- R. Carr (1)
- L.W. Dekker (1)
- J. Diamantis (1)
- S.H. Doerr (2)
- P. Douglas (1)
- A.J.D. Ferreira (1)
- C. Haskins (1)
- K. Hermon (2)
- F.A.N. Hogervorst (2)
- D. Ierodiaconou (2)
- L. Johnsey (1)
- J.J. Keizer (1)
- M. LeBlanc (3)
- L. Li (2)
- P. Li (1)
- C.T. Llewellyn (1)
- P. Maher (2)
- K.A. Mainwaring (1)
- T. March (1)
- C.P. Morley (1)
- J.Y. Parlange (1)
- C.J. Ritsema (2)
- G.H. Rooij de (6)
- G. Rooij de (1)
- S. Salzman (1)
- F. Stagnitti(older publications) (3)
- F. Stagnitti (5)
- M.M. Steenhuis (1)
- S. Struck (1)
- L.A. Thwaites (1)
- N. Turoczy (1)
- V. Versace (1)
- X. Xiong (1)
- A.K. Ziogas (1)
Near-surface distributions of soil water and water repellency under three effluent irrigation scemes in a blue gum (Eucalyptus globulus) plantation
Thwaites, L.A. ; Rooij, G.H. de; Salzman, S. ; Allinson, G. ; Stagnitti, F. ; Carr, R. ; Versace, V. ; Struck, S. ; March, T. - \ 2006
Agricultural Water Management 86 (2006)1-2. - ISSN 0378-3774 - p. 212 - 219.
spatial variability - preferential flow - wetting patterns - pinus-radiata - sandy soils - portugal - hydrophobicity - management - australia - moisture
Water repellent soils are difficult to irrigate and susceptible to preferential flow, which enhances the potential for accelerated leaching to groundwater of hazardous substances. Over 5 Mha of Australian soil is water repellent, while treated municipal sewage is increasingly used for irrigation. Only if a critical water content is exceeded will repellent soils become wettable. To avoid excessive loss of water from the root zone via preferential flow paths, irrigation schemes should therefore aim to keep the soil wet enough to maintain soil wettability. Our objective was to monitor the near-surface water content and water repellency in a blue gum (Eucalyptus globulus) plantation irrigated with treated sewage. The plantation's sandy soil surface was strongly water repellent when dry. For 4 months, three rows of 15 blue gum trees each received no irrigation, three other rows received 50% of the estimated potential water use minus rainfall, and three more rows received 100%. During this period, 162 soil samples were obtained in three sampling rounds, and their water content (% dry mass) and degree of water repellency determined. Both high and low irrigation effectively wetted up the soil and eliminated water repellency after 2 (high) or 4 (low) months. A single-peaked distribution of water contents was observed in the soil samples, but the water repellency distribution was dichotomous, with 44% extremely water-repellent and 36% wettable. This is consistent with a threshold water content at which a soil sample changes from water repellent to wettable, with spatial variability of this threshold creating a much wider transition zone at the field scale. We characterized this transition zone by expressing the fraction of wettable samples as a function of water content, and demonstrated a way to estimate from this the wettable portion of a field from a number of water content measurements. To keep the plantation soil wettable, the water content must be maintained at a level at which a significant downward flux is likely, with the associated enhanced leaching. At water contents with negligible downward flux, the field is water repellent, and leaching through preferential flow paths is likely. Careful management is needed to resolve these conflicting requirements.
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.
Effects of clay amendment on adsorption and desorption of copper in water repellent soils
Xiong, X. ; Stagnitti, F. ; Allinson, G. ; Turoczy, N. ; Li, P. ; LeBlanc, M. ; Cann, M.A. ; Doerr, S.H. ; Steenhuis, M.M. ; Parlange, J.Y. ; Rooij, G. de; Ritsema, C.J. ; Dekker, L.W. - \ 2005
Australian Journal of Soil Research 43 (2005)3. - ISSN 0004-9573 - p. 397 - 402.
heavy-metals - sorption characteristics - cadmium - zinc
Copper is an important micronutrient and trace amounts are essential for crop growth. However, high concentrations of copper will produce toxic effects. Australia is increasingly developing production of crops in water repellent soils. Clay amendment, a common amelioration techniques used in Australia, has demonstrated agronomic benefits in increased crop or pasture production. The sorption and desorption of copper and the effect of clay treatment on copper behaviour in a water repellent soil collected from an experimental farm in South Australia is studied. We found that the water repellent soils amended with clay have an increased adsorption capacity of copper. Also the clay-amended soils had an increased ratio of specific sorption to total sorption of copper. The implications of this study to the sustainable agro-environmental management of water repellent soils is discussed
|Recycled effluent irrigation in vineyards: An Australian case study; II Management for sustainability
Maher, P. ; Hermon, K. ; Ierodiaconou, D. ; Stagnitti, F. ; Allinson, G. ; Armstrong, R. ; LeBlanc, M. ; Rooij, G.H. de; Hogervorst, F.A.N. ; Bloem, E. - \ 2004
In: Recent Research Developments in Crop Science Trivandrum, Kerala, India : Research Signpost - ISBN 8127100463 - p. 433 - 449.
|Recycled effluent irrigation in vineyards: An Australian case study; I. Issues and monitoring
Hermon, K. ; Maher, P. ; Ierodiaconou, D. ; Stagnitti, F. ; Allinson, G. ; Armstrong, R. ; LeBlanc, M. ; Rooij, G.H. de; Bloem, E. ; Hogervorst, F.A.N. - \ 2004
In: Recent Research Developments in Crop Science Trivandrum, Kerala, India : Research Signpost - ISBN 8127100463 - p. 417 - 432.
|A statistical distribution for measuring solute and water flux heterogeneity in vadose zone experiments
Stagnitti, F. ; Rooij, G.H. de; Li, L. ; Allinson, G. - \ 1999
In: Scale and Variability Issues in the Soil-Hydrological System : proceedings of the Workshop on Scale and Variability Issues in the Soil-Hydrological System, Wik's Casle, Sweden, 25-27 August 1999. / A. Gärdenäs (Ed). - Swedish University of Agricultural Sciences, SLU, Uppsala. - ISSN 0282-6569 - p. 12 - 12.
|Quantification of heterogeneity in solute- and water-flux in soil
Stagnitti, F. ; Rooij, G.H. de; Allinson, G. ; Li, L. - \ 1999
In: Proceedings of Emerging Technologies for Sustainable Landuse and Water Management (Envirowater 99), Lausanne, Switzerland, 1-3 September 1999. / A. Musy, L. Santos-Pereira and M. Fritsch (eds), Presses Polytechniques et Universitaires Romandes. - ISBN 2-88074-438-5, Full paper published in CD-ROM - p. 40 - 40.
|Application of the Beta statistical distribution for determining the degree of heterogeneity in water and solute distributions in soils
Stagnitti, F. ; Rooij, G.H. de; Allinson, G. - \ 1999
In: EOS, Supplement, Spring Meeting, Boston, H51A-06, American Geophysical Union - p. 149 - 149.