Journal of Agricultural Research 



Vol. XIII, No. I 



Table II. — Number of irrigations per season and ike average depths of water applied 

 at each irrigation and retained by the upper 6 feet of soil for 15 typical alfalfa farms 

 in Sacramento Valley, California, 1913, 1914, and retained by the upper 5 feet of soil 

 on Willows experimental plot, 191 5 



Class of soil and name of field. 



Silt-loam soils having 

 fine sandy- loam 

 sub-soils: 



Wigno 



Griffes 



Average . 



Silt-loam soils: 



Bundy 



Beck 



Hofhenke . . . 



Average . 



Silt-loam soils not in- 

 cluded in above 

 group because of 

 special conditions: 



Hughson 



Huartson 



Williams c 



Clay-loam soils: 



O'Hair 



Geer 



Guile 



Jackson-Woodard .... 



Wright 



Average . 



Clay soils: 

 Purdy. . 

 Tuttle . . 



Average , 



Location. 



Los Molinos. 

 Woodland . . 



Num- 

 ber of 

 irriga- 

 tions 

 per 

 season. 



Los Molinos. 

 Woodland . . 

 Los Molinos. 



Woodland . 

 Gridley . . 

 do. . . 



Orland 



Los Molinos. 

 Woodland . . 

 do 



Dixon . 



Willows . 

 do.. 



Clay soils, Willows ex- 

 perimental tract:/ 



Plots 3 and 4 



Plots 6 and 7 



Plots II and 12 



Average . 



Average 

 depths of 

 water 

 applied 

 per irri- 

 gation. 



Inches. 

 18. 25 

 II. 78 



15.02 



12.30 



9- 52 

 16. 62 



12.81 



39-50 

 &7. 20 



4. 16 



19-67 



6.61 



8.04 



5-44 



8. 78 



5. 06 

 4-38 



4. 72 



Quan- 

 tity of 

 water 



re- 

 tained 



by 

 upper 

 6 feet 

 of soil. 



Inches. 

 4.89 



5- 14 



5-52 



4-03 

 4. 19 



4-51 



4. 24 



8. 20 

 4. 19 

 2. 76 



2. 65 



4- 50 

 4. 70 



3-33 

 2.31 



Quan- 

 tity of 

 water 



re- 

 tained, 

 includ- 

 ing 

 prob- 

 able 

 evapo- 

 ration 

 loss. 



Per- 

 centage 



Per 



centage 

 of aver- 

 age tained, 

 amountl in- 

 applied 



Inches. 

 5-97 



6.60 



"36. 8 



5-" 

 5-27 

 5-59 



5-32 



9. 28 

 5-27 

 3-84 



3-73 

 5-58 

 5-78 

 4. 41 



3-39 



3- 50 4- 56 



1.58 

 2-93 



re- 

 tained 



by 6 

 feet of 



soil. 



26.8 

 52.1 



32-5 

 44.0 



'Z?,- I 



«39-8 



eluding 

 prob- 

 able 

 evap> 

 ration 

 loss. 



2.56 



4. 01 



28 



046.8 



I. 62 



2-15 



2.65 



2. 14 



29. 2 

 66.9 



27. O 



35- 7 

 26. 2 



028. 9 



32.7 

 61. 4 



43-9 



41. 6 

 55-3 

 33- (> 



41- S 



52.0 



50. 6 

 91. 4 



69.4 



Si. o 

 71.7 

 44. I 



58-3 



<» Averages determined by giving percentages weights proportionate to the amount of water applied. 



6 Sampled only for last three irrigations. 



e Moisture determinations made to depth of only 3 feet. 



d Sampled only for three irrigations. 



< Sampled only for last two irrigations. 



/ Moisture determinations made to depth of only s feet. 



