Feb. 7,1916 
Boron 
885 
Table; VII .—Percentage of boron and ash in radishes, string beans , cow peas, peas , and 
soil: Plot tests at Orlando , Fla . 
Se¬ 
ries 
No. 
Treatment of manure per 8 
bushels. 
Radishes (dry basis). 
String beans (dry basis). 
Tops. 
Roots. 
Tops. 
Roots. 
Ash. 
Boron 
as 
boric 
acid 
(ash¬ 
free 
basis). 
Ash. 
Boron 
as 
boric 
acid 
(ash¬ 
free 
basis). 
Ash. 
Boron 
as 
boric 
acid 
(ash¬ 
free 
basis). 
Ash. 
Boron 
as 
boric 
acid 
(ash¬ 
free 
basis). 
1 
2 
3 
0.7s pound of borax added. 
1.25 pounds of borax added. 
Control. 
34-44 
49-49 
45 - 25 
0.162 
. 226 
.018 
50.08 
51* 12 
45-04 
0.039 
. 087 
.010 
i 7 - 56 
22.80 
0.086 
. 080 
.011 
22.98 
14.89 
0. on 
■ 015 
. 007 
Cowpeas (dry basis). 
Peas 
(entire 
Soluble 
Se¬ 
Treatment of manure per 8 bushels. 
Tops. 
Roots. 
plant, dry 
basis). 
boron as 
boric acid 
found in 
ries 
No. 
Ash. 
Boron 
as boric 
acid 
(ash-free 
basis). 
Ash. 
Boron 
as boric 
acid 
(ash-free 
basis). 
Boron 
as boric 
acid. 
sample 
of soil 
.3 to 4 
inches 
deep. 
0 75 pound of borax added.. 
29.49 
%■*. 22 
0.162 
« 140 
-7 e, 1 r 
0. 222 
0. 212 
0.0006 
2 
1.25 pounds of borax added. . 
Oj 1 
45-68 
Control. 
JO- 
20. 18 
. 024 
. 029 
* 024 
* 0003 
3 
In Table VII the boron content of radish (Raphanus sativus ), string- 
bean, cowpea, and pea plants, grown on borax and control plots at 
Orlando, Fla., is given. An appreciable amount of soluble boron was 
found in the soil samples from all three plots. The radish plants con¬ 
tained a large amount of boron in the tops, as well as an appreciable 
quantity in the roots. The string beans did not absorb as much boron 
as the radishes, but contained a large percentage of the absorbed boron 
in the tops. The cowpeas absorbed large amounts of boron, more being 
found in the roots than in the tops. The pea plants also absorbed boron 
in great quantities. All the control plants contained boron to a marked 
degree, which is not surprising, as 0.0003 per cent of soluble boron was 
found in the control soil sample examined at the close of the test. 
As there was little rain at Orlando while these tests were being con¬ 
ducted, and as relatively large quantities of soluble boron were found in 
the samples of soil tested, it is not surprising that the plants absorbed 
large amounts of boron. 
DISCUSSION OF EXPERIMENTAL, WORK 
It apparently made little difference in the quantities of boron absorbed 
by the various plants whether it was added to the manure used on the 
soil in the form of calcined colemanite or as borax. The addition of 
