: 
BA, Nine ie GEA ior a ie a 
Se en cca i ee as ee ee 
Sl AEE i incscn., Sat 
1910] SCHREINER & SKINNER—ABSORPTION AND GROWTH oF 
34 per cent. The concentrations in these various groups are shown 
in the fifth column; the original concentration in all these cases was 
80 parts per million of the combined constituents. In the first group, 
which was the one giving the greatest growth, the concentration was 
decreased from 80 to 29 parts per million, although, as has already 
been shown, the ratio of the three constituents in the solutions of this 
group suffered less change than did the ratio in the other groups. 
This can be seen from the diagram in fig. 5. In the second group the 
concentration was reduced to 35 parts per million; in the third group 
of the three fertilizer constituents to 44 parts; in the group of two 
fertilizer constituents it was reduced to 54 parts per million; and in the 
group containing one fertilizer constituent it was reduced to only 
69 parts per million as an average. 
For the sake of comparison, a group containing all cultures having 
the three fertilizer elements, as well as the combination of the entire 
group of sixty-six cultures, is given. The table also very clearly 
shows the markedly different effects produced on the green weight 
by a single fertilizer element and when these are used in combinations 
of two and of three, the results being approximately 1.5, 2.2, and 
4.0, respectively, the higher group within the latter being as high as 
4.6. 
It will also be of interest to consider this same grouping in respect 
to the concentrations of the fertilizer elements individually. The 
number of cultures included in the group where two fertilizer elements 
were used was necessarily reduced, inasmuch as the ingredient in 
question did not occur in nine of the solutions, and the group of single 
fertilizer elements becomes, of course, reduced to only one culture, 
and for this reason has very little comparative value, although the 
result is usually decided enough to allow no doubt as to the general 
effect. 
In the fifth column of table II is given the concentration of 
_ P,O, found after growth, the original concentration being given 
in the fourth column for comparison. In the last column is shown 
the percentage decrease in the concentration of P,O,. This per- 
centage decrease was in the first group 50 per cent, in the second 
group 37 per cent, and in the third group 27 percent. In the combi- 
nation of two fertilizer elements, one of which was phosphate, it 
