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0018~' SUMMARY Mr. Power stated, in summarizing the discussion, that people are our biggest unknown factor in increased irrigation efficiencies. He felt the consensus of the group was that an irrigator tends to pump water to a point where water no longer I imits his crop production. In terms of basic questions posed at the beginning of the seminar, the factors which may affect technology and management, Mr, Power indicated they broke down into three basic categories: 1. Pumping of the water from its source to the field, 2. The point of application in the field, and 3. Reduction in waste water. We could expect increased efficiencies as a result of metering or perhaps through legal means (such as taxing the water withdrawn) or through organized districts. Evapotranspiration takes place once water is applied. Losses from the soil amount to 30 percent, and from the plants, 70 percent. The plant directly uses only a very small fraction of its water uptake. We can expect greater plant water efficiencies from research. However, we must be cautious of the need for water to carry nutrients from the soil-root zone to the plant. We should be concerned with accumulation of salts in the plant-root zone and the need to overirrigate, to leach out salt accumulations, Mr, Power stated reduction in tail water requirements could be obtained from utilization of waste water through ponds or other collection devices. Also, the need exists for a better understanding of recharge, both artificial and recharge occurring from irrigation in federal project areas, In conclusion, Mr. Power summarized that we might expect irrigation efficiency to change from the current 50 percent to 75 percent in the next 25 years, That would mean a 25 percent decrease in the quantity of water diverted for comparable pro- duction per acre. 21.