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<br /> <br />Yes, the leaching fraction, defined as the percentage of applied irrigation water that <br />passes through the root zone carrying the salts with it, must be maintained. However, if <br />research investigations show that the leaching fraction can be reduced, then the amount <br />of ground-water flow, and consequently the amount of salt returned to the river, can be <br />reduced. <br /> <br /> <br />WoUld you say 3, 10, maybe 30 percent must pass through the root zone to maintain a <br />favorable root environment? <br /> <br /> <br />€~6G 0 <br /> <br />ODJECTIlIE , ... <br /> <br />Objective 1 is to determine the feasibility of reducing drainage volume and <br />salt output through use of high frequency, low volume sprinkler irrigation <br />appli('ullons. This approach eliminates the need for excess water to <br />compensate for nonuniform infiltration. <br /> <br />Where infiltration is controlled by the irrigation system, rather than the soil, nonuniform <br />leaching is minimi7ed. Thus, it may be possible to reduce the leaching percentage to <br />about 3 percent instead of the estimated 30 to 40 percent. <br /> <br /> <br />~_/ <br /> <br /> <br />" <br /> <br />... to attain leaching percentages of 0, <br />5, and 15 percent over <br />experimental area. <br /> <br />Cen ter-pivo t irrigation system <br />installed in MaV 1973 provides <br />automatic control of applied water... <br /> <br />