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<br />w <br />Ut <br />o <br />::.v <br /> <br />I. INTRODUCTION <br /> <br />Since publication of the 1977 Salinity Status Report, investigations <br />have continued concerning grazing by livestock and its effects on salin- <br />ity. Research findings associated with effects of grazing on salinity, <br />overlooked during the first years of the salinity study, have been <br />reviewed. Findings published since the printing of the 1977 Salinity <br />Status Report (3) have also been reviewed. Information pertinent to <br />the salinity problem on public lands has been abstracted and included in <br />~.his report~ The 1977 report concluded that a reduction in salinity <br />from rangelands could be achieved by adjusting the intensity and timing <br />of grazing. Suggested options for grazing management for salinity <br />control must be balanced by the decisionmaker with all other management <br />purposes and objectives. Maximum livestock production, wildlife objec- <br />tives, and a host of other multiple land use values must be considered <br />in selecting a grazing management program. Properly designed grazing <br />systems incorporating salinity control objectives can be effective in <br />controll ing salt concentrations in surface runoff. <br /> <br />Possible means of controlling salinity from diffuse surface and point <br />source groundwater are examined in this report and presented as examples <br />to aid in the evaluation of future projects. <br /> <br />This report addresses salinity originating in surface runoff and ground- <br />water from the public lands. An earlier analysis determined that sur- <br />face runoff from these lands yields approximately 8 percent of the total <br />salt load of the Upper Colorado River Basin. This compares with 7 per- <br />cent from lands administered by others, 38 percent from natural ground- <br />water sources, 41 percent from irrigation return flow, and 1 percent <br />from industrial and municipal sources. The remaining 5 percent were <br />unaccounted for and are well within the limits of error for these <br />calculations. <br /> <br />1 <br /> <br />, <br />