IKEIGATION IN ISTORTHERlSr COLORADO. 



61 



water applied and the trend of the curves was governed by points 

 determined by taking the arithmetical average of the coordinates 



a 



3 

 U 



z 







< 



I 

 H 

 a 

 bi 



























\ 

























\ 

















































i 

























J 

























-^ 





























































5 8 10 12 Id 16 1 

 YIETLO IN -rOISS PER ACRC | 



Fig. 12. — Irrigation of sugar beets. Relation between the depth of water ap- 

 plied and the yield. 



of points within each half foot of depth. No satisfactory way was 

 found to weight the points to take care of the difference in the area 

 of the fields from which the 

 unit value was determined, and 

 for this reason the curves should 

 be consiclerecl only as very close 

 approximations of averages foi- 

 the valley. 



In Tables 9, 17 to 18, and 29 

 are given all the detailed records 

 of farm irrigation for the two 

 years of the investigation, with 

 footings which summarize the 

 data for each crop each year. 

 The averages in the footings 

 are true averages, involving 



k3 















' 











/ 























/ 



f 



















/ 



/ 



















L^ 



^ 



X 



/ 









i' 







^ 





















a«^ 





















































100 



200 300 



YIELD IN BUSHELS PER ACRE 



400 



Fig. 13. — Irrigation of potatoes. Rela- 

 tion between the depth of water ap- 

 plied and the yield. 



