Field study of pesticide leaching in a Himatangi sand (Manawatu) and in a Kiripaka bouldery clay loam (Northland). 1. Results

Soil Research ◽  
2005 ◽  
Vol 43 (4) ◽  
pp. 457 ◽  
Author(s):  
Murray E. Close ◽  
Robert Lee ◽  
Gujja N. Magesan ◽  
Michael K. Stewart ◽  
George Skuse ◽  
...  
Keyword(s):  
New Zealand ◽  
Soil Profile ◽  
Preferential Flow ◽  
Soil Sampling ◽  
Clay Loam ◽  
Deuterated Water ◽  
Intense Rainfall ◽  
Pesticide Application ◽  
Rapid Degradation ◽  
Structured Soil

Five pesticides, atrazine, diazinon, hexazinone, procymidone, and terbuthylazine, were applied to a Kiripaka bouldery clay loam located near Whangarei, Northland, New Zealand, and a Himatangi sand located near Palmerston North, Manawatu, along with bromide and deuterated water as tracers. Their transport and persistence were monitored for 18 months using soil sampling down to a maximum of 1 m and 8 suction cups at each site located between 0.2 and 1.5 m down the profile. There was rapid leaching of the tracers as well as hexazinone at both sites. Procymidone was much less mobile than the tracers but was very persistent, with significant amounts still present in the profile after 18 months. Atrazine, terbuthylazine, and diazinon had relatively low persistence, mainly due to rapid degradation, and possibly volatilisation for diazinon, with < 10% remaining after 6 months at both sites. There was evidence of preferential flow at the Northland site, which is consistent with the highly structured soil profile and intense rainfall that occurred at the site in the month following pesticide application. Batch sorption experiments measured lower Koc values for the topsoil samples than generally observed in the literature for all 5 pesticides. This indicates that these pesticides will be much more mobile in the Northland Kiripaka soil and slightly more mobile in the Manawatu Himatangi soil than would be expected from the literature values.

Field and laboratory study of pesticide leaching in a Motupiko silt loam (Nelson) and in a Waikiwi silt loam (Southland)

Soil Research ◽  
2006 ◽  
Vol 44 (6) ◽  
pp. 569 ◽  
Author(s):  
M. E. Close ◽  
A. K. Sarmah ◽  
M. J. Flintoft ◽  
J. Thomas ◽  
B. Hughes
Keyword(s):  
New Zealand ◽  
Laboratory Study ◽  
Preferential Flow ◽  
Sorption Isotherms ◽  
Soil Sampling ◽  
Silt Loam ◽  
Pesticide Application ◽  
Transport Behaviour ◽  
Suction Cups ◽  
Pesticide Leaching

Selected pesticides were applied to a Motupiko silt loam located near Wakefield, Nelson, and a Waikiwi silt loam located near Invercargill, Southland, New Zealand, along with bromide as a tracer. Atrazine, bromacil, diazinon, hexazinone, and terbuthylazine were applied to both sites, with procymidone also being applied to the Nelson site, and trifluralin being applied to the Southland site. The persistence and transport behaviour of these compounds were monitored for 15 months using a combination of soil sampling down to a maximum of 1 m and 8 suction cups at each site located between 0.2 and 1.3 m down the profile. The bromide tracer had moved below 0.8 m within 9 months at the Nelson site and below 1.0 m within 12 months at the Southland site. Hexazinone was the most mobile of the pesticides, followed by bromacil at both sites. Diazinon and atrazine dissipated rapidly at both sites, while trifluralin and, to a lesser extent, terbuthylazine and bromacil data indicated some volatilisation losses. The diazinon removal was probably a combination of degradation and volatilisation. There was evidence of some preferential flow at the Southland site, as rainfall was heavy at the time of pesticide application. The Koc values from the sorption isotherms were generally similar to literature values for the Waikiwi soil but were much higher for the Motupiko soil. The exception was diazinon, for which the Koc values were much lower than the literature values for both sites.

scholarly journals Transport of iodide in structured clay-loam soil under maize during irrigation experiments analyzed using HYDRUS model

Biologia ◽  
2014 ◽  
Vol 69 (11) ◽  
Author(s):  
Agota Horel ◽  
Ľubomír Lichner ◽  
Abdallah Alaoui ◽  
Henryk Czachor ◽  
Viliam Nagy ◽  
...  
Keyword(s):  
Soil Profile ◽  
Preferential Flow ◽  
Current Knowledge ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Iodide Transport ◽  
131I Activity ◽  
Solute Movement ◽  
Structured Clay ◽  
Loam Soil

