786 
Journal of Agricultural Research 
Vol. XXIV, No. 9 
Tabi^iJ II .—Weights of radish and soybean plants grown in Voluna and Dunkirk soils, 
with and without nutrients, MnSO^^ and CaCO^, duplicate pots 
Acid reaction of soil. 
Neutral reaction of soil. 
Crop. 
Soil. 
No 
treat¬ 
ment. 
Miner¬ 
als. 
Miner¬ 
als plus 
S parts 
per 
million 
Mn. 
Miner¬ 
als plus 
10 parts 
per 
million 
Mn. 
CaCOs. 
CaC03 
plus 
miner¬ 
als. 
CaCOs 
plus 
miner¬ 
als and 
5 parts 
per 
million 
Mn. 
CaCOa 
plus 
miner¬ 
als and 
10 parts 
per 
million 
Mn. 
CaCOa 
plus 
miner¬ 
als and 
50 parts 
per 
million 
Mn. 
Green weight of 
Gm. 
Gm. 
Gm. 
Gm. 
Gm. 
Gm. 
Gm. 
Gm. 
Gm. 
radish tops 
Volusia.... 
45-0 
212. s 
167. 5 
152.5 
52.5 
151.0 
178. 5 
194-0 
36.5 
and roots. 
Dunkirk.. 
92. 5 
240.5 
205.0 
lOI. 0 
95-0 
129.0 
185.0 
222. 5 
146. 5 
Dry weight of 
radish tops 
Volusia.... 
3-3 
12.4 
10.0 
9. 7 
3-4 
10. 7 
12.9 
13-4 
4. 2 
and roots. 
Dunkirk.. 
7-3 
15-8 
13-2 
8.8 
7.8 
7 - 7 
12.3 
13.8 
10.1 
Green weight of 
fVolusia.... 
38.8 
65-5 
i 50.0 
28.0 
42. 0 
42. 0 
60. s 
45 - 5 
II. 8 
soybeans. 
\Dunkirk.. 
30.3 
67.8 
4 i -*3 
20. 5 
27*5 
27 - S 
50. 8 
44-3 
48. 5 
Dry weight of 
/Volusia.... 
4.4 
12.5 
9. 6 
6.0 
9-3 
9. 9 
12. 5 
10. I 
2. 6 
soybeans. 
\Dunkirk.. 
6.9 
II. 9 
8.2 
3-6 
6. 2 
7-1 
9-5 
8.8 
10. 0 
JSXPi^RIMENTS WITH DUNKIRK CUAY UOAM SOU, 
Two series of experiments similar to those just described with the 
Volusia soil were conducted at the same time and under the same con¬ 
ditions with the Dunkirk clay loam soil. Apparently this soil is slightly 
more productive than the Volusia silt loam soil. It has an acid reaction 
and responds to applications of certain plant nutrients. 
A manganese determination on the Dunkirk soil gave 0.093 
this element. The amount of water-soluble manganese found was 
9.30 parts per million of the soil. 
The radish plants which were grown on the Dunkirk soil under the 
same conditions as those previously described on the Volusia soil were 
harvested on the same day and treated in like manner for the green 
and dry weights, which are given in Table II. 
No photographs were made of the plants grown in the Dunkirk soil; 
however, it will be seen from the green and dry weights of the plants, 
shown in Table II, that results somewhat comparable to those obtained 
with the Volusia soil were obtained under similar treatments with this 
soil. In series No. i the maximum yields occurred with the applications 
of mineral nutrients. Addition of manganese gave a diminution in 
yields as compared with the pots receiving mineral nutrients alone. 
In series No. 2, application of calcium carbonate to the soil of pots 
No. I and 2 affected the growth of the plants but little as compared 
with the corresponding pots in series No. i, in which the plants grew in 
acid soil. It thus appears that the application of calcium carbonate 
under these conditions had no effect as far as the growth of the plants 
was concerned. There is an increase which is apparently due to the 
applications of manganese in this series, as compared with the pots 
receiving mineral nutrients alone. This is in accord with the results 
obtained with applications of manganese to the neutralized Volusia soil. 
Equal quantities of the radish tops grown in duplicate pots were com¬ 
bined to make a composite sample for chemical analysis, the results of 
which are given in Table III. 
