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Agrochemical controlled-release and transport in the soil profile: I. Model formulation and sensitivity analysis for bare soil under field conditions
Year:
1997
Source of publication :
European Journal of Soil Science
Authors :
Friedman, Samuel
;
.
Volume :
48
Co-Authors:
Friedman, S.P., Institute of Soils and Water, ARO, Volcani Centre, Bet Dagan 50250, Israel
Facilitators :
From page:
523
To page:
533
(
Total pages:
11
)
Abstract:
The controlled release of agrochemicals from capsules, uniformly distributed in the soil, and their spread in the soil profile by diffusion and convection, coupled with first-order degradation, are studied theoretically. This transient transport is formulated mathematically as an approximate description of two simultaneous processes: (1) local release from the capsule, described as taking place in a confined, spherical soil domain, with a quasi-steady-state diffusional, spread in each time step and (2) the vertical spread of the released material in the soil profile, described by the convection-dispersion equation including a source term for the solute transport, coupled with the Richards' equation for the water flow. These processes of release, spread and degradation are simulated for realistic field conditions to study the effects of management practices and environmental conditions on the release rate. For a given amount of chemical per unit area, the rate of release increases with increasing number of capsules and with increasing depth of incorporation. Increasing irrigation intensity also enhances the release rate, as well as increasing the time interval between irrigations for the same seasonal amount of water applied. Under a given irrigation regime and incorporation practice, the rate of release increases progressively from coarse to fine-textured soils. The amount of released agrochemical remaining in the target zone after a certain time is compared with the amounts of a similar non-encapsulated agrochemical and of an inert tracer retained in the soil. The encapsulated material always persists longer, to an extent depending on the above-mentioned conditions.
Note:
Related Files :
agricultural soil
bare soil
chemical release
chemical transport
Sensitivity analysis
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19414
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:28
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Scientific Publication
Agrochemical controlled-release and transport in the soil profile: I. Model formulation and sensitivity analysis for bare soil under field conditions
48
Friedman, S.P., Institute of Soils and Water, ARO, Volcani Centre, Bet Dagan 50250, Israel
Agrochemical controlled-release and transport in the soil profile: I. Model formulation and sensitivity analysis for bare soil under field conditions
The controlled release of agrochemicals from capsules, uniformly distributed in the soil, and their spread in the soil profile by diffusion and convection, coupled with first-order degradation, are studied theoretically. This transient transport is formulated mathematically as an approximate description of two simultaneous processes: (1) local release from the capsule, described as taking place in a confined, spherical soil domain, with a quasi-steady-state diffusional, spread in each time step and (2) the vertical spread of the released material in the soil profile, described by the convection-dispersion equation including a source term for the solute transport, coupled with the Richards' equation for the water flow. These processes of release, spread and degradation are simulated for realistic field conditions to study the effects of management practices and environmental conditions on the release rate. For a given amount of chemical per unit area, the rate of release increases with increasing number of capsules and with increasing depth of incorporation. Increasing irrigation intensity also enhances the release rate, as well as increasing the time interval between irrigations for the same seasonal amount of water applied. Under a given irrigation regime and incorporation practice, the rate of release increases progressively from coarse to fine-textured soils. The amount of released agrochemical remaining in the target zone after a certain time is compared with the amounts of a similar non-encapsulated agrochemical and of an inert tracer retained in the soil. The encapsulated material always persists longer, to an extent depending on the above-mentioned conditions.
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