IRRIGATION EXPERIMENTS IN IDAHO. 9 
TaBLE I.—Precipitation, seasons of 1910, 1911, 1912, and 1913—Continued. 
SEASON OF 1912. 
Length] pr Bas Precipitation by months. P 
of j Motal | ate 
Locality. TCCOLG! | mamas ee —| for 6 nino 
Ja) An- |Apr.to Mont OS: Taal 
years. | nual Sept Apr. | May. | June. | July. | Aug. | Sept. : 
Inches .|Inches .| Inches .| Inches .| Inches .| Inches .| Inches .\Inches .| Inches. 
BOR@s 3.4586 eee oes Qo ribet ae LO} |i oud4 5 1s 94a ORSON al 271 | sO50%- 1s Old 8. 25 201 
Bula sSeeeeeee ae 5 | 10.90} 4.99} 1.92 43 90 18 08 .30 3.81 76 
Waldwell:,.-...----- Ga LOSO5 S| Re Ael3n pel 908 ey 2. Oor |main| Le22 5731 50 to til 187 
(Gooding ......----- 3 | 10.82 | 3.24 96) | 91533 67 noe | IN .18 3.47 107 
Idaho Falls.......-- A Las230 SS VOMLOE i Us94: |) ete 36 .89 | 1.60) 2.28 44 8.51 137 
Twin Falls.....-.-- 7} 11.98 | 4.13 1.68 . 63 . 46 .48 .16 .30 3.71 90 
Wendell......-...-- 4 13276 | -3282) |, 1.38 Oi . 86 104 ek. 31 3.16 83 
| 
SEASON OF 1913. 
POISON ys ee ees = 28y l2e7 4.10) 30895 | Ol587 "156454" 2501 | 0803" 1-- 0:65 5. 86 143 
Bilas Gea eee 6 | 11.25 | 5.25 .62 1.58 2.49 | 2.29 .13 05 7.16 136 
(OodIMg ==. ..2--.--. 4] 11.14} 3.04 47 eal 91 73 08 05 2.39 7 
Hollister..........- 2 | 12.97 | 6.74 .89 le 2.40 1.65 13 49 7.35 109 
Idaho Falls.......-- 18 | 14.35 | 6.19 sei) || Meek!) || PEC) eee .08 88 8.55 138 
Walleye... 2h. ke 19} 9.99] 4.89 ole On| non Ola |i Se . 84 65 7.86 156 
[EGQOROM 6 5 3b obSa GSE eee (Gewese) | aera |eeeama tes aL ay | me Sera Me Nl Ne i Neg) Wal b/c al listo oe 
piwan' Halls. 2... -. 8) 11.78 | 4.54 53 75 | 2.54 1.50 a1 2209 7.58 167 
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 
winter 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. 
