The impact of high-intensity no-till agriculture on groundwater quality in the subtropical Capiibary catchment, SE Paraguay

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• 作者：Georg J. Houben ; Alicia Eisenk?lbl ; Eduardo J. Dose…
• 关键词：No ; till agriculture ; Contamination ; Nitrate ; Pesticides ; Subtropical climate ; Paraguay
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：74
• 期：1
• 页码：479-491
• 全文大小：3,298 KB
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• 作者单位：Georg J. Houben (1)
  Alicia Eisenk?lbl (2)
  Eduardo J. Dose (2)
  Sofia Vera (3)
  
  1. Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655, Hannover, Germany
  2. Fundación Universitaria de Ciencias Agrarias (FUCAI), Hohenau, Paraguay
  3. Secretaria de Medio Ambiente (SEAM), Avenida Madame Lynch 3500, Asuncion, Paraguay
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

The Capiibary catchment, SE Paraguay, forms part of the Guarani Aquifer System and is intensively used for cashcrop agriculture (soy bean, wheat, maize), with two or more harvests per year. The aim of this study was to investigate the effects of no-till agriculture with frequent herbicide and fertilizer applications on groundwater quality under subtropical climate. Water samples taken from 81 wells showed rather low nutrient (e.g. nitrate) concentrations, probably due to the high humus content of the no-till soils and the prevalent climatic conditions which allow constant microbial recycling of nutrients. The denitrificaton potential of the aquifer is, however, small. Further analysis in seven wells showed no indication of pesticides in groundwater. This is probably attributable to a combination of the effects of no-till agriculture and the subtropical climate.