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3. Hanson, B., Schwankl, L., Grattan, S.R., Prichard, T., 1994. Drip irrigation for row crops. Water Management Handbook Series 93-05. University of California, Davis, CA.
4. Yield and water use efficiency of corn in response to lepa irrigation;Howell;Trans. ASAE,1995
5. Subsurface and surface microirrigation of corn-Southern High Plains;Howell;Trans. ASAE,1997