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<br />l <br /> <br />.,"~ <br />~~~;; <br /> <br />.... <br />.... <br />CJ1 <br />.... <br /> <br />on-farm systems and management are improved, irrigat~on scheduling <br />alone will have very little effect in deep percolation reduction. <br />It appears that too much emphasis has been placed oni the Bureau's <br />IMS and Water Systems Improvement programs and too little on on-farm <br />improvements. <br /> <br />~: Additional information on on farm improvements have been added <br />rn-chapter I, section B.3.c. Irrigation Source Control. We agree that <br />the on farm improvements could have been covered more thoroughly. We <br />also hope to emphasize the IMS program in actual practice because <br />without it, the program would probably not succeed. <br /> <br />8. Comment: The work of the Agricultural Research Service on the <br />practicality of precipitating salts from irrigation water in the soil <br />should be included. <br /> <br />Reply: A reference to ARS research work has been added as suggested. <br />See chapter I, section C.S. Irrigation Efficiency Studies. <br /> <br />9. Comment: Page 1-28, last paragraph. - It appears that the last <br />paragraph ,intended to eliminate cation exchange from large-scale <br />studies. This should be clarified. <br /> <br />~;;~~~r$ <br /> <br />~~: The last paragraph does not intend to explain the specifics <br />~e ion exchange process. Additional details on process limita- <br />tions will be presented in future reports. <br /> <br />10. Comment: Page 1-30, paragraph 4. - We believe the information <br />concerning the SCS on this page is inadequate and should be revised <br />to read as follows: "Since the middle 1930's the Soil Conservation <br />Service has been assisting landowners in controlling soil erosion and <br />managing their water resources. This assistance includes co~serva- <br />tion planning and application of conservation practices, including <br />irrigation practices to improve on-farm irrigation efficiencies. In <br />recent years, on-farm irrigation improvements have been emphasized as <br />an important method of reducing salt contribution to the river from <br />irrigated land." Also, there is little mention of the extensive Agri- <br />cultural Research Service Program being conducted at Grand Valley, <br />Colorado, on irrigation and salinity management. <br /> <br />Reply: The suggested revision has been accommodated in the text as <br />requested. See chapter I, section C.S. Irrigation Efficiency Studies. <br /> <br /><~f~;~ <br /> <br />16 <br />