882 
Journal of Agricultural Research 
Vol. V, No. 19 
The results of the greenhouse, bench, and pot tests with lettuce and 
tomatoes are recorded in Table III. It is evident that the lettuce plants 
took up boron in proportion to the amounts present in the soil. The 
control lettuce contained the lowest percentage of solids and indicated 
the presence of boron. A slight chlorosis of the lettuce plants grown in 
series 1 and 2 was seen, but no injury to the roots was observed. The 
results of the analyses of the upper and lower 6 inches of soil in the 
benches show an even distribution of the boron. 
Table III .—Boron in lettuce and tomatoes: Greenhouse bench and pot tests 
Series 
No. 
Treatment of manure per 8 bushels. 
Lettuce (entire 
plant). 
Soluble boron as boric acid 
in soil on which lettuce 
was grown. 
Dry 
matter. 
Boron as 
boric acid 
b&f). 
Upper 6 
inches of soil. 
Lower 6 
inches of soil. 
Per cent . 
Per cent. 
Per cent. 
Per cent . 
1 
0.75 pound of borax added. 
11. 6 
3 
1.25 pounds of borax added. 
10.0 
.00064 
.0022 
.0028 
3 
Control. 
9.0 
.00020 
Faint trace. 
Faint trace. 
4 
0.5 pound of borax added. 
.00036 
5 
0.62 pound of borax added. 
.00042 
6 
o-75 pound of borax added. 
7 
Control. 
.00015 
Series 
No. 
Treatment of manure per 8 
bushels. 
Tomatoes. 
Tops (dry basis). 
Fruit (fresh basis). 
Yield. 
Ash. 
Boron as 
boric acid 
(ash-free 
basis). 
Dry 
matter. 
Boron as 
boric acid 
(water and 
ash free 
basis). 
Num¬ 
ber. 
Weight. 
1 
9 
3 
4 
5 
6 
7 
0. 75 pound of borax added. 
1.25 pounds of borax added. 
Control. 
Per cent . 
12.98 
12.94 
10.10 
10.01 
10.77 
7.72 
7. 7 * 
Per cent. 
0.0089 
.0196 
.0009 
.015 
.016 
.0015 
Per cent. 
6- 55 
6.60 
6- 75 
8-10 
8. ox 
7 - 5 i 
8.00 
Per cent. 
Faint trace, 
do. 
123 
IOI 
120 
Ounces . 
157 , 
139K 
159 ^ 
0.5 pound of borax added. 
0.62 pound of borax added. 
0.75 pound of borax added. 
Control. 
0.0002 
.0004 
.0003 
Tomato plants 1, 2, and 3, Table III, were 6 months old at the time of 
analysis. The yield of fruit from three pots in each series, 1,2, and 3, 
showed no reduction in the case of the 0.75-pound borax application, but 
the 1.25-pound borax application reduced the yield. The dry matter of 
the control fruit, series 3, is higher than in series 1 or 2, and the ash of the 
control tops, series 3, is lower than the ash for the tops, series 1 and 2. 
The tomato plants, series 4, 5, 6, and 7, were younger and smaller than 
those of series 1, 2, and 3. In all the tomato plants (Table III) the tops 
contained practically all the boron, the fruit showing only traces. 
