428 



PRINCIPLES OF SOIL MICROBIOLOGY 



TABLE 31 

 The composition of a few natural organic materials 



Hay 



Oats straw 



Barley straw 



Corn cobs 



Corn fodder 



Rice straw 



Straw of winter cereals . 



6.05 

 4.81 

 5.56 

 1.80 

 6.15 

 5.43 

 4.33 



TABLE 32 

 Influence of age on the composition of oat straw 



Crude protein 

 Crude fiber. . . 



Cellulose 



Total nitrogen 



Ash 



P*0 6 



K 2 



AUGUST 16 



1.4 

 28.3 

 23.6 



0.200 



6.6 



0.164 



0.98 



TABLE 33 

 Elementary composition of a few plant products 6 



Dry pine needles 



Oak leaves 



Maple leaves 



Wheat straw 



Corn stover 



Grain stubble and roots 



Lupine 



Luzerne 



Clover 



31.57 

 13.68 

 19.31 

 7.90 

 11.68 

 32.12 

 12.99 

 10.37 

 10.29 



6 Dvorak, J. Studien fiber die Stickstoffaniiufung im Boden durch Mikro- 

 organismen. Ztschr. landw. Vers. Sta. Oesterreich., 15: 1077-1121. 1912. 



