Apr. W, 1924 
Orange Trees and Nutrient Solution Concentrations 
279 
ratio of water transpired to unit of dry weight was least in case of the largest 
plants (as is usually the case), and greatest in the case of the smallest plants. 
Table III shows data obtained from the analysis of the leaves and stems of the 
seedlings just described. The leaves showed an increasing percentage of ash, 
with increasing concentration of culture solution. The percentage of calcium 
in the ash of the leaves showed a steady decline in the lowest four concentrations, 
while the percentages of potassium showed a rise in the higher concentrations. 
On the other hand, the percentage of sulphate and phosphate was lowest in the 
cultures receiving the three highest concentrations. 
The ash of the stems increased with increasing concentrations of culture 
solution, but the percentage of ions in the ash showed no pronounced changes 
corresponding with increasing concentrations of culture solution. The last 
column in Table III shows the composition of entire seedlings from the same 
source and of the same age as those used in installing the cultures. Attention 
should be paid to their content of sodium, potassium, and phosphoric acid. 
Computation of the actual amounts of sodium and phosphoric acid in the dry 
matter of the seedlings shows that the stems have lost rather than gained in 
these ions during the course of growth in 122 days. 
Table II.-— African sour orange seedlings in various concentrations of nutrient 
solution, (Each lot consisted of 64 seedlings having an initial green'weight of 
21,4 QW' and dry weight of 8.62 gm.) 
CONCENTRATION OF NUTRIENT SOLUTION 
.250 
. 50 C 
1 .0C 
1.5 C 
2.0 C 
2.5C 
Tops.... 
Grams 
37 
Grams 
44 
Grams 
66 
Grams 
92 
Grams 
84 
Grams 
78 
Green weight__ 
Roots___ 
45 
39 
51 
58 
52 
55 
Entire plants.... 
82 
83 
117 
150 
136 
133 
f Leaves 1_ 
6.84 
8.76 
13.39 
19.09 
16.80 
14.07 
Stems___ 
4.45 
4.03 
5.80 
8.10 
6.36 
6 . 50 
Dry weight ___ 
Roots_ ___ 
8.91 
7.79 
10.47 
11.87 
10.60 
11.00 
Tops... 
11.29 
12.79 
19.19 
27.19 
23.16 
20.57 
Entire plants___ 
20.20 
20.58 
29,66 
39.06 
33.76 
31.57 
fTops..:... 
0.869 
1.072 
1.759 
2.629 
2.656 
2.553 
Weight of ash... 
Roots... 
0.756 
0.696 
1.055 
1.224 
1.228 
1.216 
Entire plants.. 
1.625 
1.768 
2.814 
3.853 
3.884 
3.769 
Water transpired per 
gram of dry weight. 
/Tops..:.... 
893 
826 
673 
564 
603 
633 
\Entire plant .. 
499 
514 
435 
393 
414 
412 
Table III.— Composition of the ash of the leaves and stems of orange seedlings 
from solutions of various concentrations 
Leaves 
Stem 
Entire 
seed¬ 
Concentration of 
nutrient solutions 
$■ 
0.25 C 
0.50 C 
1.0 C 
1.5 C 
2.0 C 
2.5 C 
0.25 C 
0.50 C 
1.0 C 
1.5 C 
2.0C 
2.5 C 
lings 
from 
germ¬ 
inat¬ 
ing 
box 
Percentage of ash in 
8.31 
10.79 
the dry matter.... 
Percentage of water 
soluble inorganic 
8. 50 
8.68 
9.59 
10.24 
12.11 
13.16 
6.49 
7.73 
8.19 
9.77 
5.58 
matter__ 
Constituents as a 
percentage of the 
ash: 
41.03 
46.66 
51.39 
51.99 
60.18 
57.68 
59.19 
61.11 
62.09 
66.67 
67.49 
69.07 
Na.. 
3.05 
3.88 
5.10 
6.31 
7.70 
6.60 
4.54 
6.17 
5.07 
6.11 
6.68 
_ 
13.29 
K.. 
15.39 
20.77 
23.35 
23.66 
28.02 
26.87 
25.94 
27.75 
27.93 
30.11 
29.07 
27.73 
Ca. 
Mg . 
17.62 
3.12 
14.55 
2.25 
11.13 
3.90 
7.46 
7.77 
8.85 
13.90 
3.40 
13.52 
3.92 
13.01 
2.88 
11.61 
3.08 
9.43 
4.50 
10.96 
3.91 
6.32 
3.51 
Cl.. 
.46 
.71 
.78 
.53 
1.10 
.37 
1.91 
2.31 
2.74 
1.90 
2.90 
1.31 
1.07 
SO 4 ... 
7.66 
6.31 
6.24 
5.30 
4.97 
5.14 
6.31 
5.88 
6.23 
4.74 
5.10 
5.41 
5. 45 
PO 4 .- 
8.36 
7.75 
8.41 
5.66 
5.31 
5.66 
13.59 
10.40 
10.69 
11.16 
9.20 
9.21 
26.97 
