Preferential paths of flow under conventional and conservation tillage

Andreini, M.; Steenhuis, Tammo S.

doi:10.1016/0016-7061(90)90009-x

Cited by 180 publications

(87 citation statements)

References 8 publications

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“…However these properties are altered by tillage of the soil, (Elwell 1992;Beare et al 1994). Andreini and Steenhuis (1990) observed preferential flow under no-till plots whereas there was no such flow under conventional tillage and they attributed this to existence of macropores under no-till.…”

Section: Introductionmentioning

confidence: 99%

Residual effects of fallows on selected soil hydraulic properties in a kaolinitic soil subjected to conventional tillage (CT) and no tillage (NT)

2007

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Improved fallows have been used to reduce time required for soil fertility regeneration after cropping in low input agricultural systems. In semi-arid areas of Southern Africa, Acacia angustissima and Sesbania sesban are among some of the more widely used improved fallow species. However the residual effects of improved fallows on soil hydraulic properties during the cropping phase is not known. The aim of this study was to quantify the residual effects of fallows and tillage imposed at fallow termination on soil hydraulic properties (infiltration rates, hydraulic conductivity and soil porosity) during the cropping phase. Treatments evaluated were planted fallows of Acacia angustissima, Sesbania sesban and natural fallow (NF) and continuous maize as a control. Steady state infiltration rates were measured using a double ring infiltrometer and porosity was calculated as the difference between saturated infiltration rates and tension infiltration measurements on an initially saturated soil. Unsaturated hydraulic conductivity (K o ) and mean pore sizes of water conducting pores were measured using tension infiltrometer at tensions of 5 and 10 cm of water on an initially dry soil. While there was no significant difference in steady state infiltration rates from double ring infiltrometer measurements among the fallow treatments, these were significantly higher than the control. The steady state infiltration rates were 36, 67, 59 and 68 mm h -1 for continuous maize, A. angustissima, S. sesban and NF respectively. Tillage had no significant effect on steady state infiltration rate. Pore density at 5 cm tension was significantly higher in the three fallows than in maize and varied from 285-443 m -2 in fallows, while in continuous maize the pore density was less than 256 m -2 . At 10 cm tension pore density remained significantly higher in fallows and ranged from 4,521-8,911 m -2 compared to 2,689-3,938 m -2 in continuous maize. Unsaturated hydraulic conductivities at 5 cm tension were significantly higher in fallows than in continuous maize and were 0.9, 0.7, 0.8 cm and 0.5 cm h -1 for A. angustissima, S. sesban, NF and continuous maize, respectively. However there were no significant treatment differences at 10 cm tension. Fallows improved infiltration rates, G. Nyamadzawo

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Section: Introductionmentioning

confidence: 99%

Residual effects of fallows on selected soil hydraulic properties in a kaolinitic soil subjected to conventional tillage (CT) and no tillage (NT)

2007

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“…27-39). Higher values for c 8 were also calculated for Eye-Dashwa granite samples (1 to 2 × 10 −6 /year (Gascoyne and Schwarcz 1986 [DIRS 164720], pp. 75-85)).…”

Section: Comparisons Of Water-rock Environmentsmentioning

confidence: 92%

“…In six monitoring boreholes (Boreholes 1, 2,6,7,8, located above the slot, changes in saturation and water potential were continuously recorded during the entire investigation. Changes in saturation along boreholes were measured with ERPs located at 0.25-m intervals along the 6.0-m-long boreholes.…”

Section: Borehole Monitoringmentioning

confidence: 99%

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In Situ Field Testing of Processes

Yang¹

2004

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“…This indicates that NaCl tracer as well as Brilliant Blue FCF is not a conservative tracer but is slightly absorbed and retarded by the soil. In the study of Andreini and Steenhuis [7], it is concluded that adsorption characteristics of Brilliant Blue FCF depend on soil particle size. The result obtained in this study concurs with this suggestion.…”

Section: Parameter Estimation In Homogeneous Flow Fieldmentioning

confidence: 99%

Transport parameter estimation in homogeneous and two-layered porous media using two different methods: genetic algorithm and image analysis

Inoue¹,

Masaki²,

Shimada³

et al. 2006

WIT Transactions on Ecology and the Environment, Vol 95

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Laboratory tracer experiments are conducted in homogeneous and two-layered flow fields under various hydraulic gradient conditions. NaCl solution dyed with Brilliant Blue FCF is used as a tracer in order to measure NaCl breakthrough curves and obtain images of dye tracer movement. Inverse analysis through genetic algorithm and image analysis are employed to estimate dispersivity, dispersion coefficient and retardation factor. The results show that dispersivity estimated from image analysis is about one order smaller than that of GA estimates. Moreover, it is revealed that tracer is slightly retarded relative to pore water velocity. As for parameter estimation in two-layered media, the values of equivalent dispersivity to the entire flow region exist between the values estimated in each layer. Estimated dispersivity in layered media depends on transport pathway of contaminant, suggesting the importance of observation location in parameter estimation problem.

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Preferential paths of flow under conventional and conservation tillage

Cited by 180 publications

References 8 publications

Residual effects of fallows on selected soil hydraulic properties in a kaolinitic soil subjected to conventional tillage (CT) and no tillage (NT)

Residual effects of fallows on selected soil hydraulic properties in a kaolinitic soil subjected to conventional tillage (CT) and no tillage (NT)

In Situ Field Testing of Processes

Transport parameter estimation in homogeneous and two-layered porous media using two different methods: genetic algorithm and image analysis

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