50 



THE PRINCIPLES OF SOIL MANAGEMENT 



Table V, continued 



Chemical Composition of Soils Deposited by Water. 



Complete Analyses 



Brick Clays of Southern Plain 



1. 

 2. 



3! 



4. 

 5. 



6. 



7. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 



Insoluble 



Silica (Si0 2 ) 



Alumina (A1 2 3 ) . . 

 Ferric iron (Fe 2 3 ) 

 Ferrous iron (FeO) 

 Sulfur trioxid (SO 

 Phosphoric acid 



(PA) 



Lime (CaO) . . 

 Carbon dioxid CO 

 Magnesia (MgO) 

 Soda (Na,0) . . 

 Potash (K,0) . 



Water 



Organic matter 

 Volatile matter 



VI 





|o 



o 



Si 



a o 



c g 



53.75 



24.91 



7.99 



0.70 



i .12 



2.94 



1.03 



VII 



S3 

 c 2 



OO 



'St 



o S 



o 03 



' E s 



70.45 



17.34 



3.16 



0.22 



I 0.70 



0.98 



6.63 



VIII 



o 

 .2 s 



tj . 

 02 gr 



90.00 

 4.60 

 1.44 



0.10 



0.10 



t 



t 

 3.04 



IX 



a r 



a o 

 go 

 o 



"S.g 



'S E 



B 



.2 03 n 



o,2 



+ silica 



44.40 



17.90 



4.50 



9.50 

 9.55 



1.88 



t 

 4.58 



X 



o 



o 



' 



a>'a 



S S - 



ft'! 



a. 2 



<3 

 02 



93.23 

 sol. 

 2.36 

 1.25 



0.03 

 0.12 

 0.02 

 0.18 

 0.07 

 0.26 



2.33 



XI 



--3 

 -T3 



o 



ss 



a 



03 

 02 



94.46 

 1.67 

 0.92 

 0.32 



0.09 



0.11 



0.07 



0.04 

 0.04 

 0.19 



1.88 



bends," " cut-offs," or "bayous," as they are variously 

 termed, become in succession lakes, ponds and marshes, 

 where the clay-laden water is gradually evaporated 

 or filtered away, leaving behind only the very fine 

 material that may be carried in suspension almost 

 indefinitely. As a result of these processes much of the 



