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<br />,'" <br /> <br />. <br />. . <br /> <br />moisture is 50 percent deplet'ed in the first four feet. One-half <br />of the 60" beddings wIl} receive an equal, arryou'nt and the other <br />half of the 60" beds will receive one-half as much water. One-half <br />of the 80" beds wi 11 ~ece; ve '3/4 as much as the norma I water i ngs <br />and the other haif, 3/8 as much. This we hope, will give us an <br />indication at least of the value of wide-spac~ watering in <br />reducing excess water'use', <br /> <br />Another test at the station' involving irrigation was use is be- <br />, ' '.' <br />ing conducted for Iris~ Potatoes ~t three 'irrigating lev~ls. Pre- <br />irrigation only--second irrigating when the avaiiable 501,1 moisture <br />is deple'ted to 25 percent and 'a thi rd level of i rrigat'ing when the <br />available soil moisture is depleted 'to 50 pe'rcent. This test. <br />also involves interrelations among three varieties with d;"fferent <br />maturities and four ferti'1 izer level's. ' <br /> <br />',' <br /> <br />We hope in the near,fu~ure to initiate an irrigation-ferti~ity <br />study for wheat, corn and sugar beets at different levels of, <br />irrigation and fertil izers in cooperation with the Bureau of <br />Reclamation. The test is still in the discussion stage. We <br />presently are conducting a moisture-use study on grain sorghums <br />which involves different water treatments and plant spacing, <br /> <br />Pre-irrigation + <br />Pre-irrigation + <br />Pre-irrigation + <br />September <br />Pre-irrigation <br /> <br />July <br />July <br />July <br /> <br />& August <br />& August & <br /> <br />Pre-l~rigation + August & <br />S'eptember <br />Pre-irrigation + September <br />Spacings 3-6-12" apart <br />30" rows for each <br /> <br />Pre-irrigation only <br /> <br />+ August <br /> <br />Main treatment <br /> <br />Increased efficiencies in use of, irrigation ~ater pumped will come <br />about secondly by more effective use of tai,] water. In 1967, we <br />measured through a flow meter' the excess runoff or' ta i I water from <br />a 35-acre field, and found about 5 percent runoff in' addition to <br />water lost from deep penetration and evaporation while accumulating <br />overnight. ' <br /> <br />", <br /> <br />In 1968, on the same fie I,d, we had, '16,5 percent ta i 1 'water <br />measured, We rea Ii ze a ce'rta j:n amount excess is necessary for <br />good irrigation of crop~ at t'he lower end. Bu't it is noteworthy <br />that the marked variation, between the two years was due; for'the <br />most part, I bel ieve, to different persons',irri'gati~g',each year <br />(or differences in management),.' ' <br /> <br />In ,the future, more recovery pits or systems that reci rculilte, <br />water into the mai'n underground pipelines, or possible new tech- <br />niques yet to be discovered, will be used to get more of the <br />excess water into crop production rather than losing it to evaporation, <br />streams, etc, If'our figures taken to date are. reasonably represent- <br />ative, we should expect to sa~e around'8 to 10 percent of the water <br />pumped, which is now lost. <br /> <br />10. <br /> <br />" <br />