[Vor. 7 
316 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Dg ae Corn 
n gra 
v 
C6 504 -EaP04 -FeP04 -Mg( 302) 2 
o 
4 
t a D 
. 
0 o v o a 
ei gh 2 fg & 2 
elt oS 9 y B d | & B 
o . q A t £4 E a x 2 
- A E co E X -4 d \ 
24 Fa . LÀ f Ay [2 oO 1 £4 E 
hod i d $ gt ag i $ 
PANE + ° D o - 0 [s] [^ o 
<+ [ o a” E) n o 1 . LY (8 
20] 2 xa A i 2 [ a 3 x od > ja 
S 37. Y E 2 $4 Y 4 s E 
t o 1 e 2 [4] 1 o o [] + » 
a 5 85 1 & E o " 2 a 
16 3 w B T X T E E 7T ER « : 
3 DS 8 o oa + E o a g d A 3 
n 1 8 8 a o a E Y 9 
zis > 8 3 2 2 7 3 
a D % a t) 
3 S 3 8 3 
d 3 $ p 
& 
3 
15 
Culture No 
l 2 3 4 5 6 7 8 9 10 11 12 13 14 
Fig. 2. Yield of corn in solutions of relatively insoluble salts. Continuous 
line is concentration 1 and broken line concentration 1 (see table 1). 
are not so striking as with wheat. Nor is it to be assumed that 
this relation will necessarily hold under all conditions. More- 
over, corn, notably resistant to Mg salts, does not exhibit some 
of the antagonistic effects evident in the case of wheat. No. 11 
showed pronounced chlorosis, followed, but to a somewhat less 
extent, by Nos. 7, 1, 12, 10, 13, and 14. Nos. 2-6, 8, and 15 
were normal in appearance, while No. 9 was intensely green. 
Difference in “concentration” in the first series was wholly 
in respect to a variation in the quantity of the relatively in- 
soluble salts; but inasmuch as a considerable amount of the 
insoluble residue remained in each culture at the close of the 
experiment it would seem improbable that any difference in 
the amount of the solid phase would affect the yields. Accord- 
ingly, in the series carried out at Carmel, table 11 and fig. 3, it 
will be seen that the following are practically the only ways in 
which the “concentrations” are varied: (1) in column “11” 
the quantity of KNO; is one-half the amount used in column “1, 
and (2) in column “111,” while the amount of nitrate remains 
)» 
