378 



THE IRRIGATION AGE. 



has been secured with three inches in a wet season 

 and six inches in a dry season. 



"Experiments have shown that the moisture 

 content of the soil and evaporation from a water 

 surface make very valuable guides as to the best 

 time to irrigate. Potatoes have made a maximum 

 yield where the irrigation was applied whenever 

 the moisture content dropped to 20 per cent in the 

 first foot of soil. With clover the most economical 

 returns were obtained when the moisture content 

 dropped to 15 per cent in the first two feet of soil. 



"Pumping with gasoline has proven somewhat 

 cheaper in fuel cost than electricity, yet the saving 

 in labor by electricity is more important than the 

 total fuel bll. The electric plant can also be made 

 to serve more acres and this lowers the overhead 

 cost per acre. 



"Using $1, which is our maximum total annual 

 cost per acre inch, corn has given an average profit 

 of $0.43 per acre inch; kale, $0.60; beets, $1.15; 

 alfalfa, $1.65; clover, $2.71; beans, $2.79; carrots, 

 $6.83, and potatoes, $7.75 per acre inch of water 



applied. The mean profit per acre inch as an aver- 

 age of all crops and including nearly 150 trials, has 

 been $2.66. The average increase in yield by crops 

 has been 53 per cent and the average depth of irri- 

 gation per season 504 inches." 



AVOID TURKESTAN ALFALFA SEEDS 



A warning to alfalfa growers to avoid the use 

 of commercial Turkestan seed is contained in De- 

 partment Bulletin No. 138, of the U. S. Department 

 of Agriculture, which is shortly to be issued under 

 the title "Commercial Turkestan Alfalfa Seed." 

 Specialists of the department have been investigat- 

 ing the comparative merits of different kinds of 

 alfalfa seeds, and have reached the conclusion that 

 there is nothing to recommend the Turkestan va- 

 riety for general use in this country. Growers who 

 wish to avoid this variety can readily identify it by 

 the presence of Russian knapweed seeds. Their 

 chalky white color makes them especially con- 

 spicuous. 



IRRIGATION NOTES 



(Continued from Page 374) 



Letters received by the executive 

 board of the Washington Irrigation 

 Institute, the second annual session of 

 which is to be held in North Yakima 

 in December, indicate that there will 

 be a large attendance from every sec- 

 tion of the state. Governor Ernest 

 Lister, President Bryan of Washing- 

 ton state college, B. A. Etchberry of 

 the University of California and Don 

 M. Bart, government irrigation ex- 

 pert in Idaho, will speak. The pro- 

 gram for the three-day session, De- 

 cember 16, 17 and 18, calls for one day 

 on engineering problems in irrigation 

 work, one on irrigation farming and 

 one on legal problems, legislation and 

 future development. 



A proposition to irrigate the high 

 land on the flat not reached by the 

 Okanogan (Wash.) project, by con- 

 veying the water of Boulder creek into 

 the west fork of Salmon creek, thence 

 to Brown's lake, which they plan to 

 use as a reservoir, has been made and 

 a plan launched by H. S. Albertson, 

 S. T Sterling. Richard Malone and 

 others of Pogue. 



The feasibility of the project has 

 impressed itself on the sponsors, who 

 have solicited the aid of Manager 

 Calvin Casteel of the Okanogan proj- 

 ect with the hope that he may in turn 

 be able to interest and influence the 

 Reclamation Service. 



Work on all three of the United 

 States Reclamation Service pumping 

 plants in the lower Yakima valley in 

 Washington, including the Snipes 

 Mountain, the Grandview and the 

 Outlook, has been started. It is un- 

 derstood that $50,000 additional to the 

 $290,000 originally set aside for pump- 

 ing plants will be available. The lat- 

 ter sum would have allowed but two 

 of the three to be completed. 



(Continued on Page 379) 



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