40 



THE ECOLOGICAL RELATIONS OF ROOTS. 



holding capacity of 50 or 60 per cent of its dry weight. By the action 

 of water and especially of the prevaihng southwest wind, the prairie 

 topography has been molded into rounded hills which reach a height 

 of 100 to 360 feet and resemble sand-dunes. The soil is usually many 



Table 8. 





SW. slope. 



NE. slope. 





SW SloDP 



NF, si on A 



Date. 



Wilting 



Wiltina- 



Date. 



Wil+ino' 



Wil+ino' 



T T XI UXXX^ 













OUcillCxolXb 



1913. 







1913. 







Apr. 25 



10.0 



21.0 



Aug. 15 ... . 



-4.2 



0.0 



May 2 



12.0 



22.2 



Aug. 22 



—2.6 



— 1.3 



May 8 



9.0 



20.5 



Aug. 28 



-3.0 



-1.0 



May 14 ... . 



13.3 



25.6 



Sept. 5 



-2.2 



-2.0 



May 20 



13.0 



25.0 



Sept. 10 



-3.4 



-1.8 



May 27 



5.2 



18.0 



Sept. 17 



-3.9 



-1.0 



J\ine 2 . . . . 



2.0 



16.6 



Sept. 25. . . . 



-2.2 



0.7 



June 10 ... . 



4.8 



21.2 



1914. 







June 15 ... . 



5.0 



17.4 



May 22 



4.0 



13.0 



June 25 ... . 



8.6 



26.0 



June 2 



0.1 



7.5 



July 2 



4.6 



19.0 



June 26 



-1.3 



1.3 



July 8.... 



4.0 



15.2 



July 4.... 



-0.2 



1.8 



July 16.... 



-0.5 



9.4 



July 8.... 



-1.2 



1.1 



July 21.... 



-0.5 



6.4 



July 19.... 



-4.5 



0.0 



July 28.... 



-2.6 



4.4 



July 27.... 



-5.0 



-2.0 



Aug. 4 . . . . 



-1.4 



0.2 



Aug. 3 



-4.0 



-2.0 



Aug. 9 



-3.0 



0.0 



Aug. 10 



-4.0 



-2.8 



Table 9. 

 Southwest Slope. 



Date. 



Wilting coefl&cients at stated depths. 



11.5 at 

 to 6 inches. 



11.0 at 

 6 to 12 inches. 



14.2 at 

 2 feet. 



13.5 at 

 3 feet. 



13.5 at 

 4 feet. 



14.0 at 

 5 feet. 



Dec. 13, 1913 

 Apr. 18,1914... 

 June 3, 1914 . . . 

 July 6,1914... 

 Aug. 15, 1914... 



14.5 

 -1.0 

 -2.5 

 -4.5 



11.5 

 13.5 

 1.4 

 0.0 

 -1.6 



-1.2 

 8.1 

 3.4 



-0.7 

 1.9 



-0.3 

 9.7 

 7.3 

 1.0 

 0.6 



0.5 

 8.2 

 8.1 

 5.1 

 2.1 



0.5 

 5.5 

 8.0 

 6.8 

 2.6 



Northeast Slope. 



Date. 



Wilting coefficients at stated depths. 



12.2 at 

 to 6 inches. 



12.2 at 

 6 to 12 inches. 



13.4 at 

 2 feet. 



13.6 at 

 3 feet. 



14.2 at 

 4 feet. 



14.0 at 

 5 feet. 



Dec. 6, 1913 

 Apr. 18, 1914... 

 June 3,1914... 

 July 6,1914... 

 Aug. 15, 1914... 



22.8 

 6.6 

 3.3 



-3.0 



15.8 

 20.0 

 8.5 

 1.0 

 -1.7 



11.2 

 15.6 

 13.1 

 6.8 

 -0.6 



-0.8 

 13.4 

 16.5 

 12.1 

 0.0 



0.6 

 9.9 

 13.6 

 10.8 

 2.3 



5.0 

 9.5 

 9.8 

 3.9 

 3.0 



