




EFFECT OF NITROGENOUS FERTILIZERS. 189 
Explanation of Table 35.— This table shows the results of 
the individual analyses of samples of different species of grasses 
grown on plots which received different quantities of nitrogen. 
These grasses were grown on small plots, mostly one-eightieth 
of an acre in size, in the Station grass garden. Owing to the 
small size of the plots no effort was made to determine the 
weight of the yield per acre. The general plan of the experi- 
ments was that of special nitrogen experiments, but with fewer 
plots. In most cases there were four plots for each kind of 
grass, and the experiments were continued on the same plots 
for three to seven years. The plots included in each experi- 
ment were generally a “nothing” plot, a “ mineral” plot, a 
plot with the one-third ration, and a plot with the full ration of 
nitrogen, in addition to the minerals. In a few cases samples 
were taken from still smaller plots which were divided into two 
parts, one of which was supplied with the one-third and the 
other with the full ration of nitrogen. 
The samples were usually taken at the time the grasses were 
in blossom, or soon after, and care was exercised to exclude 
from the sample of any particular grass any of the other species 
of grass or any clover that might be growing on the plot. The 
averages given in this table in bold face type appear in the 
summary Table 11, on page 134, in the discussion. 
