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<br />7. 'Drip irrigaticin could be used for a number of crops but <br /> <br />N <br />0") <br />.... <br />N <br /> <br />the ~osts are substantial. Water with very high concentrations <br />'of TpScan be used,'OI\ lIl&I'\y crops with this system, but periodic <br />leac~ing would be necessary to remove, salts accumulated at the <br />lateral edges of the flow pattern. <br /> <br />8. ' kncreased irri.ation frequency with flood or furrow systems <br />to maintain optimally low oSJQtic plus matrix stresses is an <br />alternative to drip or sprinkler irrigation. This could be <br />faci~itated with ~isture measuring devices such as tensiometers <br />or by an irrigation scheduling service. <br /> <br />9. _eplacing citrus or other fruit root stocks which are sensi- <br />tiveito chloride or sodium ions with root stocks which do not <br /> <br />accutulate these ions as rapidly is another alternative rnanage- <br />mentjpossibility. <br /> <br />The ass~tions used in evaluating economic effects of salinity on <br /> <br /> <br />irrigat~d crops in the Lower Colorado River Basin are given below: <br /> <br />1. ~hebasis for dete~ning the direct salinity effect per <br /> <br />mall ~as Sun's 1972 study (Reference 13), which dealt directly <br /> <br />with ;measuring the effects of utilizing water of differing <br /> <br /> <br />diss~lved solids content on optimal irrigation scheduling prac- <br /> <br /> <br />tice~ and product mix in the Imperial Valley. In addition to <br /> <br />13 <br /> <br />), <br /> <br />, e:-: ~. <br /> <br />