No3-N and metolachlor concentrations in the soil water as affected by water table depth Sarwar, Tahir Kanwar, Rameshwar Kanwar, Rameshwar
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-17T05:49:50.000 2020-06-29T22:41:50Z 2020-06-29T22:41:50Z Mon Jan 01 00:00:00 UTC 1996 1996
dc.description.abstract <p>Experiments were conducted in lysimeters to study the effect of shallow water table (WT) depths on the transport of two commonly used agricultural chemicals, nitrate-N and metolachlor, to shallow groundwater. Groundwater samples were collected from 0.20-, 0.40-, and 0.60-m depths using suction tubes during the growing season. The results showed significant reductions in both nitrate-N and metolachlor concentrations in the groundwater by maintaining shallow WT depths. Lowest concentrations of nitrate-N and metolachlor in the groundwater were observed when WT were maintained at 0.15-m depth. Generally, nitrate-N concentrations were increased with the soil depth while metolachlor concentrations decreased with the sampling depth during the growing season. Analysis of drainage outflow data at the end of WT treatment period also provided the evidence of the effectiveness of shallow WTs in reducing chemicals losses to shallow groundwater systems. The results of this study indicated that nitrate-N and metolachlor concentrations in the drainage outflow were 54 and 45%, respectively, lower for the 0.15-m WT treatment than the 0.60-m WT treatment. Regression analysis showed a strong negative linear relationship between metolachlor concentration and days after planting (DAP). Soybean yield was significantly reduced with the rise in WT depth. Average soybean yield obtained for the 0.15-m WT depth was 42% lower than the 0.60-m WT depth. It can be concluded from the overall results of this study that shallow WTs can be used effectively to reduce the nitrate-N and metolachlor losses to the shallow groundwater.</p>
dc.description.comments <p>This article was published in Transactions of the ASAE 39(6): 2119–2129, doi:<a href="" target="_blank">10.13031/2013.27715</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1966
dc.identifier.contextkey 7838384
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/683
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:29:21 UTC 2022
dc.source.uri 10.13031/2013.2771
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Hydrology
dc.subject.disciplines Water Resource Management
dc.subject.keywords Agricultural chemicals
dc.subject.keywords Leaching
dc.subject.keywords Nitrate
dc.subject.keywords Groundwater
dc.title No3-N and metolachlor concentrations in the soil water as affected by water table depth
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5210e67e-b8da-4e17-be3f-843a09381196
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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