AbstractTransport of radioactive iodide 131I− in a structured clay loam soil under maize in a final growing phase was monitored during five consecutive irrigation experiments under ponding. Each time, 27 mm of water were applied. The water of the second experiment was spiked with 200 MBq of 131I− tracer. Its activity was monitored as functions of depth and time with Geiger-Müller (G-M) detectors in 11 vertically installed access tubes. The aim of the study was to widen our current knowledge of water and solute transport in unsaturated soil under different agriculturally cultivated settings. It was supposed that the change in 131I− activity (or counting rate) is proportional to the change in soil water content. Rapid increase followed by a gradual decrease in 131I− activity occurred at all depths and was attributed to preferential flow. The iodide transport through structured soil profile was simulated by the HYDRUS 1D model. The model predicted relatively deep percolation of iodide within a short time, in a good agreement with the observed vertical iodide distribution in soil. We found that the top 30 cm of the soil profile is the most vulnerable layer in terms of water and solute movement, which is the same depth where the root structure of maize can extend.

Field study of pesticide leaching in an allophanic soil in New Zealand. 1: Experimental results

Soil Research ◽  
2003 ◽  
Vol 41 (5) ◽  
pp. 809 ◽  
Author(s):  
M. E. Close ◽  
G. N. Magesan ◽  
R. Lee ◽  
M. K. Stewart ◽  
J. C. Hadfield
Keyword(s):  
New Zealand ◽  
Field Study ◽  
Soil Sampling ◽  
Experimental Results ◽  
Deuterated Water ◽  
Complementary Information ◽  
Leaching Process ◽  
Irrigation Period ◽  
Suction Cups ◽  
Allophanic Soil

Seven pesticides, 2,4-D, atrazine, hexazinone, picloram, procymidone, terbuthylazine, and triclopyr, were applied to a Horotiu soil (allophanic loamy silt) located near Hamilton, New Zealand, along with 2 tracer compounds, bromide and deuterated water. Their movement and persistence was monitored for about 2�years using soil sampling down to a maximum of 1 m and 9 suction cups located between 0.2 and 2.5 m down the profile. There was rapid leaching of the tracers as well as hexazinone, picloram, and, to a lesser extent, triclopyr. Procymidone was much less mobile but was very persistent. Atrazine, terbuthylazine, and 2,4-D showed low mobility and persistence at the study site. Bromide and hexazinone were observed in the underlying groundwater following winter recharge and an intensive irrigation period at the end of the study. There was slight adsorption of bromide by the allophane in the soil. The combination of both soil sampling and suction cups gave a more complete description of the leaching process and the distribution of the compound through the profile than either technique by itself. This combination is worthwhile and gives complementary information providing the strengths and limitations of both techniques are appreciated.

scholarly journals Field and numerical study of chlorotoluron transport in the soil profile

2011 ◽  
Vol 50 (No. 8) ◽  
pp. 333-338 ◽  
Author(s):  
R. Kodešová ◽  
J. Kozák ◽  
O. Vacek
Keyword(s):  
Adsorption Isotherm ◽  
Solute Transport ◽  
Soil Water ◽  
Soil Profile ◽  
Preferential Flow ◽  
Water Movement ◽  
Numerical Study ◽  
Soil Samples ◽  
Transport Parameters ◽  
Four Square

The transport of chlorotoluron in the soil profile under field conditions was studied. The herbicide Syncuran was applied on a four square meter plot using an application rate of 2.5 kg/ha active ingredient. Soil samples were taken after 119 days to study the residual chlorotoluron distribution in the soil profile. HYDRUS-1D (&Scaron;imůnek et al. 1998) was used to simulate water movement and herbicide transport in the soil profile. Soil hydraulic properties and their variability were studied previously by Kut&iacute;lek et al. (1989). The solute transport parameters, like the adsorption isotherm and the degradation rate, were determined in the laboratory. The Freundlich and Langmuir equations were used to fit the experimental data points of the adsorption isotherm, and the affect of each type of adsorption isotherm equation on the solute transport was studied. The chlorotoluron concentrations in soil water tended to be higher for the simulation performed with the Freundlich isotherm then that of the model using the Langmuir isotherm. In both cases, the solution did not pass a depth of8 cm. The simulated chlorotoluron concentrations in soil samples were higher then the observed concentrations when the chlorotoluron degradation was assumed to be in soil water only. Assumption of the solute degradation in both in the solid and the liquid phase significantly improved the accuracy of the solution. The different characters of the simulated and observed chlorotoluron distributions can probably be attributed to the preferential flow of water and solute in the soil profile and by variability of the transport parameters.

