To control the Colorado potato beetle hand picking was prac- 

 ticed, beginning with the appearance of the old beetles. In 

 this way little injury was done by them at either locality. It 

 transpired, however, when the tubers were well set, and per- 

 haps one-half grown, that severe "tip-burn" struck the vines at 

 all four places, greatly interfering with and reducing the yields, 

 except at Janesville. At all places except Janesville the vines 

 dried completely before the crop matured. 



RELATION OF YIELDS TO FERTILIZATION. 



YIELDS OF CORN. 



It was the aim to have the corn cut on each soil type as soon 

 as the ears were fully matured and the stalk at the proper stage 

 for cutting and shocking, with the leaves and husks yet green. 

 The weight of each row was determined as cut from the several 

 sub-plots and the sums taken for the total mean yield under 

 each fertilization for the respective soil types. In the next 

 table are given the comparative green weights of corn as cut, 

 which may be taken to represent somewhat less than the 

 amounts of silage produced. 



Comparative green weights of corn. 



It will be seen from this table that, with each and every soil 

 type except the Hagerstown Loam, there is a well marked ten- 



