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<br />N <br />CD <br />00 <br />-..J <br /> <br />PREFACE <br /> <br />This report is the first in a series of three reports <br />resulting from U.S. Environmental Protection Agency Grant No. <br />S-802985 entitled, "Implementation of Agricultural Salinity <br />Control Technology in Grand Valley." This report details the <br />experimental design and procedures used to collect data on sev- <br />eral types of on-farm improvements, field drainage, canal and <br />lateral linings and irrigation management practices (such as <br />irrigation scheduling) as salinity control measures. The second <br />report in this series is entitled, "Evaluation of Irrigation <br />Methods for Salinity Control in Grand Valley" and is concerned <br />with the evaluation of furrow, border, sprinkler, and trickle <br />irrigation as individual salinity control measures. The third <br />report of this series "Best Management Practices for Salinity <br />Control in Grand Valley" develops the methodology for determining <br />the cost-effectiyeness of individual salinity control measures <br />and a complete "package" of salinity control measures. <br /> <br />Another research project conducted in Grand Valley and <br />largely funded by the U.S. Environmental Protection Agency has <br />provided the necessary background in soil chemistry to support <br />the cost-effectiveness analysis in the above three reports. This <br />second project, "Irrigation Practices, Return Flow Salinity, and <br />Crop Yields," was supported by EPA Grant No. S-800687. Two <br />reports resulted from this effort. The first report, "Irrigation <br />Practices and Return Flow Salinity," focuses upon soil chemistry <br />modeling and the prediction of irrigation subsurface return <br />flow salinity. The second report, "Potential Effects of Irri- <br />gation Practices on Crop Yields in Grand Valley" focuses upon <br />the impact of various irrigation practices in determining crop <br />yields, with particular emphasis on maize and wheat. <br /> <br />Robert G. Evans <br />Wynn R. Walker <br />Gaylord V. Skogerboe <br />Charles W. Binder <br /> <br />iv <br /> <br /><.- "~' ..,,_;., ,"",,,ii ,.&h_~-"~ <br /> <br />