Jan, 22, 1917 
Effect of Fertilizers on Oranges 
135 
EFFECT OF SOIL DIFFERENCES 
Since the most evident contrast in soil type met with in these experi¬ 
ments occurs in the extreme upper and lower tiers of plots, where the fer¬ 
tilizer treatments have been duplicated, it is of interest to compare the 
composition of the fruit in the two cases. Such a comparison should 
throw some light on the question of whether or not the variability of the 
soil was great enough to vitiate the results in general. As already stated, 
the soil in the upper tier of plots is lighter in character than that in the 
lower tier. 
The data for the upper and lower tiers of plots have been assembled 
in Table VIII. 
Table VIII .—Composition of oranges from light and heavy soil 
NAVEL ORANGES, 1914 
Light soil. 
Heavy soil. 
Plot. 0 
Specific 
gravity. 
Juice. 
Sugar. 
Acid. 
Nitro¬ 
gen. 
Plot.® 
Specific 
gravity. 
Juice. 
Sugar. 
Acid. 
Nitro¬ 
gen. 
A . 
B. 
C. 
D. 
E. 
Average.. 
0.90 
.91 
.91 
.92 
.90 
P.ct. 
47-3 
47 -S 
47.1 
45 -S 
46.9 
P. ct. 
9.06 
9-39 
9. 28 
9 - 65 
9.69 
P.ct: 
1.11 
1.06 
1.09 
1.08 
1.01 
P.ct. 
0.087 
.072 
.088 
. 076 
.082 
P. 
Q . 
R . 
S . 
T. 
Average. . 
0.90 
.89 
.89 
.88 
.88 
P.ct. 
47.8 
44.8 
45-9 
44.6 
45-8 
P. ct. 
9. 14 
9 -os 
9.04 
8.86 
9-47 
P. ct. 
i-13 
i-13 
1.12 
1.13 
1.12 
P.ct. 
0.082 
. 102 
.081 
.102 
.082 
.91 
46.9 
9 - 41 
1.07 
.081 
.89 
45.8 
9.11 
i-13 
.090 
NAVEL ORANGES, 1915 
A . 
0.88 
4 i *7 
9.46 
0.98 
0.126 
P. 
0.89 
.88 
.90 
.88 
.90 
41.4 
41.1 
43-9 
40. 7 
43-6 
10.47 
9. 99 
9.92 
10.05 
10. 80 
0.98 
1.00 
•97 
•99 
.92 
0 .097 
.124 
.081 
.117 
.087 
B. 
Q. 
C ...... 
.89 
.91 
.90 
40.4 
44-4 
42.9 
10. II 
10.92 
10.82 
.98. 
■97 
.90 
.130 
.086 
•093 
R. 
D . 
s...:. 
B. 
T. 
Average.. 
Average.. 
' .90 
42.4 
10-33 
.96 
.109 
.89 
42.1 
10. 25 
•97 
. 101 
VALENCIA ORANGES, 1914 
T 
A. 
0.93 
53-9 
8.07 
1.01 
O. 124 
B.•. 
.92 
S 3 -o 
8.89 
1.02 
.088 
c. 
.92 
52-5 
8. 68 
•97 
. 116 
D.. 
■94 
S 3-3 
9.04 
.98 
.089 
E. 
.91 
52-5 
8-66 
.92 
•095 
Average.. 
.92 
53 -o 
8.67 
.98 
. 102 
> 
0.90 
50.0 
7-99 
0.94 
0. no 
l . 
.89 
47 -S 
7-84 
1.00 
.130 
i.. 
.90 
49.4 
8.22 
.96 
.107 
.89 
47-4 
7.84 
•97 
.124 
.90 
49-1 
8- 26 
•99 
. 104 
Average.. 
.90 
48.7 
8.03 
•97 
• ns 
VALENCIA ORANGES, 1915 
A. 
B. 
C. 
D. 
E. 
Average.. 
0.92 
S 3 -1 
7 - 93 
0. 76 
0.141 
P. 
0.92 
50.8 
9.07 
0. 71 
0.114 
* .92 
55-9 
8. 58 
•65 
. 071 
Q. 
.91 
48-5 
9.01 
.81 
. 146 
.92 
53-6 
8-37 
.66 
.128 
R. 
.92 
53-8 
8 - 94 
.67 
.099 
• 95 
55-3 
9.09 
. 60 
.080 
S. 
.91 
49.0 
9. 26 
.78 
.141 
•93 
53-3 
9.16 
.64 
. 108 
T... 
•94 
53*6 
10.00 
•65 
• i °3 
•93 i 
54-2 
8.63 
.66 
. 106 
Average.. 
.92 
Si-1 i 
9. 26 
• 72 
. 121 
° The fertilizers applied to the different plots are given in Table X. 
