USB OF IRON IN NUTRIENT SOLUTION 
479 
were the same. On account of the presence of a fungus on the 
pea seeds, it was necessary to sterilize the seeds again by using 
mercuric chloride. In both the wheat and Canada field pea, the 
plants were allowed to grow for twenty-four days. The solu- 
Weight 
of total 
crop in 
grams 
(36 pl- 
ants] . 
THE 3JFP33T J3E JjgBHQBjj. _THE GROWTH. -O ff. m igAT 
SEEDL INGS „ 
(TOTAL CROP.) 
l-t 
• &I1 
C 
O O o 
^ H OJ . IA 
■ri O O O O 
OOOO 
•t5 3 
rH 
o * Z S T 
■xs c/i 
o 
r-\ a 
tit I i t 
CM r'A ■'t W0 
4 5 
Figure 96 
tions were changed every fifth day. At the end of that period, 
dry weight determinations were made of roots and tops. 
In the first series, the effect of varying amounts of ferric 
phosphate in the nutrient solution containing the three salts 
upon wheat, is presented in figure 95. 
