SOIL FORMATION, COMPOSITION, ETC. 



TABLE VI. THE CONTENT IN PLANT FOOD OF CERTAIN 

 AIR-DRIED LEGUMINOUS CROPS 



PERCENTAGE COMPOSITION. 



Nitrogen (N). 



Phosphoric 

 Acid (P 2 O 5 ). 



Potash (K 2 O). 



Red clover, medium . . . 

 Red clover, mammoth . 



Alsike clover 



White clover 



Crimson clover 



Alfalfa 



Cowpea 



Bean 



Vetch. . 



2.07 

 2.23 

 2.34 

 2.75 

 2.05 

 2.19 

 2.50 

 1.91 

 2.80 



0.38 

 0.55 

 0.67 

 0.52 

 0.40 

 0.51 

 0.52 

 0.40 

 0.75 



2.20 

 1.22 

 2.23 

 1.81 

 1.31 

 1.68 

 1.47 

 1.32 

 2.30 



TABLE VII. COMPOSITION OF VARIOUS CROP RESIDUES 



PERCENTAGE COMPOSITION. 



Nitrogen (N). 



Phosphoric 

 Acid (P 2 O 6 ). 



Potash (K Z O). 



Cornstalks j 0.80 



Wheat straw 0.59 



Oat straw 0.62 



Cotton bolls 1.36 



Cotton leaves 2.37 



Cotton stems . 83 



Cotton roots 0.17 



Cowpea vines 2 . 50 



Alfalfa 2.19 



Soy bean straw 1 . 75 



Red clover, medium 2 . 07 



Red clover, mammoth. ... 2.23 



Alsike clover 2 . 34 



White clover 2 . 75 



Crimson clover 2 . 05 



Pasture grasses (mixed) ... - 0.91 



Timothy 0.48 



Orchard grass . 43 



Sorghum . 23 



S. potato vines 2.00 



0.18 

 0.12 

 0.20 

 0.40 

 0.46 

 0.22 

 0.24 

 0.52 

 0.51 

 0.40 

 0.38 

 0.55 

 0.67 

 0.52 

 0.40 

 0.23 

 0.26 

 0.16 

 0.09 

 0.28 



1.04 

 0.51 

 1.24 

 2.90 

 0.83 

 0.92 

 0.86 



47 

 68 

 32 

 20 

 22 

 23 

 81 

 31 



0.75 

 0.76 

 0.76 

 0.23 



2.81 



