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<br />N <br />C~ <br />t-.:. <br />W <br /> <br />USEOF SALINE DRAINAGE WATER FOR IRRIGATION <br /> <br />can be enhanced if a dual rotation (crop and water) system of management is <br />used. In this management system saline water is substituted for low-salinity <br />irrigation water without significant yield reduction, loss in cropping flexibility, <br />or change in current farming operations at certain times during the crap ro- <br />tation. Salt-sensitive crops (lettuce, alfalfa, etc.) in the rotation are irrigated <br />with low-salinity water while saline water is applied to the salt-tolerant crops <br />(cotton, sugarbeets, wheat, etc.). For the tolerant crops, the switch to saline <br />water usually occurs after seedling establishment; preplant and initial irriga- <br />tions are made with low salinity water. This strategy is verified by data from <br />the field experiment. A way to operate the strategy so that the drainage water <br />salinity does not increase in time and eventually terminate the re-use is dis- <br />cussed in another paper (Rhoades, 1989). An alternative strategy often advo- <br />cated to facilitate the use of saline waters for irrigation is to blend them with <br />water of low salinity before use. A comparison of these two strategies (cyclic <br />use versus blending) is also discussed by Rhoades (1989). <br /> <br />REFERENCES <br /> <br />Ayers, A.D., Brown, J.W. and Wadleigh, C.H., 1952. Salt tolerance of barley and wheat in Boil <br />plots receiving salinization regimes. Agron. J., 44: 307-310. <br />Bresler, E., 1987. Application of 8 conceptual model to irrigation water requirement and salt tol- <br />erance of crops. Soil Sci. Soc. Am. J., 51: 788-793. <br />Bressler, M.B., 1979. The use of saline water for irrigation in the U.S.S.R. Joint Commission on <br />Scientific and Technical Cooperation, Water Resources. <br />Bernstein, L., 1966. Reuse of agricultural waste waters for irrigation in relation to the salt toler- <br />ance of crop9. In: L.D. Doneen (Editor), Agricultural Waste Waters, Rep. No. 10, Water Re- <br />sources Center, pp. 185-189. <br />Boyko, H., 1967. Saltwater agriculture. Sci. Am., 26(3): 89-96. <br />Dhir, R.D., 1976. Investigations into use of highly saline waters in an arid environment. Salinity <br />and alkali hazard conditions in soil under a cyclic management system. In: H.E. Dregne (Ed- <br />itor), Proc.lnt. Saliility Conf. Managing Saline Water for Irrigation. Texas Tech. Univ., Lub- <br />bock, TX, Aug. 1976, pp. 608-609. <br />Dinar, A., Knapp, K.C. and Rhoades, J.D., 1986. Production function for cotton with dated irri- <br />gation Quaritities and Qualities. Water Resour. ReB., 22: 1519-1525. <br />Epstein, E. and Norlyn, ;J.D., 1977. Seawater-based crop production: A feasibility study. Science, <br />197: 247-25J: <br />Frenkel, H. and Shainberg, I., 1975. Irrigation with brackiBh water: Chemical and hydraulic changes <br />in soils irrigated with brackish water under cotton production. In: Irrigation with Brackish <br />Water, Int. Symp., Beer-Sheva, IBrael. The Negev University Press, pp. 175-183. <br />Hardan, A., 1976. Irrigation with saline water under desert conditions. In: H.E. Dregne (Editor), <br />Proc. Int. Salinity Conf., Managing Saline Water for Irrigation. Texas Tech. Univ., Lubbock, <br />Aug. 1976, pp. 165-169. <br />Ingvalson, R.D., Rhoades, J.D. and Page, A.L., 1976. Correlation of alfalfa yield with various <br />indices of Balinity. Soil Sci., 122: 145-153. <br />Jury, W.A., Frenkel, H., Fluhler, H., Devitt, D. and Stolzy, L.H., 1978. Use of Baliile irrigation <br />waters and minimal leaching for crop production. Hilgardia, 46(5): 169-192. <br />Keren, R. and Shainberg, I., 1978. 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