SOIL HEAT 



ZiOV 



The Effect or Soil Moisiuel ox the Volume SpEcinc 

 He IT or Soil, the IMoistube being Expees&ed as a Peb- 



CENTAGE or THE ToTAL WaIER CAPACITY 



Jr o 



Quartz 2919 



Kaolin 

 Humus 



2333 



1647 



s ^ 



n^^ 



;oi 



3300 

 2945 



2427 



1*1 r. fe 



3682 

 3558 

 3207 



J c, w 



o f^ti 



coO!> 



4063 

 4170 

 3987 



1-3 cj H 



4445 

 4783 

 4767 





4S26 

 5595 

 554S 







5208 5580 

 6008 6620 

 6328 7108 



H ch H 



5972 

 7233 



7888 



H f^ Cm 

 coOP*- 



6353 



7812 

 8669 





6755 

 S458 

 9449 



It is at once evident, from these data and the accom- 

 panying curves (see Fig, 46), that moisture, in its effect 

 on the specific heat of an average soil, is so potent as to 





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DRY /O SO ^O jU> Jv 60 to 80 S^p4iO 



Fig. 46. — Curves showing the effect /)f moisture on the volume specific 

 heat of soils of different texture and humus content. 



