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Task 2, Subtask 3: Irrigated systems

Executive Summary 
We propose to develop our knowledge about how BMPs related to irrigation and drainage impact soil C by using a two-tiered approach integrating detailed site-level measurements with regional-level investigations of physical and economic impacts of BMP's.



 Water management - irrigation and drainage - are crucially important for maintenance of agricultural production and, managed properly, may lead to C sequestration. Though both irrigation and drainage are widespread little is known about impacts on C sequestration. Some research has demonstrated that irrigation can lead to C storage in drier areas to the point that C inputs to the soil and C stocks exceed those under native conditions. But, though 16% of US cropland is irrigated, little is known about the impacts of irrigation and crop rotation, tillage, and N fertilization on soil C. Likewise, subsurface drainage is used to enhance productivity on 14 million ha of US cropland and can impact C stocks by influencing C inputs (by affecting yields) and C outputs through impacts on decomposition. In the humid region of the eastern corn belt successful adoption of reduced or no-till has been linked with increased spatial intensity of subsurface tile drains. We propose to develop our knowledge about how BMPs related to irrigation and drainage impact soil C. We plan to use a two-tiered approach integrating detailed site-level measurements with regional-level investigations of physical and economic impacts of various BMPs. This approach will enable us to generate detailed assessments of the physical benefits from specific BMPs at three widely distributed sites and will also generate information on edaphic and climatically driven variability in soil C responses to water management. Work from this subtask will contribute to our knowledge base on C sequestration rates for BMPs across three states with substantial areas under irrigation. Farmer adoption of BMPs is dependent on both the economic costs associated with adoption as well as their physical and economic benefits, in addition to other factors. A combination of farm budgeting and econometric models of adoption will be used to identify the economic consequences of adopting alternative BMPs and their likely adoption rates. Energy conversion factors will be applied to activities that use fossil fuels in an attempt to move toward full GHG accounting of management changes. Finally, results from this work will further our understanding of on- and off-site environmental co-benefits.

Participants:
  • Kling, C.  Iowa State University
  • Williams, J.  Kansas State University
  • McVay, K.  Kansas State University
  • Mutch, D.  Michigan State University
  • Vanderpool, C.  Michigan State University
  • Miller, P.  Montana State University
  • Mooney, S.  Montana State University
  • Walters, D.  University of Nebraska
  • Verma, S.  University of Nebraska
  • Lal, R.  Ohio State University
  • Sohngen, B.  Ohio State University
  • Rosenberg, N. J.  Pacific Northwest National Laboratory
  • Vyn, T.  Purdue University
  • Brouder, S.  Purdue University
  • Hons, F.  Texas A&M University
  • Zuberer, D.  Texas A&M University
  • Halverson, A.  USDA - ARS
 

     

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