24 BOTANICAL GAZETTE [JULY 
and so on to the apex of the triangle. In the same manner, the line 
of cultures from 3 to 57 contained 8 ppm. NH, as nitrate; the line 
6 to 58, 16 ppm.; and so on up to 80 ppm. NH, in culture 66. The 
line of cultures from 2 to 65 contained 8 ppm. K,O; line 4 to 64, 16 
ppm.; and so on up to 80 ppm, K,O in culture 56. 
It will be interesting to see what effect these different amounts 
of each fertilizer ingredient have had on the growth of the plant, and 
the removal of this constituent during the period of growth. In such 
PFE rem Tee ea ee eee eee Ane 
. TABLE V 
SHOWING THE RESULTS OBTAINED FOR P,O, IN THE CULTURES CONTAINING DIFFERENT 
MOUNTS OF P,O; (PPM.=PARTS PER MILLION) 
AVERAGE AVERAGE DECREASE OF 
PERCENTAGE | Parts : P,0 
or EO seep tony Seis Wie od POs Averace |DECREASE FER 
IN P.O; dar Saas GREEN UNIT OF a 
FERTILIZER IN SOLUTION WEIGHT GREEN : 
MIXTURE SOLUTION Pode ppm. percentage WEIGHT 
100 80 7S es O23 0.648 12.9 
72 bis 10.5 14.6 1.226 8.6 
80 64 54-1 9-9 15-5 1.983 5.0 
70 56 46.2 9.8 r7.5 2.580" pees ke / : 
60 48 37 10-2 Sto3 3.045 35% : 
50 40 29.2 10.8 27.0 3-340 3-2 a 
40 32 22.2 9.8 30.6 3-295 3.0 3 
30 24 16.2 7.8 32.6 3-308 2.3 £ 
20 16 9.2 6.8 42.5 3-558 2.9 
10 8 2.9 Sox 63.8 3-640 1.4 
° ° = ss 3-135 fiat 
consideration it must always be borne in mind that there were present 
at the same time varying quantities of the other fertilizer constituents. 
For the purpose of such a comparison, the growth and concentration 
in the cultures along any of these lines has been studied and is pre- 
- sented in this section. With this in view all the results obtained in the 
various cultures in any one line were added together, and as the 
number of cultures naturally differ from line to line, the average 
was determined in each case for comparison, although this average 
is not intended to mean that all the cultures along this line were simi-_ 
lar, for it has already been shown that in general the points in the 
middle were higher than those at the end of any one of these lines. 
PHOsSPHATE.—In table V are given the results obtained for P,O,; 
in the cultures containing different amounts of P,O,, varying from — 
80 to 8 ppm., as shown in the second column of the table. 
