56 BOTANICAL GAZETTE [SEPTEMBER 
6, and 7 show about the same dry weights as the check. The corn 
of all the series where sulphur fertilizers were used had a lower 
moisture content than the corn of the control series, the corn 
fertilized with gypsum having about 5 per cent less moisture than 
the control. 
Summary 
t. The Alabama, Maryland, and Oklahoma soils analyzed are 
low in sulphur, phosphorus, and organic matter; the phosphorus 
being not much greater in amount than the sulphur. The central 
states soils are better supplied, on the average, in all three respects, 
and decidedly better supplied with phosphorus than with sulphur. 
Some of these soils might be considered to have a fair amount of 
sulphur, phosphorus, and organic matter, while others are deficient 
in these respects. The Chicago soils have a fairly good content 
of phosphorus, and a rather high content of sulphur and organic 
matter. Although the sulphate sulphur content of the Chicago 
‘soils is high, this accounts for little of the total sulphur, most of it 
being due to the large amount of organic matter present. 
2. Most of the sulphur of soils is in organic form. There is a 
general correlation between the sulphur and organic matter content, 
soils of a high organic matter content having in general a high 
sulphur content. The surface soils are in general higher in sulphur 
than the subsoils. 
3. Judging from the results obtained and the work of other 
investigators, sulphur fertilization should prove quite generally 
beneficial on the Atlantic coast and the Gulf coast. The same 
thing may be true of the Pacific coast. Sulphur fertilizers are 
probably not as generally needed in the central states, many soils 
no doubt needing them, and many others not. Soil of a high 
organic matter content, such as the Chicago soils, may not need 
sulphur fertilizers except for high sulphur-using crops. In case 
the sulphate sulphur is as great in amount as it is in the Chicago 
soils, sulphur fertilizers might not be needed, even if the organic 
matter content is low.. Attempts are made, in the case of several 
soils, to correlate the sulphur, phosphorus, and organic matter 
content with the production of the soils, previous treatment, or 
other factors. 
