Abstract:
:The purpose of this study was to determine the effect of PO on the sorption and transport of glyphosate [-(phosphonomethyl) glycine, GPS] in soils. The results of batch experiments indicated significant competition between PO and GPS in two different soils, with PO being preferentially sorbed. The 24-h Freundlich partitioning coefficients for GPS sorption were decreased by 50 to 60% with PO in solution. High sorptive capacities exhibited by soils in the presence of PO suggest the existence of both competitive and ion specific sites in either soil. Miscible displacement transport studies indicated limited effects of competition when GPS was applied in conjunction with or subsequent to pulses of PO. However, when a PO pulse was applied after the application of a GPS pulse, a secondary GPS breakthrough was observed where an additional 4% of the applied herbicide mass was recovered in the effluent solution. This is likely attributed to the PO-mediated displacement of GPS bound to competitive sites. These results are further emphasized by the distribution of residual herbicide in this column, with enrichment of mass at lower depths in the column and a corresponding decrease in GPS mass closer to the column surface. These results indicate that the timing of inorganic P fertilizers relative to GPS applications has a significant impact on the fate of the herbicide in soils. In particular, these findings suggest that GPS may be more liable to leaching in scenarios in which P fertilizers are applied after the application of GPS-based herbicidal formulations.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Padilla JT,Selim HMdoi
10.2134/jeq2018.06.0252subject
Has Abstractpub_date
2019-01-01 00:00:00pages
156-163issue
1eissn
0047-2425issn
1537-2537journal_volume
48pub_type
杂志文章abstract::Concentrated animal feeding operations are major sources of ammonia to the atmosphere. Control methods to reduce emissions include acidifying amendments, urease inhibitors, and absorbents. For beef cattle, decreasing crude protein (CP) in diets may be the most practical and cost-effective method to reduce ammonia emis...
journal_title:Journal of environmental quality
pub_type: 杂志文章
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pub_type: 杂志文章,评审
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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doi:10.2134/jeq2003.1523
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pub_type: 杂志文章
doi:10.2134/jeq2002.9540
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2005.0462
更新日期:2006-10-27 00:00:00
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pub_type: 杂志文章
doi:10.2134/jeq2016.04.0124
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2010.0253
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2001.3041143x
更新日期:2001-07-01 00:00:00
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2010.0315
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pub_type: 杂志文章
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
pub_type: 杂志文章
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
pub_type: 杂志文章
doi:10.2134/jeq2019.01.0012
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journal_title:Journal of environmental quality
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journal_title:Journal of environmental quality
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pub_type: 杂志文章
doi:10.2134/jeq2009.0509
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