Matches in SemOpenAlex for { <https://semopenalex.org/work/W2008090146> ?p ?o ?g. }
- W2008090146 endingPage "190" @default.
- W2008090146 startingPage "181" @default.
- W2008090146 abstract "The importance of soil organic matter functions is well known, but structural information, chemical composition and changes induced by anthropogenic factors such as tillage practices are still being researched. In the present paper were characterized Brazilian humic acids (HAs) from an Oxisol under different treatments: conventional tillage/maize-bare fallow (CT1); conventional tillage/maize rotation with soybean-bare fallow (CT2); no-till/maize-bare fallow (NT1); no-till/maize rotation with soybean-bare fallow (NT2); no-till/maize-cajanus (NT3) and no cultivated soil under natural vegetation (NC). Soil HA samples were analyzed by electron paramagnetic resonance (EPR), solid-state 13C nuclear magnetic resonance (13C NMR), Fourier transform infra-red (FTIR) and UV-Vis fluorescence spectroscopies and elemental analysis (CHNS). The FTIR spectra of the HAs were similar for all treatments. The level of semiquinone-type free radical determined from the EPR spectra was lower for treatments no-till/maize-cajanus (NT3) and noncultivated soil (1.74×1017 and 1.02×1017 spins g−1 HA, respectively), compared with 2.3×1017 spins g−1 HA for other soils under cultivation. The percentage of aromatic carbons determined by 13C NMR also decreases for noncultivated soil to 24%, being around 30% for samples of the other treatments. The solid-state 13C NMR and EPR spectroscopies showed small differences in chemical composition of the HA from soils where incorporation of vegetal residues was higher, showing that organic matter (OM) formed in this cases is less aromatic. The fluorescence intensities were in agreement with the percentage of aromatic carbons, determined by NMR (r=0.97 P<0.01) and with semiquinone content, determined by EPR (r=0.97 P<0.01). No important effect due to tillage system was observed in these areas after 5 years of cultivation. Probably, the studied Oxisol has a high clay content that offers protection to the clay–Fe–OM complex against strong structural alterations." @default.
- W2008090146 created "2016-06-24" @default.
- W2008090146 creator A5013681875 @default.
- W2008090146 creator A5028544707 @default.
- W2008090146 creator A5029312260 @default.
- W2008090146 creator A5040004395 @default.
- W2008090146 creator A5041459999 @default.
- W2008090146 creator A5042897964 @default.
- W2008090146 creator A5045632937 @default.
- W2008090146 creator A5062399911 @default.
- W2008090146 creator A5086812846 @default.
- W2008090146 date "2004-02-01" @default.
- W2008090146 modified "2023-10-01" @default.
- W2008090146 title "Characterization of humic acids from a Brazilian Oxisol under different tillage systems by EPR, 13C NMR, FTIR and fluorescence spectroscopy" @default.
- W2008090146 cites W177720904 @default.
- W2008090146 cites W1921187991 @default.
- W2008090146 cites W1964165614 @default.
- W2008090146 cites W1970076264 @default.
- W2008090146 cites W1973907865 @default.
- W2008090146 cites W1974088687 @default.
- W2008090146 cites W1978684995 @default.
- W2008090146 cites W1979332776 @default.
- W2008090146 cites W1987068941 @default.
- W2008090146 cites W1991762888 @default.
- W2008090146 cites W2002441485 @default.
- W2008090146 cites W2006335382 @default.
- W2008090146 cites W2020663575 @default.
- W2008090146 cites W2024222752 @default.
- W2008090146 cites W2029525138 @default.
- W2008090146 cites W2031892781 @default.
- W2008090146 cites W2034936940 @default.
- W2008090146 cites W2045451666 @default.
- W2008090146 cites W2047044905 @default.
- W2008090146 cites W2052393986 @default.
- W2008090146 cites W2052496313 @default.
- W2008090146 cites W2056264626 @default.
- W2008090146 cites W2056287217 @default.
- W2008090146 cites W2056800928 @default.
- W2008090146 cites W2060766597 @default.
- W2008090146 cites W2066666099 @default.
- W2008090146 cites W2072098845 @default.
- W2008090146 cites W2072990699 @default.
- W2008090146 cites W2073539835 @default.
- W2008090146 cites W2075016090 @default.
- W2008090146 cites W2077474374 @default.
- W2008090146 cites W2081718124 @default.
- W2008090146 cites W2109184685 @default.
- W2008090146 cites W2121332056 @default.
- W2008090146 cites W2123981120 @default.
- W2008090146 cites W2156828833 @default.
- W2008090146 cites W2320514509 @default.
- W2008090146 cites W2323090440 @default.
- W2008090146 cites W2329835996 @default.
- W2008090146 cites W4249711094 @default.
- W2008090146 doi "https://doi.org/10.1016/s0016-7061(03)00192-7" @default.
- W2008090146 hasPublicationYear "2004" @default.
- W2008090146 type Work @default.
- W2008090146 sameAs 2008090146 @default.
- W2008090146 citedByCount "136" @default.
- W2008090146 countsByYear W20080901462012 @default.
- W2008090146 countsByYear W20080901462013 @default.
- W2008090146 countsByYear W20080901462014 @default.
- W2008090146 countsByYear W20080901462015 @default.
- W2008090146 countsByYear W20080901462016 @default.
- W2008090146 countsByYear W20080901462017 @default.
- W2008090146 countsByYear W20080901462018 @default.
- W2008090146 countsByYear W20080901462019 @default.
- W2008090146 countsByYear W20080901462020 @default.
- W2008090146 countsByYear W20080901462021 @default.
- W2008090146 countsByYear W20080901462022 @default.
- W2008090146 countsByYear W20080901462023 @default.
- W2008090146 crossrefType "journal-article" @default.
- W2008090146 hasAuthorship W2008090146A5013681875 @default.
- W2008090146 hasAuthorship W2008090146A5028544707 @default.
- W2008090146 hasAuthorship W2008090146A5029312260 @default.
- W2008090146 hasAuthorship W2008090146A5040004395 @default.
- W2008090146 hasAuthorship W2008090146A5041459999 @default.
- W2008090146 hasAuthorship W2008090146A5042897964 @default.
- W2008090146 hasAuthorship W2008090146A5045632937 @default.
- W2008090146 hasAuthorship W2008090146A5062399911 @default.
- W2008090146 hasAuthorship W2008090146A5086812846 @default.
- W2008090146 hasBestOaLocation W20080901462 @default.
- W2008090146 hasConcept C107872376 @default.
- W2008090146 hasConcept C113196181 @default.
- W2008090146 hasConcept C121332964 @default.
- W2008090146 hasConcept C127413603 @default.
- W2008090146 hasConcept C13965031 @default.
- W2008090146 hasConcept C159390177 @default.
- W2008090146 hasConcept C159750122 @default.
- W2008090146 hasConcept C160892712 @default.
- W2008090146 hasConcept C163111631 @default.
- W2008090146 hasConcept C171250308 @default.
- W2008090146 hasConcept C178790620 @default.
- W2008090146 hasConcept C179538286 @default.
- W2008090146 hasConcept C185592680 @default.
- W2008090146 hasConcept C187961010 @default.
- W2008090146 hasConcept C192562407 @default.
- W2008090146 hasConcept C2780841128 @default.