
ANALYSES OF FODDERS AND FEEDING STUFFS. 85 
results approximately accurate. ‘T‘he tests were made in aque- 
ous extracts of the different samples. The amounts of nitrates 
present in these extracts were estimated by comparing the in- 
tensity of the color produced in the aqueous extract with that 
produced in a standard solution containing a known amount of 
nitrate. | 
The intensity of the blue color produced in the extracts was 
affected somewhat by the presence of organic coloring matters. 
The extracts of the grasses were highly colored, some being 
almost opaque. ‘The effect of these coloring matters was modi- 
‘fied to some extent by diluting the extracts. 
There was a larger proportion of nitrates present in the 
samples from the pot experiments than in those from the plot 
experiments; the comparison, however, is between different 
crops. It may be possible that there was less leaching of 
nitrogen from the soil in the pot experiments, but on this point 
these investigations furnish no evidence. 
While the first cutting of orchard grass in the pot experi- 
ments contained appreciable amounts of nitrates, the rowen 
from the same pots contained none. 
The corn seeds, as was to be expected, gave no tests for n1- 
trates. No nitrates were found in the corn stover grown on 
the plots supplied with the mineral fertilizers without nitrogen. 
DESCRIPTION OF SAMPLES. 
The analyses given in Table 20 are ‘those of the field crops 
grown in the plot experiments of 1900 reported on pages 34-60 
of the present Report. The conditions under which the samples 
described below were grown, is there given. The analyses given 
in Table 21 are those of the various fodders and feeding stuffs 
used in feeding tests with dairy herds conducted by the Station, 
as described on-later pages. 
GREEN FODDERS, 
No. 6261. Ensilage corn.—(Ohio white dent.) Sample of about 150 pounds 
taken September 18, 1g00, from five loads being cut up for the silo; this was 
thoroughly mixed and sub-sample taken and dried in steam drier. Lower 
leaves of stalks were somewhat dried, otherwise fodder quite succulent. Ears 
beginning to glaze or in dough stage. 
Nos. 6262-6271. Cow pea fodder.—Grown in the special nitrogen experi- 
ments of 1900. Samples taken September 21 and 22, 1g00. In sampling the 
crop taken from each plot, large samples of about 25 pounds were taken by 
Wf 
