the importance of including soil carbon sequestration associated with CO2 emissions in the evaluation process between alternatives of agricultural systems. Thus, organic olive system offers an opportunity to increase carbon sequestration compared to the conventional one although it causes higher C emissions from manure fertilization. Keywords: Net carbon flux, GHG, organic, olive, soil organic carbo
Two different analytical approaches in Laser Induced Breakdown Spectroscopy (LIBS) technique to determine elemental concentrations in soils
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