480 
IOWA ACADEMY OF SCIENCE Vol. XXIV, 1917 
The various culture solutions contain: (1) distilled water, 
(2) Shive’s solution without iron, (3) Shive’s solution having 
0.0010 gms. ferric phosphate per liter of the solution, (4) Shive’s 
solution having 0.0025 gms., (5) Shive’s solution having .0044 
Weight 
of crop 
in grams 
(36 Pl- 
ants.) 
7.0000 
6.0000 
5.0000 
4.0000 
3.0000 
.THE EFFE CT _0_F FER RIC PHOSPH ATE UPON JHE 
G ROWTH OF CANADA FIELD PE A SEEDLINGS . 
(TOTAL CROP j 
O 
* — I CM ^ VTN 
O O O O 
O O O O 
•w <D 
+3 > ; 
II) -HJ 
O to 
r-l rn t* lrs\0 
gms., (6) Shive’s solution having .0050 gms. per liter. For each 
culture 36 plants were used. The total crop in dry weight is 
given. No. 5 gives the greatest dry weight, producing 2.700 
grams. This then agrees with Shive ’s results. 
