8 



BULLETIN 1004, XJ. S. DEPARTMENT OF AGRICULTURE. 



water in the soil will be reduced by the required difference. This is 

 perhaps best shown by correlations. 



Table 1. — Average daily precipitation, evaporation, and rate of use of water oy 

 the wheat crop, together with yields per acre, on plats A and G or D during 

 a designated period of rapid growth at the several experiment stations for 

 the years shown. 





Period. 



Pre- 

 cipita- 

 tion. 



Evap- 

 ora- 

 tion. 



Plat A. 



PlatC 



orD. 



Station and year. 



From — 



To— 



Water 

 use. 



Yield. 



Water 

 use. 



Yield. 



Huntley: 



1913 



June 11 

 June 13 

 June 19 



June 8 

 June 12 

 July 2 

 May 29 



June 2 

 June 3 

 June 4 

 June 3 

 June 11 



June 29 

 July 7 



July 1 

 June 3 

 June 2 

 June 2 

 June 5 

 June 7 

 June 20 

 June 23 

 June 11 

 June 9 



May 29 

 June 21 

 June 10 



May 27 



June 5 

 June 2 

 June 18 

 June 10 

 June 25 

 June 10 

 June 9 

 June 5 



June 19 



May 18 

 June 7 



June 3 

 June 4 

 June 4 

 June 9 



June 28 

 June 4 



June 9 

 June 2 

 May 25 

 June 4 

 June 28 



May 28 



May 22 

 May 21 



June 28 

 June 27 

 Aug. 7 



June 24 

 July 29 

 July 27 

 July 12 



July 22 

 Aug. 5 

 July 19 

 June 16 

 Aug. 28 



Aug. 23 

 Aug. 8 



July 16 

 July 8 

 July 19 

 June 22 

 June 26 

 July 2 

 July 29 

 July 29 

 Aug. 13 

 July 29 



June 26 

 July 9 

 July 23 

 July 5 



Aug. 3 

 June 16 

 July 2 

 June 27 

 Aug. 5 

 July 12 

 July 9 

 June 24 



July 29 



June 18 

 July 6 



Aug. 5 

 Aug. 2 

 Aug. 11 

 July 20 



July 28 

 July 17 



June 30 

 July 28 

 June 21 

 July 6 

 Aug. 12 



June 25 



June 22 

 June 13 



Inches . 



0.11 



.14 



.08 



.04 

 .10 

 .07 

 .07 



.09 

 .08 

 .08 

 .05 

 .11 



.12 

 .11 



.11 



.06 

 .06 

 .08 

 .03 

 .15 

 .11 

 .12 

 .13 

 .10 



.04 

 .13 



.21 

 .08 



.13 

 .04 

 .09 

 .06 

 .16 

 .08 

 .02 

 .01 



.06 



.06 

 .04 



.15 

 .17 

 .17 

 .08 



.04 

 .02 



.07 

 .12 

 .05 

 .11 

 .10 



.12 



.22 

 .05 



Inches. 



0.20 



.18 



.18 



.25 

 .20 

 .24 

 .21 



.22 

 .17 

 .26 

 .22 

 .16 



.18 

 .23 



.19 

 .18 

 .14 

 .21 

 .24 

 .16 

 .19 

 .21 

 .15 

 .16 



.20 

 .25 

 .16 

 .16 



.23 

 .25 

 .22 



.24 

 .18 

 .20 

 .27 

 .23 



.27 



.25 

 ■ .30 



.24 

 .24 

 .21 

 .29 



.21 

 .26 



.29 

 .27 

 .31 

 .23 

 .21 



.29 



.34 

 .30 



Inches. 



0.10 



.16 



.17 



.10 

 .16 

 .23 

 .12 



.19 

 .16 

 .16 

 .13 

 .10 



.11 

 .18 



.11 

 .21 

 .16 

 .13 

 .16 

 .23 

 .15 

 .18 

 .17 

 .18 



.18 

 .15 

 .17 

 .10 



.20 

 .18 

 .12 

 .13 

 .17 

 .16 

 .11 

 .13 



.21 



.16 

 .19 



.18 

 .25 

 .20 

 .17 



.17 

 .12 



.24 

 .18 

 .18 

 .21 

 .17 



.17 



.24 

 .23 



Bushels. 



• 16.0 



18.3 



24.5 



2.7 

 25.2 

 23.8 

 19.3 



24.3 

 26.8 

 17.4 

 5.7 

 25.8 



30.5 

 19.2 



4.1 

 13.3 

 28.3 



4.0 





 35.0 

 16.3 

 11.3 

 34.8 



5.5 



14.3 



13.8 



40.7 



4.2 



23.8 

 2.8 

 6.2 

 4.0 



56.5 

 10.6 

 4.4 



8.5 



18.0 



12.0 



9.2 



22.7 

 23.0 

 22.7 

 17.2 



26.8 

 15.6 



17.3 

 14.3 

 11.3 

 21.3 

 26.3 



2.1 



7.3 

 11.0 



Inches. 



0.17 



.23 



.20 



.14 

 .21 

 .30 



.17 



.20 

 .19 

 .21 

 .21 

 .20 



.13 



.18 



.13 



.18 

 .15 

 .10 

 .16 

 .20 

 .19 

 .18 

 .16 

 .17 



.22 

 .18 

 .22 



:i4 



.21 

 .23 

 .14 

 .18 

 .17 

 .21 

 .11 

 .19 



.20 



.19 

 .23 



.22 

 .26 

 .25 

 .20 



.15 

 .14 



.23 

 .22 

 .20 



.21 

 .16 



.22 



.33 

 .26 



Bushels. 

 22.6 



1914 



19.5 



1915 



36.5 



Willistom: 



1911 



7.6 



1912... 



39.7 



1914 



31.2 



1915... 



27.7 



Dickinson: 



1908 



33.8 



1909 



35.7 



1910 



26.8 



1911... 



23.3 



1915 



38.7 



Mandan: 



1915 



39.3 



1916 



21.8 



Edgeley: 



1907 



9.9 



1908 



16.0 



1909 



27.0 



1910 



5.7 



1911 







1912 



30.3 



1913 



16.8 



1914 



13.0 



1915 



40.3 



1916 



6.8 



Hettinger: 



1912 



17.5 



1913 



37.0 



1915 



37.4 



1916 



4.2 



Belle Fourche: 



1909 



32.2 



1910 



5.0 



1913 



16.8 



1914 



15.8 



1915 



57.2 



1916 



18.7 



1917 



11.1 



1918 



35.0 



Ardmore: 



1916 



15.8 



Scottsbluff: 



1913 



17.3 



1917 



18.7 



North Platte: 



1908 



40.5 



1909 



18.0 



1915 



27.8 



1916 



19.7 



Archer: 



1915 



25.7 



1917 



14.9 



Akron: 



1908 



13.7 



1909 



18.5 



1910 



8.5 



1912 .... 



16.0 



1915 



33.8 



Garden City: 



1909 



6.7 



Amarillo: 



1911 



19.0 



1914 



13.8 







Average 



.09 



.22 



.17 



17.0 



.19 



22.4 