Influence of the shape of inter-horizon boundary and size of soil tongues on preferential flow under shallow groundwater conditions: A simulation study

2011 ◽  
Vol 91 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Priyantha B. Kulasekera ◽  
Gary W. Parkin
Keyword(s):  
Solute Transport ◽  
Vadose Zone ◽  
Simulation Study ◽  
Soil Profile ◽  
Preferential Flow ◽  
Shallow Groundwater ◽  
Soil Horizon ◽  
Tongue Length ◽  
The Impact ◽  
Water And Solute Transport

Kulasekera, P. B. and Parkin, G. W. 2011. Influence of the shape of inter-horizon boundary and size of soil tongues on preferential flow under shallow groundwater conditions: A simulation study. Can. J. Soil Sci. 91: 211–221. Detailed studies of the impact of soil tongues at soil horizon interfaces are very important in understanding preferential flow processes through layered soils and in improving the accuracy of models predicting water and solute transport through the vadose zone. The implication of having soil tongues of different shapes and sizes created at the soil horizon interface on solute transport through a layered soil horizon was studied by simulating water and solute transport using the VS2DI model. This 2-D simulation study reconfirmed that soil tongues facilitate preferential flow, and the level of activeness of tongues may depend on the number of soil tongues, their spacing and distribution. Also, the size of the soil tongues (length and diameter at the interface between the soil horizons) and their shape influence the rate of preferential flow. Increasing tongue length consistently resulted in an increase in solute velocity across the entire soil profile regardless of the tongue shape; for example, a soil tongue of 0.25 m length increased solute velocity by about 1.5 times over a soil profile without tongues, but this increase might be different for soil types and groundwater conditions other than those considered in this study. Narrowing of tongues increased solute velocity, whereas increasing the number of tongues in a wider soil profile decreased the solute-front's velocity. As tongue length increased, the area containing solutes at prescribed elapsed times decreased. An implication of this study is that soil horizon tongue shape and spacing reduce pollutant residence times, hence inter-horizon boundary morphology should be considered when modelling transport through the vadose zone. As well, since the solute velocity behaviours of a triangular- and a wider rectangular-shaped tongue were nearly identical, simply measuring solute velocity in the field will reveal little information on the shape of a soil tongue.

Earthquake Microzoning from Soil Properties

1993 ◽  
Vol 9 (2) ◽  
pp. 209-231 ◽  
Author(s):  
A. P. W. Hodder ◽  
M. Z. Graham
Keyword(s):  
Shear Strength ◽  
New Zealand ◽  
Linear Regression ◽  
Soil Properties ◽  
Shear Wave Velocity ◽  
Soil Type ◽  
Soil Profile ◽  
Soil Structure ◽  
Viscous Damping ◽  
Extent Of Damage

The extent of damage caused by an earthquake in Wellington, New Zealand, in 1968 to buildings erected on a variety of regoliths and foundation materials is correlated with the thickness of the regolith, the depth to the water table and semi-quantitative parameters derived from soil profile descriptions, particularly related to soil type and soil structure. From linear regression correlations, the expected damage for a comparable earthquake elsewhere can be determined. The model was tested for soil data for the Edgecumbe area, hit by a damaging earthquake in 1987. The predictions were sufficiently in accord with observations to suggest that soil properties that reflect the geotechnical properties of the upper parts of the regolith, particularly those that measure the shear strength, shear wave velocity and viscous damping of that material, may be useful for earthquake microzoning purposes in areas where there is a considerable thickness of unconsolidated materials above bedrock.

scholarly journals Short-term legacy effects of feedlot manure amendments on water-extractable organic carbon in a clay loam soil profile

2019 ◽  
Vol 99 (1) ◽  
pp. 36-45 ◽  
Author(s):  
J.J. Miller ◽  
M.L. Owen ◽  
X. Hao ◽  
C.F. Drury ◽  
D.S. Chanasyk
Keyword(s):  
Organic Carbon ◽  
Soil Profile ◽  
Land Application ◽  
Legacy Effects ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Leaching Potential ◽  
Water Extractable Organic Carbon ◽  
Loam Soil ◽  
Water Extractable

Limited research exists on legacy effects of land application of feedlot manure on accumulation, redistribution, and leaching potential of water-extractable organic carbon (WEOC) in soil profiles. We sampled a clay loam soil at six depths (0–1.50 m) 2 yr after the last application (2014) of 17 continuous annual manure applications (since 1998). The amendment treatments were stockpiled (SM) or composted (CM) feedlot manure containing straw (ST) or wood-chip (WD) bedding at three application rates (13, 39, and 77 Mg ha−1dry basis). There was also an unamended control (CON) and inorganic fertilizer (IN) treatment. The soil samples were analyzed for concentrations of WEOC. The total mass or accumulation of WEOC in the soil profile was greater (P ≤ 0.05) by 1.2–3.3 times for the CM-ST-77 treatment than 12 of 14 other treatments, and it was significantly greater for amended than CON or IN treatments. The total WEOC mass was 14%–20% greater for CM-ST than CM-WD, SM-ST, and SM-WD treatments, and it was 16%–22% greater for CM than SM at the 39 and 77 Mg ha−1rates. The 77 Mg ha−1rate of the four manure type-bedding treatments had the significantly greatest (by 37%–527%) concentrations of WEOC at the six depths compared with other treatments, suggesting greater redistribution and leaching potential. Significant manure effects occurred on soil WEOC 2 yr after the manure was last applied following 17 continuous applications, and it indicated an increased risk of leaching potential at the higher application rate.

