*4 



Mineral Nutrition of Plants 



n 



Prairie soils, Degraded 

 Chernozems 



Dark Groy and Black Soils of 

 Tropical Sovannos (with some 

 inclusions of Chernozems and 

 Reddish Chestnut Soils) 



Sierozems, Desert, ond 

 Red Desert Soils 



Chernozems and Reddish 

 Chestnut soils (with somemctus 

 ions of dork gray and black soils 

 of tropicol sovannos) 



Chestnut, Brown, and 

 . Reddish Brown Soils 



Podzols 



(with much bog ) 



Figure i. Provisional schematic soil map. 



