||Evaluation and Functional Operation of Irrigation Systems.
Bros, Delvin D. ;
Wiersm, John L. ;
||South Dakota State Univ., Brookings.
||DI-14-01-001-1862; OWRR-A-017-SDAK; 03532,; A-017-SDAK(1)
( Surface irrigation ;
Water consumption ;
Soil water ;
South Dakota ;
Irrigation scheduling ;
Cut-back furrow irrigation
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
A procedure was developed whereby irrigators could use weekly mean values of daily evapotranspiration to schedule irrigations and to determine the quantity of water to apply. The weekly mean values of daily evapotranspiration were calculated for corn and alfalfa crops in South Dakota on an area basis using the Jensen and Haise potential evapotranspiration equation. Daily soil moisture balance was estimated, using the calculated values, for irrigated fields on several farms by a water balance technique. The soil moisture balance estimates were compared against actual soil moisture balance measurements. The comparisons indicate that the calculated weekly mean values of daily evapotranspiration are reliable and reasonably accurate for soil moisture level estimation. (Author)