'E. 



shorter than on the balance of the field. Under ordinary con- 

 ditions this would have been the heaviest corn. Upon making 

 inquiry of the owner, it was learned that in the Spring of the 

 previous year he had applied manure to a strip of land along 

 this side of the field and it was his judgment that the shorter 

 row of corn marked the boundary of that area. The fertiliza- 

 tions made here were at right angles to the line referred to. 

 It is not unreasonable, therefore, to suppose that, for this soil, 

 the adding of 15 tons of manure per acre, toi that which had 

 been applied the preceding year, really passed the limit of in- 

 creasing the yield of corn for this soil under the conditions of 

 this season, which was rather cold and abundantly wet. 



The mean increase in yield of shelled corn due to the appli- 

 cation of fertilizers is expressed in the next tsable. 



Increase in yield of shelled corn due to fertilization. 



It will be seen, from the data here presented, that, on the 

 four poorer soils, the increase in shelled corn has been nearly 

 proportional to the amounts of manure applied to the soils, and 

 at the mean rate cif 60.10 Ibs. of water-free kernels per ton of 

 manure used, thus: 



