Propisochlor retention and mobility in the presence of straw in Brazilian cropping systems

Non-ionic herbicides, such as propisochlor, are more easily retained in organic soil fractions. The presence of straw in tropical cropping systems can affect herbicide transposition to the underlying seed banks and their environmental behavior. The aim of this study was to evaluate propisochlor soil...

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Bibliographic Details
Published in:Archiv für Acker- und Pflanzenbau und Bodenkunde 2023-07, Vol.69 (9), p.1629-1644
Main Authors: Pereira, Natalia Salmazo, Munhoz-Garcia, Gustavo Vinícios, Takeshita, Vanessa, Pimpinato, Rodrigo Floriano, Tornisielo, Valdemar Luiz
Format: Article
Language:English
Subjects:
Contamination
Cropping systems
Environmental behavior
Environmental impact
Extreme weather
Groundwater pollution
Herbicides
Leaching
Non-ionic herbicide
Organic soils
pre-emergent
Rainfall
Retention
Seed banks
Seeds
Soil contamination
Soil profiles
Soil properties
sorption-desorption
Soybeans
Straw
Sugarcane
Transposition
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Summary:Non-ionic herbicides, such as propisochlor, are more easily retained in organic soil fractions. The presence of straw in tropical cropping systems can affect herbicide transposition to the underlying seed banks and their environmental behavior. The aim of this study was to evaluate propisochlor soil retention in the presence of soybean and sugarcane straw (0, 5 and 10 t ha −1 ) through radiometric techniques. Most of the applied 14 C-propisochlor was retained in the soil profile (18.2-39.4%) following an extreme rainfall simulation in the presence of straw. Decreased herbicide leaching was observed in the presence of sugarcane and soybean straw (0.7-0.5%), compared with soil without straw (1.8%). Hysteresis values ranged from 0.8 to 1.0, indicating that propisochlor sorption was reversible allowing for soil seed bank effects, as well as environmental dissipation. These findings indicate that propisochlor can overcome straw barriers, although representing low groundwater contamination risks. Because of this, reduced environmental impacts following the application of this herbicide are noted for tropical cropping systems containing straw mulch.
ISSN:0365-0340
1476-3567
DOI:10.1080/03650340.2022.2103674