16 MAINE STATE COLLEGE 



showing the relative development of the plants produced. At the 



time of harvesting, the crops of wheat, barley, corn, peas and 

 beans produced in each box were weighed separately in an air dry 

 condition, after which the amount of dry matter was determined in 

 the combined crop of the three boxes of each set. In the com- 

 bined crop of each set the nitrogen was determined as well as the 

 phosphoric acid, potash and other mineral matters. 



With the pototoes and turnips the crops were weighed fresh at 

 harvesting. In other respects these crops were treated like the 

 others. 



The results of this investigation are shown in the following 

 tables with the accompanying plates : 



