Feb. 7,1916 
Boron 
881 
action of the boron alone and the benefit derived from adding lime. 
The tops of the tomatoes contained rather a large quantity of boron, 
the roots and fruit but traces. More boron was absorbed by the tomato 
plants when borax was added than with the addition of calcined cole- 
manite. The addition of lime with the borax retarded the absorption 
of boron. The lowest percentage of dry matter was found in the tomatoes 
grown on the soil where borax alone was added. The tops of the control 
plants contained the least ash. 
TabtF II .—Boron in tomatoes and cowpeas: Greenhouse pot tests 
Tomatoes. 
Se¬ 
ries 
No. 
Treatment of manure per 8 
bushels. 
Tops. 
Roots. 
Fruit. 
Yield of fruit. 
Ash. 
Boron 
as boric 
acid 
(ash-free 
basis). 
Ash. 
Boron 
as boric 
acid 
(ash-free 
basis). 
Dry- 
matter. 
Boron 
as boric 
acid 
(ash-free 
basis). 
Num¬ 
ber. 
Weight. 
Per ct . 
Per ct. 
Per ct. 
Per ct. 
Per ct. 
Per cent. 
Ounces. 
X 
0.75 pound of calcined 
13 -13 
0.0054 
9 - 59 
Trace. 
6.04 
Faint trace. 
17 
37 - 25 
colemanite added. 
• 
x.5 pounds of calcined cole- 
14-44 
.0107 
10.86 
.. .do... 
5-94 
.do. 
x6 
3 i *5 
manite added. 
3 
i pound of borax added. 
11.87 
.0x46 
28.80 
None.. 
4.72 
.do. 
10 
10 
4 
x pound of borax and x ounce 
13 - 95 
• 0123 
I 3-76 
... do-... 
15 
33 
of lime added. 
5 
x pound of borax and 3 ounces 
12.15 
.0072 
10.66 
.. .do... 
5-26 
Faint trace. 
17 
34 
of lime added. 
6 
1 pound of borax and 9 ounces 
12.00 
Trace. 
19-43 
..do... 
5-85 
.do. 
18 
35 
of lime added. 
7 
Control... 
xo. 12 
. ..do... 
21.88 
Trace, 
5-92 
.do. 
23 
40.25 
Cowpeas (dry basis). 
Se¬ 
Tops. 
Roots. 
Fruit. 
ries 
No. 
Treatment of manure per 8 bushels. 
Boron as 
Boron as 
Boron as 
Ash. 
boric add 
(ash-free 
Ash. 
boric acid 
(ash-free 
Ash. 
boric add 
(ash-free 
basis). 
basis). 
basis). 
X 
0.75 pound of calcined colemanite 
Per cent . 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
added. 
9.27 
0.0339 
18. 52 
0.0033 
3.68 
0.0135 
2 
1.5 pounds of calcined colemanite 
added.■. 
0 * 2K 
.0287 
.0242 
27*04 
2d. dO 
Trace. 
3 . OO 
\0 r. 
O f 
W 1 - 
O C 
3 
1 pound of borax added. 
8 .54 
None. 
3*36 
4 
1 pound of borax and 1 ounce of lime 
**T 
added. 
10.96 
.0115 
10. ox 
_do. 
4.12 
.0222 
5 
x pound of borax and 3 ounces of 
lime added. 
10.08 
.0237 
17.44 
_do. 
3.01 
.0097 
6 
1 pound of borax and 9 ounces of 
lime added. 
11.36 
7 - 84 
.0302 
.0068 
20.64 
22. 58 
3-40 
3-20 
. 0029 
. OOQ 4 
7 
Control. 
None. 
The tops of the cowpeas contained the most boron and the roots the 
least, the fruit being intermediate. The addition of lime with the borax 
did not influence the total amount of boron absorbed by the plants. 
The control cowpeas contained larger amounts of boron than the tomato 
control plants. The tops of the control cowpeas contained the least ash. 
