20 BOTANICAL GAZETTE [JULY 
The grouping shown in fig. 9 was made because by so doing the 
area of the greatest growth, which was always somewhat below the 
center of the triangle, will fall in these experiments into the central 
group. This central grouping is shown in the diagram as group 4, 
the connecting lines showing the cultures included in this group. 
Group 6 takes in the cultures lying immediately outside of this cen- 
tral group. The same applies to group c, which is, however, farther 
removed from the central group. It will be noticed that these three 
groups contain the three fertilizer constituents. The next or fourth 
group contains all of the cultures in which two fertilizer elements occur, 
as shown by the lines. The fifth and last. group consists of the sum 
of the single fertilizer elements. In handling the data, therefore, the 3 
average green weight in grams for each of these groups was deter- 
mined, together with the average final concentration in the respective _ 
fertilizer constituents, or their combinations. In table I the average _ 
green weight and combined concentration of P,O,, NH,, and K,O ~ 
is shown. . 
TABLE I 
AVERAGE GREEN WEIGHT AND CONCENTRATION OF P,0;+NH,;+K,O OBTAINED IN 
DIFFERENT REGIONS OF THE TRIANGULAR DIAGRAM FIG. 9 
(ppm.=parts per million) 
AVERAGE P,O;, NH3, 
— AveracE | REta- anp KO 
CULTURE SOLUTIONS CUL- ‘euene ‘Sncee 
IncLupep| IN GRAMS |WeEIGHT |Original| Final ean 
ppm. | PPM. |removed 
Three fertilizer elements, group a. . 10 4.645 100 80 29.0 | 63.8 
Three a. elements, group b..|_ 11 4.120 88 80 35-0 | 56.3 
Three fertilizer elements, group c. . 15 3.507 75 80 | 44.1 | 44-9 
° Was elements... ........ 27 2.156 46 80: | 54-1 | 30-8 
— fertilizer. element. 3 1.502 34 80 | 68.8 | 14.0 
asbacbinnrg elements, groups 
Feales cheb ee eee Dg 36 4.010 80° | 37.0 153 8 
All callings combmed sso ec, 66 4189 80 | 45.4 2 
In the third column the relative green weight for the different 
groups is given, taking the results in group a as 100. From this it 
will be seen that the growth in group 6 is 88 per cent of that in group @, 
group c is 75 per cent; in the two fertilizer element group it is 46 pet 
cent, and with the single fertilizer element the average result is only 
