Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

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Organic compounds associated with water repellency in sandy soils
Doerr, S.H. ; Douglas, P. ; Morley, C.P. ; Llewellyn, C.T. ; Mainwaring, K.A. ; Haskins, C. ; Johnsey, L. ; Ritsema, C.J. ; Stagnitti, F. ; Ferreira, A.J.D. ; Ziogas, A.K. - \ 2005
In: Soil abiotic and biotic interactions and impact on the ecosystem and human welfare / Huang, P.M., Violante, A., Bollag, J.M., Vityakon, P., Enfield NH (USA) : Science Publishers - ISBN 1578083443
Extraction of compounds associated with water repellency in sandy soils of different origin
Doerr, S.H. ; Llewellyn, C.T. ; Douglas, P. ; Morley, C.P. ; Mainwaring, K.A. ; Haskins, C. ; Johnsey, L. ; Ritsema, C.J. ; Stagnitti, F. ; Allinson, G. ; Ferreira, A.J.D. ; Keizer, J.J. ; Ziogas, A.K. ; Diamantis, J. - \ 2005
Australian Journal of Soil Research 43 (2005)3. - ISSN 0004-9573 - p. 225 - 237.
organic-matter - hydrophobicity - variability - substances - severity
After an initial evaluation of several solvents, the efficiency of Soxhlet extractions with isopropanol/ammonia (s.g. 0.88) (70 : 30 v : v; 24 h) in extracting compounds associated with water repellency in sandy soils was examined using a range of repellent and wettable control soils (n = 15 and 4) from Australia, Greece, Portugal, The Netherlands, and the UK. Extraction efficiency and the role of the extracts in causing soil water repellency was examined by determining extract mass, sample organic carbon content and water repellency (after drying at 20°C and 105°C) pre- and post-extraction, and amounts of aliphatic C¿H removed using DRIFT, and by assessing the ability of extracts to cause repellency in acid-washed sand (AWS). Key findings are: (i) none of organic carbon content, amount of aliphatic C¿H, or amount of material extracted give any significant correlation with repellency for this diverse range of soils; (ii) sample drying at 105°C is not necessarily useful before extraction, but may provide additional information on extraction effectiveness when used after extraction; (iii) the extraction removed repellency completely from 13 of the 15 repellent samples; (iv) extracts from all repellent and wettable control soils were capable of inducing repellency in AWS. The findings suggest that compounds responsible for repellency represent only a fraction of the extract composition and that their presence does not necessarily always cause repellency.
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