22 
Radium is not a plant food. The necessity for fertilizer is 
but little decreased by its use. The fertility of unused groun 
will re increase at a much greater rate when treated 
by radium. 
Su re worthy of investigation are the effects < on yield o 
special consideration. The soil here was of a totally different 
character from that at Nutley. The basic soil is a stiff clay, 
h. 
Another important difference is that the R A F as well as the 
fertilizer, was drilled in the rows or deposited in the hills, instead 
of being sown broadcast as at Nutle 
Finally, the plots were of large size, in no case smaller than 
one crop were tl e 
all other respects the conditions were uniformly maintained for 
all five plots. Owing to one or more or all of these differences, 
the increases secured by the use of the R A F were nearly double 
what they were at Nutley. There is, however, a general uni- 
formity in the relative results on the several plots of any one 
crop. These results are displayed in the following table: 
