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IV. Clay soils: 



(i) (n) (III) 



Bahr, Dumraon Sibpur 

 Patna. Farm. Farm. 



Insoluble Silicates and Sand ... 72-64 % 80-90 / o 73-58 % 



Fe 2 O 3 ... ... 7-58 6-12 6-36 ,, 



A1 2 O 3 ... ... 9-89 ,, 6*50 ,, 7^3 ., 



MnO ... ... -14 -14 -ii 



CaO ... ... i'oi ,, 2-07 1-52 ,, 



MjjO ... 1-64 ,, 1-17 ,, 1-61 ,, 



K 2 O C c 



Na,0 ... ... I' 82 " <73 " ' 64 " 



P 2 O 5 ... ... '07 -08 -ii 



S0 3 Nil Nil -03 



CO 2 ... ... -28 -05 1-35 



Organic matter & combined water *5'93 ,, 12*24 1676 



lOO'OO lOO'OO lOO'OO 



* N-'O5i per cent. t -041 percent t '065 per cent. 



71. Two other samples of Sibpur Farm Soil analysed by Dr. 

 Leather gave the following results : 



Insoluble. Silicates and Sand 



Soluble Silicates 



Iron (Fe 2 O 3 ) 



Alumina (A1 2 O 3 ) 



Manganese (MnO) 



Lime (Cao) 



Magnesia (MgO) 



Alkalis (soda and potash) 



Sulphuric acid (SO 3 ) 



Phosphoric acid (P 2 O 5 ) 



Carbonic acid (Co 2 ) 



Organic matter and combined water ... 



Nitrogen (total) 



