242 
Journal of Agricultural Research 
Vol. V, No, 6 
was added to the complete fertilizer may have been due, as suggested 
for the previous crops, to a depressing effect of an excess of soluble salts. 
The favorable effects of calcium sulphate were most decided. 
Summarizing the results obtained with the leguminous plants, it may 
be stated that sulphates added to this soil were decidedly beneficial to 
the growth of the crops so far investigated. With the large-seeded bean 
and pea the effects are practically confined to the increased seed develop¬ 
ment. With the hay crop, however, the results are favorable to the 
growth of the straw portion of the plant. Calcium sulphate in general 
is considerably superior to sodium sulphate in its fertilizing action. In 
the case of clover both of these compounds, when added separately, 
increased the root development markedly. This would tend to increase 
the feeding power of the plant and may largely account for the increase 
of hay produced by their use. Sulphur alone depresses the general 
development of the plant, with the apparent exception of the clover roots. 
CRUCIFERAE 
Radishes (Raphanus sativus ).—The variety grown was Earliest Scarlet 
Turnip. Crop A followed two crops of rape on the same soil, both of 
which had been fertilized. Crop A was not fertilized. Crop B followed 
crop A on the same soil and was not fertilized. Crop C was also grown on 
the same soils, but was fertilized. Fifty days from planting crop A, 
alternate rows of the crop were harvested from one set of boxes for photo¬ 
graphing. These were dried and the weights recorded. The remaining 
plants were allowed to develop seed and the residue rejected. Plate 
XX, figure 2, is therefore the only available comparison covering the 
whole crop. The air-dried yields are given in Table IV. (See PI. XX, 
Table IV .—Average weights (in grams) of air-dried radish crops 
Treatment. 
Crop A. 
Crop B 
(whole 
plants). 
Crop C 
(whole 
plants). 
Average 
relative 
yields of 
whole 
plants for 
all crops. 
Tops. 
Roots. 
1. Control. 
0. 2 
2. 5 
19.9 
IO.3 
IOO 
2. Complete fertilizer. 
i- 5 
4.7 
36.5 
34-9 
236 
3. Complete fertilizer-f-sodium sulphate. 
1. 2 
4.7 
30-5 
48. O 
256 
4. Complete fertilizer 4 -calcium sulphate. 
i- 7 
7.0 
28. 4 
47. 6 
257 
5. Sodium sulphate only. 
5 
5 -o 
24-3 
10. 9 
126 
6 . Calcium sulphate only. 
x. 0 
4- 7 
21. 0 
3 
US 
7. Sulphur only. 
.8 
3- 7 
18. 2 
7 - 1 
60 
The results call for special comment. They show, especially where 
freshly fertilized (crop C), an unmistakable stimulus to growth by sul¬ 
phates. The effect is much more pronounced where the sulphates were 
applied alone* than where the complete-fertilizer ration was used. A 
