if; 



BULLET IX k 'K. 



different soil types quite as well as did the corn. The results 

 which were secured from the potatoes are given! in the next 

 table : 



Total yields of potatoes under five fertilizations on 8 soil types. 



Notwithstanding the disturbing factor of "tip-burn," which 

 has much reduced the yield, there is clearly shown a marked 

 influence upon yield effected through the application of such 

 moderate amounts of manure as have been here used. Even 

 the 5 tons of stable manure has made a clear and even strong 



O 



increase in yield on each and all of the 8 soil types, whether 

 naturally poor or strong. 



Then, too, in the cases of the Janesville Loam and the 

 Hagerstown Loam, where there were not wholly concordant re- 

 suite with corn, the differential effect of the varying amounts 

 of manure are clearly defined by the yields. The soil was 

 more uniform at Lancaster on that portion of the Ilagerstown 

 Loam occupied by the potatoes than was that occupied by the 

 corn, and the area at Janesville, where the potatoes were 

 planted, had not been manured the previous year, as had been 

 the case with that occupied by the corn, as already explained. 



The increase of potatoes associated with the different 

 amounts of manure applied, and with the guano, appear in the 

 next table. 



