248 CROP PRODUCTION 



ting each of these into eight more you will easily see that 

 the surface area depends entirely upon the size of the 

 particles. 



The water held by capillary attraction depends upon 

 the surface area of the particles. Consequently a coarse 

 gravel would hold less moisture than a coarse sand, 

 and the coarse sand would hold less than a fine sand. 



