44 
Journal of Agricultural Research 
Vol. XXIV, No. I 
DEMAND OF WHEAT PLANTS GROWN IN NUTRIENT SOLUTIONS FOR 
FRACTIONAL PARTS OF A DAY 
Seedlings were placed in culture pans containing a full nutrient solu¬ 
tion of a concentration of 125 parts per million each of nitrogen, potash, 
and phosphoric acid, as before described, and allowed to feed for frac¬ 
tional parts of the day At the end of the period allotted to each lot 
to remain in the nutrient solution, the disks with the seedlings were 
taken up and washed off and placed in distilled water for the remainder 
of the day. This process was repeated daily for 10 days, and the plants 
then analyzed for nitrogen, potash, and phosphoric acid. In Table II is 
5 fO /5 20 25 
a/IYS OLD 
Pig. a.—Graph illustrating the absorption of plant foods from nutrient solutions by wheat seedlings at 
different stages of growth. 
shown the number of hours each day the plant remained in the nutrient 
solution and the quantities of plant food absorbed. 
TABbP II.— Analyses of 100 wheat seedlings feeding fractional parts of the day for 10 days 
No. 
Hours per day in nutrient solution. 
Dry weight 
N 
K2O 
PaOs 
Gm, 
Gm, 
Gm. 
Gm. 
I 
Control 0.. 
5 * 32 
0. 0770 
0. 0318 
0. 0420 
2 
I.. 
5 -15 
. 0882 
. 0838 
. 0560 
3 
2 . 
5. 60 
. 1022 
. 1047 
.0750 
4 
4 . 
5. 20 
. 1120 
. 1366 
. 084a 
5 
6. 
5.80 
. 1540 
. 1862 
. 0960 
6 
8. 
5 - 30 
. 1680 
. 1940 
. 1040 
7 
12. 
5 - 73 
. 2072 
. 1858 
. 1060 
8 
24. 
6. 28 
•2352 
•2475 
. 1190 
# 
