DETERMINATION OF CROP PRODUCTION LOSS DUE TO INADEQUATE DRAINAGE IN A LARGE WATERSHED1 |
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| Authors: | R S Kanwar H P Johnson T E Fenton |
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| Institution: | 1. Assistant Professor, Department of Agricultural Engineering, Ames, Iowa 50011.;2. Professor and Head, Department of Agricultural Engineering, Ames, Iowa 50011.;3. Professor of Agronomy, Iowa State University, Ames, Iowa 50011. |
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| Abstract: | ABSTRACT Results of a field survey designed to assess the extent of crop production losses due to inadequate drainage in a large watershed of Iowa is presented. Information on the current status of drainage of the watershed, located in the Des Moines River basin, was collected through personal interviews with 256 farmers from 60 legal drainage districts. The results of the survey indicate that 95 percent of the area in upper Des Moines River basin has inadequate district mains or main outlet drains currently having a design capacity of ≤ 0.64 cm/day drainage coefficient. Outlet capacity of 1.27 cm/day d.c. would be required for full production. Inadequate drainage in the watershed is currently responsible for crop yield reduction equal to about one-third of the maximum yield potential for average weather conditions. |
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| Keywords: | watershed inadequate drainage drainage districts soil mapping units crop production potential crop production loss |
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