Potassium to Growth ' in Plants . 
21 7 
The distribution of potassium in the plants is shown in Table XXVII. 
It will be noticed that the relative distribution of potassium in roots and 
tops is throughout the same, thus agreeing with all previous experiments 
Table XXVII. Effect of delayed additions of potassium on the amount of 
potassium in Early pedigree Dent field Corn grown in water culture . 
Total 
Ratio of 
potas- 
sium 
Potassium 
Potassium 
absorbed 
Nutritive solution 
No. of 
Amount of potassium 
utilized per 
potas- 
utilized from the 
used. 
plants. 
in 
gramme of dry 
sium 
per 
nutritive 
matterformed. 
content 
gramme 
solution 
of tops 
dry 
by one 
Tops. 
Roots. 
Entire 
plants. 
Tops. 
Roots. 
to 
roots. 
matter 
formed. 
plant. 
Mg. 
Mg. 
Mg. 
Mg. 
Mg. 
Mg. 
Mg. 
Mg. 
Solution F. 
12 
726.9 
310.4 
1037-3 
68-21 
70-35 
0-96 
68-8 
85-59 
Solution F, less 
12 
794-8 
320-2 
1115-0 
69'45 
68*76 
1 .01 
69-2 
92.06 
potassium. Potas- 
sium added after 3 
days. 
57.26 
Solution F, less 
12 
576-9 
210-8 
787.7 
55-91 
o-97 
56.2 
64.79 
potassium. Potas- 
sium added after 6 
days. 
Solution F, less 
12 
359-o 
144.2 
503-2 
43-87 
45.12 
o -97 
44-2 
•41.08 
potassium. Potas- 
sium added after 9 
days. 
39' 16 
Solution F, less 
12 
210.5 
73-2 
283.7 
38.72 
1 .01 
39-o 
22.79 
potassium. Potas- 
sium added after 12 
days. 
Solution F. Po- 
tassium absent. 
12 
I 5* 1 
4-9 
20-0 
6-95 
6-22 
1. 11 
6-7 
0-82 
with corn and wheat ; that the potassium utilized per gramme of dry matter 
formed is slightly higher when this element is only added after three days, 
and then decreases rapidly, the figures obtained agreeing remarkably with 
those given in previous experiments with corn an dwheat. Again, as in the 
case of wheat (see p. an), there is no direct relation shown between 
potassium absorbed and dry matter formed, as the following figures 
indicate : 
In the full nutritive solution there was formed by t grm. potassium 
14-52 gnn. dry matter. 
When potassium was added after 3 days there was formed by 1 grm. potassium 
14-46 grm. dry matter. 
j t ,, „ „ 6 ,, „ „ by 1 grm. potassium 
17.77 grm. dry matter. 
„ j> „ „ 9 „ „ „ by 1 grm. potassium 
22*67 grm. dry matter. 
,, „ „ „ 12 „ ,, ,, by 1 grm. potassium 
25.64 grm. dry matter. 
When potassium was absent „ ,, by 1 grm. potassium 
149-25 grm. dry matter. 
When potassium was not added to the nutritive solution until the 
