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<br />N <br />W <br />C.Jl <br />Ui <br /> <br />TABLE III-4 <br /> <br />Deep Percolation <br />SCS Onfarm Improvement program <br />Well ton-Mohawk Irrigation and Drainage District <br /> <br /> Crop Year 1981 <br /> 8efore After Difference Savings <br />Crop Ac-Ft/Ac AC-Ft/Ac Ac-Ft/Ac Acres Ac-Ft <br />Alfalfa 9.84 7.13 2.71 3,611 9,786 <br />Wheat 3.49 2.53 0.96 5,143 4,937 <br />Cotton 5.56 3.72 1.84 8,298 15,262 <br />Be rmuda 5.44 4.07 1.37 571 782 <br />Lettuce 5.33 1.03 4.30 1,542 6,630 <br />Citrus 11.41 4.76 6.65 265 1,762 <br />Sorghum 3.49 ' 3.10 0.39 -BQ. 246 <br />TOTALS 20,060 39,495 <br /> <br />Title II - Grand Valley, Colorado <br /> <br />The Grand Valley area was the first USDA salinity control study completed in <br />December 1977. The report, 'Onfarm Program for Salinity Control' was <br />supplemented in March 1980 with 'Supplement No. I" covering irrigation <br />lateral improvements needed to support the onfarm program. <br /> <br />Staffing for necessary technical assistance was increased by SCS in 1981. <br />Four additional positions were added to the Grand Junction field office <br />bringi~g the total staff to 13. The additional staff was needed to service <br />the high demands for technical assistance generated by over 500 requests for <br />individual annual ACP cost-share practices. One staff position was added to <br />provide strictly onfarm followup assistance in the area of improving onfarm <br />irrigation water management operations and efficiencies after the salinity <br />control practices are installed. <br /> <br />TWO areas of technical assistance need further emphasis in the Grand Valley <br />project. The first area is more advanced planning of total irrigation <br />lateral systems and complete onfarm water management salinity control plans. <br />This would provide for a more orderly and systematic sequence of salinity <br />control practice installation. A second area of critical importance is <br />expanded efforts in working with individual onfarm operators on a <br />post-implementation followup irrigation water management program. After <br />practices are installed, the proper operation and management of the <br />irrigation water management system are vital for successful salinity control <br />results. Timing irrigation sets, maintaining and operating automated and <br />semiautomated equipment, and proper treatment and repair of installed <br /> <br />13 <br />