IRRIGATION EXPERIMENTS IN IDAHO. 



Tablk I. Precipitation, seasons of 1910, 1911, 1912, and 1918 Continued. 



SEASON OF 1912. 



Locality. 



Length 

 of 



record 



in 



years. 



Average 

 precipitai ion. 



Precipitation by muni h 



Total 



for (i 



moil! Ii ;. 



Per 

 cent 



An- 

 nual. 



Apr. to 

 Sept. 



Apr. 



May. 



June. 



July. 



Aug. 



Sept. 



of nor- 

 mal. 





27 

 5 

 7 

 3 



17 

 7 

 4 



Inches . 

 12.71 

 10.90 

 10.05 

 10. 82 

 14. 2.5 

 11.98' 

 13. 76 



Inches . 

 4.10 

 4.99 

 4.13 

 3.24 

 (i. 19 

 4.13 

 3.82 



Inches . 

 3.34 

 1.92 

 1.96 

 .90 

 1.94 

 1.68 

 1.38 



Inches . 



1.94 



.43 



2.05 



1.33 



1.36 



.63 



.57 



Inches . 



0. 86 

 .90 



1.77 

 .07 

 .89 

 .4(5 

 .86 



Inches . 

 1.27 



.18 

 1.22 



.33 

 1. 00 



.48 



.04 



Inches . 



0.07 

 .08 

 .21 



T. 



2.28 

 .16 



T. 



Inches . 

 0.77 

 .30 

 .50 

 .18 

 .44 

 .30 

 .31 



Inches. 

 8.25 

 3.81 

 7.71 

 3.47 

 8.51 

 3.71 

 3. 16 



201 



Buhl... 



70 



Caldwell 



1 tooding 



[daho Kails 



187 



107 

 137 



'ruin Falls 



Wendell 



90 



■S3 



SEASON OF 1913. 





28 

 6 

 4 

 2 

 18 

 19 



12.71 

 11.25 

 11.14 

 12.97 

 14.35 

 9.99 



4.10 

 5.25 

 3.04 

 6.74 

 6.19 

 4.89 



0.95 

 .62 



.47 

 .89 

 .35 

 .15 



0.58 

 1.58 



.15 

 1.-79 

 2.39 

 1.30 

 1.25 



.75 



1.04 

 2.49 

 .91 

 2.40 

 2.99 

 3.01 

 4.32 

 2.54 



2.01 

 2.29 

 .73 

 1.65 

 1.86 

 1.85 

 1.29 

 1.50 



0.03 

 .13 



.08 

 .13 

 .08 

 .84 

 1.17 

 .17 



0.65 

 .05 

 .05 



.49 

 .88 

 .65. 



5.86 

 7.10 

 2.39 

 7.35 

 8.55 

 7.80 



143 



Buhl 



136 



Gooding 



79 

 109 



Idaho Falls 



138 



Oakley 



156 



Twin Falls 



8 



11.78 



4.54 



.53 



2.09 



7.58 



107 







RESULTS OBTAINED DURING 1910, 1911, 1912, AND 1913. 



Tables II to VIII show in condensed form the principal results 

 secured from the most of the experiments. It was evident that soils 

 and crops differed so widely in their irrigation requirements that 

 comparisons could be made only by grouping the data according to 

 soils and crops. The crops are therefore segregated in two groups 

 in the tables, according to their water requirements: (1) Spring and 

 whiter grains, potatoes, and orchard; (2) alfalfa, clover, and pasture. 

 For convenience, the results from the three or more plots on each 

 farm are grouped together so that the experiments on the different 

 farms are separated slightly in the tables. The total depth applied 

 includes only the irrigation water that was retained upon the tract in 

 question, the rainfall during the growing season being given in 

 another column. 



