238 Journal of Agricultural Research voi. v, No. 6 
Boxes Nos. Gm* 
5-6. Complete fertilizer+sodium sulphate (Na 2 S 0 4 ). 12 
7-8. Complete fertilizer-!-calcium sulphate (CaS 0 4 ). 12 
9-10. Sodium sulphate (Na 2 S 0 4 ). 12 
11-12. Calcium sulphate (CaS 0 4 ). 12 
13-14. Sulphur (flowers). 5 
All of these materials were mixed with the soil at the beginning of the 
experiments, except the sodium nitrate. This was applied in solution 
in three separate portions as the plants developed. Sulphur was not 
included in the treatment of the earlier experiments. These amounts 
of fertilizer are equivalent to the following applications per acre to the 
surface 8 inches of soil, assumed to weigh 2,000,000 pounds: Tricaldum 
phosphate, calcium sulphate, and sodium sulphate, 1,600 pounds each; 
potassium chlorid, 600 pounds; sodium nitrate, 1,330 pounds; and 
sulphur, 665 pounds. 
While these applications may appear excessive as compared with 
field applications, nevertheless it should be remembered that in these 
experiments there was a thorough and complete mixing with the entire 
soil mass. In some cases the soil was limed. For this purpose 10 gm. 
of calcium carbonate were added to each box in the set. This was at the 
rate of 1,330 pounds per acre of a depth of 8 inches. 
Except in the case of large seeds, such as beans and peas, the seeds 
were sown liberally in four rows across the boxes and thinned when well 
developed to 16 plants per box. The larger seeds were germinated on 
paraffined mosquito netting stretched over distilled water, and transplanted 
to the soil when well developed. The usual care was taken to support the 
taller crops and suppress development of fungi and insects, but the use of 
any sulphur-containing sprays was of course carefully avoided. 
When the crops were mature, they were harvested and weighed while 
fresh. They were then dried quickly in steam-heated trays at about 
50? C. and allowed to stand exposed to the air from two to three weeks 
to become air-dried, in which condition they were finally weighed. 
The final comparative weights will be presented in the following tables, 
in which the weights given are averages obtained from duplicate boxes. 
In some cases, as indicated, the seed has been separated from the straw 
and weighed separately. Owing to the difficulty in recovering the roots 
from the soil, they have been neglected in most cases. 
EEGUMINOSAE 
Beans (Phaseolus vulgaris ).—The variety of beans grown was Davis 
White Wax. In crop A only 10 plants were grown per box. This 
crop followed two successive crops of clover on the same soil, the first 
crop of clover having been fertilized. Crop A was fertilized as usual, 
except that no sulphur was added to boxes 13 and 14. Crop B was not 
fertilized. Crop C was completely fertilized. Crop D was grown on a 
