8 4 
Journal of Agricultural Research 
Vol. IX, No. 3 
potash, and absorbed 1.32 times the normal amount of potash per gram 
of roots. The plants partially supplied with potash absorbed consid¬ 
erably more soda than those completely supplied with potash. The 
partial-potassium plants absorbed 0.73 as much potash and soda com¬ 
bined as the complete-potassium plants. 
EXPERIMENT VIII.—RICE WITH THREE-FOURTHS THE ROOTS LN 
POTASSIUM-FREE SOLUTION 
As the figures for potash absorbed by the partial-potassium plants 
differed somewhat from similar figures for nitrogen and phosphorus, it 
was important to observe the potash absorption of plants with more roots 
in the potassium-free solution. 
In regard to nutrient solutions, numbers of flasks per unit, and time 
the plants were grown in the different-sized flasks, this experiment was 
the same as the preceding. Solutions were changed 11 times during the 
experiment. Experimental data are given in Tables XVI and XVII. 
Table XVI .—Growth of rice in Experiment VIII 
Nutrient solution. 
Flask 
No. 
Weight of stalks 
and leaves. 
Number of 
roots. 
Average oven- 
dry weight 
of roots. 
Ratio 
of 
roots 
to 
tops. 
A-flasks. 
B-flasks. 
Green. 
Oven- 
dry. 
Av¬ 
erage 
oven- 
dry. 
A- 
flasks. 
B~ 
flasks. 
A- 
flasks. 
B- 
flasks. 
Potassium-free_ 
Do. 
Complete. 
Potassium-free... 
Complete. 
/ 1-8 
\ 9-16 
/1 7 “ 2 4 
\25-32 
/ 33 - 40 
\41-48 
Gm. 
46- 50 
47.66 
216.98 
220.27 
248.06 
249.01 
Gm. 
8.88 
9.08 
30.46 
3 i- 27 
33 * 8 o 
34 * 85 
Gm. 
} 8.98 
}30. 87 
} 34 * 33 
f 204 
\ 187 
/ 548 
l S60 
/ 572 
1 S 79 
213 
201 
254 
222 
262 
279 
Gm. 
} i -37 
} 6.38 
} 6.87 
Gm. 
i *47 
2.62 
3*13 
.316 
. 292 
. 291 
Table XVII .—Potash and soda absorbed by rice in Experiment VIII 
Potash (K2O). Soda (NasO). 
Flask No. 
In dry 
stalks 
and 
leaves. 
In dry roots. 
Ab¬ 
sorbed 
by 16 
plants. 
Ab¬ 
sorbed 
per 
gram 
of 
roots. 
In dry 
stalks 
and 
leaves. 
In dry roots. 
Present 
in 16 
plants. 
Ab¬ 
sorbed 
per 
gram 
of 
roots. 
A- 
flasks. 
B- 
1 flasks. 
A- 
flasks. 
B- 
flasks. 
1-16 
17-32 
33-48 
Per cent. 
0. 47 
4 * 15 
5 - 76 
Per cent. 
o* 33 
I. 06 
2.76 
i Per cent. 
\ O. 33 
i -95 
2. 76 
Gm. 
Gm. 
Per cent. 
X. 62 
• 7 2 
•35 
Per ct. 
1. 12 
i- 55 
• 65 
Per ct. 
I. 12 
I. OO 
• 65 
Gm. 
Gm. 
1. 3482 
2. 2018 
O. 515 
. 220 
O- 3473 
. 1851 
0. 0386 
. 0185 
Compared with the complete-potassium plants, the partial-potassium 
plants made slightly less growth, had the same ratio of roots to tops, 
absorbed 0.61 as much potassium, and absorbed 2.34 times as much 
potassium per gram of roots. The fact that partial-potassium plants 