The effect of preferential flow on the short and long-term spatial distribution of surface applied solutes in a structured soil

Geoderma ◽  
1999 ◽  
Vol 90 (3-4) ◽  
pp. 229-241 ◽  
Author(s):  
Sigen Chen ◽  
Ralph E Franklin ◽  
Virgil L Quisenberry ◽  
Pingli Dang
Keyword(s):  
Spatial Distribution ◽  
Preferential Flow ◽  
Short And Long Term ◽  
Structured Soil

Induced uneven spatial distribution of agrochemicals due to preferential flow in water repellent soils and its remediation by surfactant

2020 ◽  
Author(s):  
Felix Abayomi Ogunmokun ◽  
Rony Wallach
Keyword(s):  
Spatial Distribution ◽  
Soil Water ◽  
Soil Profile ◽  
Preferential Flow ◽  
Sandy Soils ◽  
Water Repellency ◽  
Treated Wastewater ◽  
Water Repellent ◽  
Soil Water Repellency ◽  
Mediterranean Countries

&lt;p&gt;Soil water repellency is a common feature of dry soils under permanent vegetation and drought conditions. Soil-water hydrology is markedly affected by soil-water repellency as it hinders infiltration, leading to enhanced surface runoff and soil erosion. Although this phenomenon was primarily ascribed to sandy soils, it has been observed in loam, clay, and peat soils in dry and humid regions. One detrimental effect of soil water repellency on plants is the reduction of soil water availability that stems from the non-uniform water retention and flow in preferential pathways (gravity-induced fingers) with relatively dry soil volume among these paths. It was recently discovered that prolonged irrigation with treated wastewater, a widely used alternative in Israel and other Mediterranean countries due to the limited freshwater, triggers soil water repellency which invariably resulted in preferential flow development in the field. Due to climate change events, the use of treated wastewater for irrigation as a means of freshwater conservation is expected to widen, including in countries that are not considered dry.&lt;/p&gt;&lt;p&gt;While a vast amount of research has been devoted to characterizing the preferential flow in water repellent soils, the effect of this flow regime on the spatial distribution of salt and fertilizers in the root zone was barely investigated. Results from a commercial citrus orchard irrigated with treated wastewater that includes the spatial and temporal distribution of preferential flow in the soil profile measured by ERT will be demonstrated. The associated spatial distribution of salinity, nitrate, phosphate, and SAR in the soil profile will be shown as well.&amp;#160; We investigated the efficacy of two nonionic surfactants application to remediate hydrophobic sandy soils both in the laboratory and field. The effect of the surfactant application to the water repellent soils in the orchards on the spatial distribution of soil moisture and the associated agrochemicals will be presented and discussed.&lt;/p&gt;

Transport of iodide in structured soil under spring barley during irrigation experiment analyzed using dual-continuum model

Biologia ◽  
2013 ◽  
Vol 68 (6) ◽  
Author(s):  
Jaromír Dušek ◽  
Ľubomír Lichner ◽  
Tomáš Vogel ◽  
Vlasta Štekauerová
Keyword(s):  
Continuum Model ◽  
Preferential Flow ◽  
Root Zone ◽  
Spring Barley ◽  
Soil Matrix ◽  
Iodide Transport ◽  
Loam Soil ◽  
Water Drops ◽  
Structured Soil ◽  
The One

AbstractTransport of radioactive iodide 131I− in a black clay loam soil under spring barley in an early ontogenesis phase was monitored during controlled field irrigation experiment. It was found that iodide bound in the soil matrix could be mobilized by the surface leaching enhanced by mechanical impact of water drops and transported below the root zone of crops via soil cracks. The iodide transport through structured soil profile was simulated by the one-dimensional dual-continuum model, which assumes the existence of two inter-connected flow domains: the soil matrix domain and the preferential flow domain. The model predicted relatively deep percolation of iodide within a short time, in a good agreement with the observed vertical iodide distribution in soil. The dual-continuum approach proved to be an adequate tool for evaluation of field irrigation experiments conducted in structured soils.

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