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פותח על ידי קלירמאש פתרונות בע"מ -
Leaching of herbicides through undisturbed cores of a structured clay soil.
Year:
1986
Authors :
גרסטל, זאב
;
.
Volume :
50
Co-Authors:
White, R.E.
Dyson, J.S.
Gerstl, Z.
Yaron, B.
Facilitators :
From page:
277
To page:
283
(
Total pages:
7
)
Abstract:
The leaching of the herbicides bromacil and napropamide through large undisturbed cores of a structured Evesham clay (Aquic Eutrochrept) was studied under continuous and discontinuous watering regimes and at different initial moisture contents. A greater proportion of both herbicides was leached from initially dry cores (Theta = 0.24) than from prewet cores (Theta = 0.35). This was consistent with differences in the amount of herbicide retained in the soil, most of which was retained in the top 0.05 m. Continuous leaching resulted in greater herbicide breakthrough than did the discontinuous treatment, presumably because some herbicide diffused from the conducting channels into the soil aggregates during the quiescent period, where it was less susceptible to subsequent leaching. At a continuous input rate of 12 mm h -1 to initially dry soil, 85% of the applied napropamide (K d = 17.7 L kg -1) and almost 100% of bromacil (K d = 1.73 L kg -1) were leached out of the soil by one pore volume of water. Chloride was used as a tracer for water flow through the soil. Chloride breakthrough curves were analyzed using a transfer function equation, which yielded the median travel time of a solute molecule in the soil. It is suggested that preferential flow of water down cracks and channels between soil aggregates led to short travel times and apparently low volumes of soil water participating in solute transport (Theta st). The Theta st values were inversely correlated with the percentages of the applied herbicides that were leached. -from Authors
Note:
Related Files :
Bromacil
Clay
HERBICIDES - Diffusion
Napropamide
Preferential flow
SOILS - Absorption
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
Language:
אנגלית
Editors' remarks:
ID:
23484
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:59
Scientific Publication
Leaching of herbicides through undisturbed cores of a structured clay soil.
50
White, R.E.
Dyson, J.S.
Gerstl, Z.
Yaron, B.
Leaching of herbicides through undisturbed cores of a structured clay soil.
The leaching of the herbicides bromacil and napropamide through large undisturbed cores of a structured Evesham clay (Aquic Eutrochrept) was studied under continuous and discontinuous watering regimes and at different initial moisture contents. A greater proportion of both herbicides was leached from initially dry cores (Theta = 0.24) than from prewet cores (Theta = 0.35). This was consistent with differences in the amount of herbicide retained in the soil, most of which was retained in the top 0.05 m. Continuous leaching resulted in greater herbicide breakthrough than did the discontinuous treatment, presumably because some herbicide diffused from the conducting channels into the soil aggregates during the quiescent period, where it was less susceptible to subsequent leaching. At a continuous input rate of 12 mm h -1 to initially dry soil, 85% of the applied napropamide (K d = 17.7 L kg -1) and almost 100% of bromacil (K d = 1.73 L kg -1) were leached out of the soil by one pore volume of water. Chloride was used as a tracer for water flow through the soil. Chloride breakthrough curves were analyzed using a transfer function equation, which yielded the median travel time of a solute molecule in the soil. It is suggested that preferential flow of water down cracks and channels between soil aggregates led to short travel times and apparently low volumes of soil water participating in solute transport (Theta st). The Theta st values were inversely correlated with the percentages of the applied herbicides that were leached. -from Authors
Scientific Publication
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