SOIL STRUCTURE 



179 



Effects of Texture, Granulation, Humus, and Moisture 

 on Cohesion of Soils. (Puchner.) 



Soil 



Penetration in Grams at Various 

 Moisture Contents, 



100 

 per 



cent 



80 

 per 

 cent 



60 

 per 



40 * 

 per cent 



20 



per cent 







per cent 



Clay 



2 clay + 1 quartz 

 1 clay + 2 quartz 

 Quartz .... 

 2 'clay + 1 humus 

 1 clay + 2 humus 

 Humus .... 

 Pulverized loam . 

 Granulated loam 



(granules .5-9 mm 

 diam.) . . . " 



114 

 30 

 85 



167 

 44 

 59 



115 

 35 



58 



2,404 



437 



1,887 



2,937 



754 



1,010 



1,414 



272 



85 



9,537 

 6,304 

 3,803 

 4,237 

 4,704 

 1,704 

 1,904 

 775 



115 



11,870 

 12,370 

 10,003 

 5,137 

 7,204 

 4,204 

 1,804 

 1,408 



492 



15,037 



13,204 



13,703 



8,370 



9,537 



5,070 



870 



8,125 



808 



20,037 



15,704 

 6,057 

 2,370 



12,037 



1,637 



487 



12,358 



1,342 



Fig. 26 



so 



The effects of texture, humus, and moisture on the cohesion 

 of soils. 



