EurekaMag.com logo
+ Site Statistics
References:
48,253,228
Abstracts:
22,798,842
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
EurekaMag PDF Full Text Supply ServicePDF Full Text Supply Service
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn
Follow on LinkedInFollow on Tumblr

+ Translate

Ethanol-soluble and insoluble fractions of non-humic substances in soil fulvic acids


, : Ethanol-soluble and insoluble fractions of non-humic substances in soil fulvic acids. Soil Science & Plant Nutrition 38(3): 401-409

The non-humic substances in fulvic acids (FAs) of three Japanese soils were obtained as the non-adsorbed fraction through a column of insoluble polyvinylpyrrolidone (PVP), and this fraction was further fractionated based on the solubility in ethanol. Although the yield of the ethanol-soluble fractions from the PVP-non-adsorbed FAs was 5-7%, the analytical data indicated that their chemical structure was clearly different from that of the ethanol-insoluble fractions. The ethanol-soluble fractions were characterized by low average molecular weights, low saccharide contents and strong peaks for aliphatic C-H, alcoholic C-O, and carboxyl groups in the IR spectra. The 13C-NMR spectrum of this fraction in the ando soil that was determined quantitatively also showed strong peaks for the long alkyl chain, secondary alcohol or aliphatic ether, and carboxy groups. The main constituents of the ethanol-insoluble fractions consisted of polysaccharides. Contents and composition of saccharides, however, varied depending on the soil types. Pentose content of the insoluble fraction was very high in the lowland paddy soil, and the uronic acid content was higher in the ando soil than in the other two soils. The carbohydrate-C content of the insoluble fractions estimated from 13C-NMR spectra was in the order of lowland paddy soil, ando soil, and brown forest soil. The aliphatic-C content was in the opposite order. These findings suggested that abundant plant components remained in the FA of the lowland paddy soil while many aliphatic components were incoporated into the the FA of the brown forest soil.

(PDF same-day service: $19.90)

Order PDF Full Text

Close
Close

Click here to order any other PDF Full Text


Accession: 002373633

DOI: 10.1080/00380768.1992.10415072

PDF Full Text: Submit


Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:
Close
Close

Other references

Williams, G. P.; Hoehing, W. W.; Byington, R. G., 1988: Causes of ammonia plant shutdowns: survey V. A survey of ammonia plant shutdowns is presented which addresses the operation history for the past four years of 136 ammonia plants in 40 countries and focuses on the causes of their 5,884 shutdowns and downtime equivalent to 98 years. Detailed s...

Stenstrom E., 1991: The effects of flooding on the formation of ectomycorrhizae in pinus sylvestris seedlings. Pinus sylvestris seedlings, grown in a vertical petri dish system, were inoculated with five different mycorrhizal fungi. Half of the root system in the petridish was subjected to periodic flooding, and mycorrhizal colonization was studied. Thelep...

Osterhout, G. J.; Brequet, I.; O'brien, T. P., 1997: Utilization of PCR for the identification of nontuberculous mycobacterial keratitis isolates. Investigative Ophthalmology & Visual Science 38(4 PART 1-2): S870

Bonde, R., 1939: Comparative studies of the bacteria associated with Potatoblackleg and seed-piece decay. A considerable proportion of the 62 bacteria found associated with potato blackleg, seed-piece decay, and soft rot in Maine and South Carolina, besides showing strong mutual similarities and a capacity for causing both blackleg and soft rot, were...

Pugin V. A.; Khitarov N. I., 1968: The Al (sub 2) O (sub 3) -SiO (sub 2) system at high temperatures and pressures. Kyanite-sillimanite-andalusite system, triple point near 7600 bar and 540 degrees C.

Sheffield, J.; Cunningham, F.G.ry, 2002: Heart failure during pregnancy caused by thyrotoxic cardiomyopathy. American Journal of Obstetrics & Gynecology 187(6 Supplement): S199, December

Mondal, A.; Sinha, S.; Kurths, J., 2009: Rapidly switched random links enhance spatiotemporal regularity. We investigate the spatiotemporal properties of a lattice of chaotic maps whose coupling connections are rewired to random sites with probability p . Keeping p constant, we change the random links at different frequencies in order to discern the e...

C. A. Furness, 2008: Successive microsporogenesis in eudicots, with particular reference to Berberidaceae (Ranunculales). The eudicot clade of angiosperms is characterised by simultaneous microsporogenesis and tricolpate pollen apertures. Successive microsporogenesis, where a distinct dyad stage occurs after the first meiotic division, is relatively rare in eudicots...

Spear R. W.; Cwynar Les C.; Kurek Joshua; Sillick Craig D.; Stork Allison J.; Clayton Patrick L., 2003: The vegetation record of early Holocene climate in the White Mountains of New Hampshire and Maine. The transition from Late-Glacial to Holocene climates and variability in early Holocene climates can be inferred from changes in the percent organic matter of lake sediments at sites in the White Mountains of New Hampshire and Maine. High-resoluti...

Bennett, A.G.; Rabbetts, R.B., 1978: Refraction in oblique meridians of the astigmatic eye. British Journal of Physiological Optics 32: 59-77