PRACTICE XI (Continued) 



Sandy soils have less pore space than clay or clay loams. 

 How will this'^'affect the apparent specific gravity ? 

 Calculate the weight of a cubic foot of each soil, loose and 

 compact. 



References. 



*' Soils," Lyon and Fippin, pp. 94-96 and 128. 



'^The Soil," Hall, pp. 63-64. 



" Physical Properties of Soil," Warington, pp. 42-44. 



'^ The Soil," King, p. 85. 



'^ Soils," Hilgard, pp. 107-108. 



Soils 



Sand or 

 Sandy Loam 



Gray Silt 



OR Gray 



Si r T TjOAm 



Brown Silt 

 Loam 



Cla^ 

 Clay 



Y OR 



Loam 



Pe 



AT 

















Li 



Ci 



L 



c 



L 



c 



L 



C 



L 



c 



Weight of tube and air- 



1 

 2 























dry soil 























A-verage of trials . . . 























Weight of tube .... 























Weight of air-dry soil . . 























Per cent of hygroscopic 

 moisture 























Weight of water-free soil 

















1 





No. cc. water to fill tube . 

















I 





Apparent specific gravity 



- 





















Weight of a cubic foot in 

 pounds 























1 L = Loose ; C = Compact. 



25 



