Details
| Original language | English |
|---|---|
| Pages (from-to) | 332-338 |
| Number of pages | 7 |
| Journal | Journal of Plant Nutrition and Soil Science |
| Volume | 165 |
| Issue number | 3 |
| Publication status | Published - 1 Jun 2002 |
Abstract
Preferential flow in soil can enhance the leaching of agricultural chemicals. In a number of studies it has been shown that the mobile-immobile solute transport model (MIM) is a useful tool to characterize preferential flow. In the present study, a new laboratory method for determining the MIM parameters θm and θim (mobile and immobile water content), as well as a (mass transfer coefficient), is developed. The computations are uncomplicated and the method requires only simple equipment. It is applied to short, undisturbed soil columns. Measured values ranged from 0.11 to 0,27 for θim θ-1 and from 0.015 h -1 to 0.034 h-1 for α for an Iowan soil (Nicollet silt loam). For two sandy Eutric Gleysols from Germany, low values for θim θ-1 from 0.04 to 0.07 and from 0.001 h-1 to 0.008 h-1 for α were determined. Although the new method is a flow-interruption technique, values for the Nicollet silt loam compare well with those from conventional leaching experiments. Values for the Eutric Gleysols agree with the observation that these soils were poorly structured. Because the new method does not assume negligible dispersion, it is applicable to a wider range of soils and boundary conditions than comparable approaches. We conclude that the new method provides parameter values that are suited to describe non-equilibrium solute transport.
Keywords
- Agrochemical leaching, Mass exchange coefficient, Mobile-immobile soil water, Preferential flow, Solute transport
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 165, No. 3, 01.06.2002, p. 332-338.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Laboratory method for determining immobile soil water content and mass exchange coefficient
AU - Ilsemann, Jan
AU - Van Der Ploeg, Rienk R.
AU - Horton, Robert
AU - Bachmann, Jörg
N1 - Copyright: Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2002/6/1
Y1 - 2002/6/1
N2 - Preferential flow in soil can enhance the leaching of agricultural chemicals. In a number of studies it has been shown that the mobile-immobile solute transport model (MIM) is a useful tool to characterize preferential flow. In the present study, a new laboratory method for determining the MIM parameters θm and θim (mobile and immobile water content), as well as a (mass transfer coefficient), is developed. The computations are uncomplicated and the method requires only simple equipment. It is applied to short, undisturbed soil columns. Measured values ranged from 0.11 to 0,27 for θim θ-1 and from 0.015 h -1 to 0.034 h-1 for α for an Iowan soil (Nicollet silt loam). For two sandy Eutric Gleysols from Germany, low values for θim θ-1 from 0.04 to 0.07 and from 0.001 h-1 to 0.008 h-1 for α were determined. Although the new method is a flow-interruption technique, values for the Nicollet silt loam compare well with those from conventional leaching experiments. Values for the Eutric Gleysols agree with the observation that these soils were poorly structured. Because the new method does not assume negligible dispersion, it is applicable to a wider range of soils and boundary conditions than comparable approaches. We conclude that the new method provides parameter values that are suited to describe non-equilibrium solute transport.
AB - Preferential flow in soil can enhance the leaching of agricultural chemicals. In a number of studies it has been shown that the mobile-immobile solute transport model (MIM) is a useful tool to characterize preferential flow. In the present study, a new laboratory method for determining the MIM parameters θm and θim (mobile and immobile water content), as well as a (mass transfer coefficient), is developed. The computations are uncomplicated and the method requires only simple equipment. It is applied to short, undisturbed soil columns. Measured values ranged from 0.11 to 0,27 for θim θ-1 and from 0.015 h -1 to 0.034 h-1 for α for an Iowan soil (Nicollet silt loam). For two sandy Eutric Gleysols from Germany, low values for θim θ-1 from 0.04 to 0.07 and from 0.001 h-1 to 0.008 h-1 for α were determined. Although the new method is a flow-interruption technique, values for the Nicollet silt loam compare well with those from conventional leaching experiments. Values for the Eutric Gleysols agree with the observation that these soils were poorly structured. Because the new method does not assume negligible dispersion, it is applicable to a wider range of soils and boundary conditions than comparable approaches. We conclude that the new method provides parameter values that are suited to describe non-equilibrium solute transport.
KW - Agrochemical leaching
KW - Mass exchange coefficient
KW - Mobile-immobile soil water
KW - Preferential flow
KW - Solute transport
UR - http://www.scopus.com/inward/record.url?scp=0141941687&partnerID=8YFLogxK
U2 - 10.1002/1522-2624(200206)165:3<332::AID-JPLN332>3.0.CO;2-M
DO - 10.1002/1522-2624(200206)165:3<332::AID-JPLN332>3.0.CO;2-M
M3 - Article
AN - SCOPUS:0141941687
VL - 165
SP - 332
EP - 338
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 3
ER -