80 



BOARD OF AGRICULTURE. [Pub. Doc. 



Partial Composition of Soils and Crops. 

 Soils to the Depth of One Foot, 



Crops. 



The point to which I now desire to call particular atten- 

 tion is the fact made evident by these figures, that, as 

 compared with the amounts removed by even very large 

 crops, the soil contains an enormous supply of the prominent 

 constituents of plants. Even the poorest of the soils under 

 consideration, the Agawam "plain" land, contains as much 

 nitrogen in the upper six inches as eight enormous crops of 

 corn, as much phosphoric acid as twenty-nine such crops, 

 and as much potash as twenty-eight such crops. Of course 

 we all know that most of this plant food must be in una vail- 



