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<br />THE EXf'EFllmEnTI!IL SITE <br /> <br />Research results at the U.S. Salinity Laboratory, Riverside, California, indicate that with <br />frequent irrigation, crops can tolerate higher salinity at the bottom of the root zone than <br />previously assumed permissible, without significantly reducing crop yield. Using frequent <br />irrigation concentrates the salt into a smaller volume of water, causing some of the salt to <br /> <br />precipitate. It therefore becomes immobilized in solid form deep in the soil profile. As a <br />consequence, the amount of salt in the return flow should be reduced as well as the <br />volume of drainage water. Reducing the volume of drainage should reduce flushing of the <br />saline aquifer and consequently dissolve less salt from the underlying shale. <br /> <br />Buried Irrilltion Pl.eline <br /> <br />Roadway <br /> <br />~~L <br /> <br />--~"', ' <br />""J!]~ I <br />" Q:: J <br />, _:.I <br />/~-""1 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />r---T---T- <br />, ' , <br /> <br />" I I Weather <br />I=:J ' dD5tatlon <br />I I ' <br />I"'''''''' ",,,,,,, I <br />I I ' <br />I S ~ I <br />I _ -- , <br />; ~ ~ I <br />I I <br />r----r----~~",,,, j ",,,,,,, <br />! ~I ~, i <br />! ~i ~! i <br />I " I ' <br />I ,I <br />! i !",,,,,,, i <br />i!~ i~ ~ i~ <br />"'I"" '"" 1- ,- <br />ii: I ii: ~ 1<1: <br /> <br />o <br /> <br />Suction <br />Lyslmeter <br />Vacuum <br />Extractor <br /> <br />= <br /> <br />D <br /> <br />Weilhing <br />Lysimeter <br /> <br />Salinity sensor <br />site. One each <br />at.5, 1 &2 <br />loot depths. <br /> <br />", <br /> <br />The experimental sitrJ is located below the <br /> <br />Highline Canal northeast of Fruita, Colorado. <br /> <br />Evapotranspiration (E T) plus leaching <br /> <br />percen tages 0, 5. and 15 represen t the <br /> <br />applications to the pie-shaped sections under the <br /> <br />center-pivot sprinkler sysmm to attain the <br /> <br />desired leaching percentages. The surface <br /> <br />irrigation system to the ~st (left) is treated <br /> <br />at leaching percentages of 10 and 20. <br /> <br /> <br />PlotS6 <br />ET+ 15%'" <br /> <br />f'lotSl <br />ET+ 0" <br /> <br />", <br /> <br />=0 <br /> <br />o~ <br />~ <br /> <br />", <br /> <br />=0 <br /> <br />o <br />0"'8 <br /> <br />", <br /> <br />i <br />, <br />I <br />b"b"b,,' <br />=1 <br />, <br />I <br />, <br />I <br /> <br />Plot 55 <br />ET+ 5$... <br /> <br />I <br />I <br />I <br />I <br />1 <br />I <br />I <br />I <br />, <br />I~ <br />Ii <br />I'" <br />----____.J <br />100 200 <br /> <br />Plot 52 <br />ET+ 5';" <br /> <br />", <br /> <br />", <br /> <br />=0 <br /> <br />"'''' <br />0= <br /> <br />PloIS4 <br />ET+O" <br /> <br />PlotS3 <br />ET+ 15'" <br /> <br />", <br /> <br />----R'oadW-;'y---- <br /> <br />o <br /> <br />"1!Kilcales amount 01 irription wallapplied in excess of crop evapotranspiration (ET) requirements. <br /> <br />Scale of Feet <br /> <br />1~6Z00 <br />