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SUMMARY AND CONCWSIONS 1. Reclamation is necessary to obtain satisfactory crop yields from the saline-alkali soUs of the San Luis Valley. 2. The 1955 results indicate that yields of barley are increased by the addition of amendments and by water management consisting of sub-irrigation or a combinstion of sub-irrigation and Surface irrigation on the reclaimed saline-alkali soils. 3. Alfalfa yields i"rom the first cutting of alfalfa in the :1.956 season were influenced by poor stands obtained from plots which received fewer surface irrigations in 1955. 4. After reclamation is accomplished, it appears that water manage- ment is the most important factor in obtaining satisfactory crop yields. The sub-irrigated plots with high water tables have had consistently higher yields than plots with a lower water table since cropping began in 1952. 5. The addition of chemical amendments is effective in increasing crop yields 5 years after the original applications, particularly under the higher water table (sub-irrigated) condition. 6. Gypsum still appears to be the most effective and also the most economical amendment. 7. Amendments have aided and hastened reclamation of the saline- ~11""li soils but it appears from chemical anslyses, that reclama- . tion can be accomplished at a much slower rate by means of leach- ing alone. 8. The 2l acre-inch and 30 acre-inch originsl leachingsare approod.- mately equally effective on the 1955 barley yields. Higher first- cutting alfalfa yields were obtained from the 30 acre-inch leaching under sub-irrigated conditions. 9. The 1955 yield results show that some surface irrigation will in- crease yields of barley even under sub-irrigation. Except for the necessity for a late fall surface irrigation of established stands of alfalfa, suri"ace water applied during the growing season appears to be of little benefit to alfalfa when sub-irrigation is practiced. r. ,- r\ 1->0" ., l; '., ~'w'::;.... J -l8-