Transport of 14C-prosulfocarb through soil columns under different amendment, herbicide incubation and irrigation regimes.
Sci Total Environ
; 701: 134542, 2020 Jan 20.
Article
em En
| MEDLINE
| ID: mdl-31734489
ABSTRACT
This study sets out to evaluate the effect on the leaching of prosulfocarb through packed soil columns of applying green compost (GC) as an organic amendment (20% w/w), herbicide ageing over 28â¯days in the soil (incubation vs. no incubation), and two different irrigation regimes (saturated or saturated-unsaturated flows). Peak concentrations decreased after herbicide incubation in the columns for both unamended (S) and amended (Sâ¯+â¯GC) soils under both flow regimes. The leached amounts decreased when the herbicide was incubated for 28â¯days in S (2.1 and 1.9 times) and Sâ¯+â¯GC (2.9 and 1.6 times), under saturated or saturated-unsaturated flow, respectively. In the S columns, the total amounts retained (43.3%-60.8%) were lower than the ones obtained for the Sâ¯+â¯GC columns under saturated flow (77.4%-85.2%), suggesting a stronger interaction between the herbicide and the GC-amended soil. This behaviour was not observed under saturated-unsaturated flow, as the total amounts retained were similar in both the S and Sâ¯+â¯GC columns. Prosulfocarb was primarily retained in the first segment of the S (>28%) and Sâ¯+â¯GC (>43%) columns under all conditions. Incubation time did not greatly affect the herbicide retention, but it significantly increased the mineralized amount under saturated flow. The total balances of 14C-prosulfocarb were >73% and >80% in the S and Sâ¯+â¯GC columns, respectively, indicating that amendment decreased prosulfocarb loss by volatilization. Several factors, such as amendment, herbicide ageing and water flow, proved to be important for controlling the leaching of this herbicide through the soil profile.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article