NDLI: Effects of topography on the transport of agricultural chemicals to groundwater in a sand-plain setting

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Effects of topography on the transport of agricultural chemicals to groundwater in a sand-plain setting

Content Provider	Springer Nature Link
Author	Delin, Geoffrey N. Landon, Matthew K.
Copyright Year	2002
Abstract	Geochemical data were collected to investigate the effects of topography and focused recharge on the transport of agricultural chemicals to groundwater through sandy soils. The research was done at a topographically high (upland) site and a depressional (lowland) site within a corn field. Agricultural chemicals that move readily with water were most directly affected by focused recharge to the lowland site. Surface runoff of water to the lowland site was the primary cause for the generally greater flux of chloride, nitrate nitrogen, and sulfate compared with the upland site. Based on data from the unsaturated zone, for example, the average annual fluxes of these chemicals in 1992–1993 were 5.1, 3.4, and 1.7 times greater, respectively, at the lowland site. Study results indicate that consideration should be given to modifying site-specific management farming technology to account for varying recharge rates in different topographic settings. By reducing chemical application rates in topographic depressions, where focused recharge of chemicals occurs because of surface runoff, farmers could improve ground-water quality as well as reduce expenditures for agricultural chemicals.Des données géochimiques ont été recueillies dans le but d'analyser les effets de la topographie et de la recharge concentrée sur le transport des produits chimiques, utilisés en agriculture, vers les nappes au travers de sols sableux. Cette étude a été réalisée dans un secteur topographiquement élevé et dans un secteur en dépression, sur des cultures de blé. Les produits chimiques agricoles qui se déplacent facilement avec l'eau ont été le plus directement concernés par la recharge concentrée dans la zone déprimée. Le ruissellement de l'eau dans la zone déprimée a été la cause primaire du flux généralement plus important de chlorure, d'azote du nitrate et de sulfate par comparaison avec la zone élevée. En s'appuyant sur les données fournies par la zone non saturée, par exemple, les flux moyens annuels de ces substances en 1992–1993 ont été respectivement 5,1, 3,4 et 1,7 fois plus élevés dans le secteur en dépression. Les résultats de l'étude montrent qu'il faut prêter attention aux modifications des pratiques culturales de gestion de sites spécifiques en prenant en compte les taux variables de recharge selon les situations topographiques. En réduisant les taux d'application de substances chimiques dans les dépressions topographiques, où se produit la recharge concentrée des produits du fait du ruissellement, les agriculteurs peuvent améliorer la qualité des eaux souterraines tout en réduisant leurs dépenses pour ces produits.Se ha recogido datos geoquímicos para investigar los efectos de la topografía y de la recarga localizada en el transporte de compuestos químicos de origen agrícola a través de suelos arenosos hacia las aguas subterráneas. El estudio se ha llevado a cabo en dos emplazamientos situados en un campo de maíz; el primero, en un alto topográfico; el segundo, en una depresión. Los compuestos que se desplazan rápidamente con el agua son los más afectados por la recarga localizada hacia la depresión. La escorrentía superficial hacia ésta es la causa principal de un flujo mayor de cloruro, nitrógeno nítrico y sulfato que en el punto topográficamente elevado. Con base en los datos de la zona no saturada, por ejemplo, el promedio anual de flujo de los compuestos citados fue 5,1; 3,4 y 1,7 veces mayor, respectivamente, en la depresión. Los resultados indican que se debería prestar atención a cualquier cambio en las tecnologías de gestión agrícola a la hora de evaluar modificaciones de las tasas de recarga en diferentes puntos topográficos. Reduciendo la aplicación de compuestos químicos en las depresiones, donde la recarga se acentúa por la escorrentía superficial, los agricultores podrían mejorar la calidad de las aguas subterráneas a la par que reducir los gastos en compuestos químicos.
Starting Page	443
Ending Page	454
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	10
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-05-22
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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Effects of topography on the transport of agricultural chemicals to groundwater in a sand-plain setting

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