70 



WILTING COEFFICIENT FOR DIFFERENT PLANTS. 



GRAPHICAL REPRESENTATION OF THE RELATIONSHIP BETWEEN THE 

 WILTING COEFFICIENT AND THE PHYSICAL MEASUREMENTS OF 

 MOISTURE RETENTIVITY. 



The experimental results given in the preceding tables are shown 

 graphically in figure 9. The wilting-coefficient determinations are 

 plotted as abscissas, while the axis of ordinates is taken successively 

 to represent the moisture equivalent, the hygroscopic coefficient, the 



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Fig. 9.— Chart showing the linear relationship between the wilting coefficient and physical measurements 

 of the moisture retentiveness of soils. The wilting coefficient is represented by the axis of abscissas, 

 while the axis of ordinates for the different graphs represents the moisture retentivity of the soil as meas- 

 ured by the hygroscopic coefficient, the moisture equivalent, and the moisture-holding capacity, and 

 as computed from the mechanical analysis. The quantity employed as ordinate in each case is designated 

 on the graph. 



moisture-holding capacity, and the computed value of the wilting 

 coefficient as determined from the mechanical analysis. The resulting 

 graphs are designated by their respective ordinates. The slope of the 

 graph in each case corresponds to the ratio used in the equation. 



230 



