eS EE: ee 
1910] SCHREINER & SKINNER—ABSORPTION AND GROWTH 19 
effect the bacteria may have had, it was slight in comparison to the 
activities of the plant itself under the conditions of this experiment. 
Relation between growth and concentration of P,O., NH,, and 
K,O found in the various cultures 
The experimental results reported seem worthy of a closer analysis 
than that accorded them thus far. General tendencies as indicated 
P20 
Fic. 9.—The arrangement of the culture solutions in grou hre 
fertilizer element groups; d, two fertilizer element group; e, one posers pHa: 
group. 
by the individual cultures have already been pointed out, and these 
general impressions gleaned from the individual results can be better 
shown by a method of grouping. This method of grouping should 
be particularly valuable in showing the general tendencies, either in 
regard to plant growth or concentration differences connected there- 
with. Such a system of grouping, comparing different regions of the 
diagram, can be made in various ways. 
