MARYLAND GEOLOGICAL SUKVEY 



155 



soluble lime. It is probable that the ^^ew Jersey greensand marls 

 would on the average have a phosphoric acid content fifty times as 

 great as the corresponding marls from Maryland. It is, therefore, 

 very questionable whether many of the greensand marls of Mary- 

 land can have any important economic future as a fertilizer when 

 compared with other products now on the market. 



Chemical Analyses of Gkeensand and Collixgton Sandy LoAii. 



Constituent. 



6034* 

 Per cent. 



Potash (K,0) I 2.565 



Soda (Na^O) j -391 



Lime (CaO) 1™ 



Magnesia (MgO) 



Manganese oxide (MnO) . . . 



Iron (FeaO,) 16-306 



5454.+ 

 Per cent. 



5455.? I 5456.§ 5459.' | 5460.°'^ 



Per cent. Per cent. Per cent. Per cent. 



.740 



Alumina ( AloOs) 



Phosphoric acid (PoOO 

 Sulphuric acid (SO, ) . • ■ 



Insoluble 



Moisture 



Volatile organic matter. 



.130 



.065 



.012 



r4.0-t9 



2.130 



1.975 



858 

 .980 

 .140 

 .136 

 .037 

 9.488 

 4.011 

 .088 

 .132 



0'.888 

 .718 

 .155 

 .396 

 .030 

 4.011 

 2.448 

 .054 

 .116 



0.445 



2.401 



.110 



.474 



9.067 



4.097 



.104 



.096 



0.910 

 .418 

 .155 

 .185 

 .035 

 3.632 

 2.856 

 .053 

 .110 



0.376 

 .692 

 .210 

 .336 

 .037 

 6.248 

 4.742 

 .076 

 .056 



♦Greensand deposit. Upper Marlboro, Md. 

 tSubsoil, 8 to 36 inches, Oak Grove, Md. 

 JSoil, to 7 inches, MuUikin, Md. 



SSubsoil of 54.55, 7 to 36 inches. 

 °Soil. to 9 inches, Mullikin. Md. 

 -Sulisoil of 54.59, 9 to 3ti inches. 



■ An inspection of the table will show that the soils and subsoils 

 derived from glauconitic material are rich in potassium, as compared 

 with agricultural soils in general, although a proportionally large 

 amount of this element disappears in the weathering process during 

 soil formation. On the other hand, neither the lime nor phosphoric- 

 acid content of these soils is materially different from that of the 

 original material and both are lower than is considered desirable for 

 o'ood soils. The indications of this examination are that these soils 



