154 THE PRINCIPLES OF SOIL MANAGEMENT 



Table XXII 



75. Volume of water held by different soils. The 

 columns of soil from which the figures presented on 

 page 148, with the accompanying curves, were obtained, 

 were forty-five inches in height, with their lower ends 

 dipping in water. As they were run for several months, 

 their moisture content represents the maximum capacity 

 for each soil. Under these conditions, the mean moisture 

 content was as follows: 



Table XXIII 



1. Dune sand 



2. Coarse sand. . . . 



3. Fine sandy loam 



4. Light silt loam . 



5. Clay 



6. Muck soil 



Dry 

 poros- 

 ity . 

 Per 

 cent 



52 

 51 

 50 

 50 

 59 

 80* 



II 



Final mean 



water content 



Per cent 



10.7 

 10.6 

 18.0 

 20.9 

 30.4 

 250.0 



III 



Approximate 



per cent of 



moisture at 



which crops 



will wilt 



3 



3 



5 



10 



17 



80 



IV 



Per cent of 

 available 

 moisture 



7.7 



7.6 



13.0 



10.9 



13.4 



170.0 



Estimated. 



