1922] EATON—SULPHUR CONTENT OF SOILS 55 
harvest most of this corn was short and spindling. This is believed 
to be due not to the sulphur treatment but to poor seed. Leaving 
this series out of consideration, we see that flowers of sulphur and 
sodium sulphate containing the same amount of sulphur as 100 
pounds of gypsum, and gypsum at the rate of 500 pounds per 
acre gave marked increased dry weights over that of the control. 
The flowers of sulphur caused the greatest increase, 66.16 per cent, 
TABLE XI 
EFFECT OF DIFFERENT SULPHUR TREATMENTS ON GROWTH OF STOWELL’S EVERGREEN 
EET CORN IN GREENHOUSE 
: - Percentage 
Series Treatment Moisture mag vent D — — . or 
ees Control 87.62 266.7 33-E [ewes eee 
. ebee baie Na.SO, at rate tak 100 |b. 
gypsum per a 86.60 334.90 44.8 35-34 
OS Flowers of sulphur. at same| ‘ 
Ogura 369.6 55-0 66.16 
Beats Na,sO, ae amis ns 300 |b. 
gypsum per 85.00 164.3 24.7 $6.27 
Lge arse Flowers ts sulphur at same} 
rate a 84.95 239.5 32.8 — 0.90 
ae Dips Na,SO, ar sn ba 500 lb. 
gypsum per 85.44 222.5 32.4 — 2.11 
(EON aes whet of pale hue at same 
s6 85.93 739.2 33-4 0.90 
ene Gxpsum at rate of 500 lb. 
Hee uP eh pena 82.76 agt.7 46.9 41.69 
and gypsum was next with 41.6 per cent, sodium sulphate causing 
35-3 per cent increased dry weight. It is hard to say why flowers 
of sulphur and sodium sulphate in the larger amounts did not 
bring about increased growth. The dry weight of these series is 
about the same as the check. 
There has been work indicating injury to plants by the acid 
resulting from the oxidation of flowers of sulphur. Also some 
have claimed injury from the alkalinity developed in the soil by 
sodium salts. While this is a possibility, it is not emphasized. 
The acidity should have been taken care of by the calcium carbon- 
ate added to the sand. The literature shows that sulphur fertiliza- 
tion of cereals has not given consistent results, and as a rule not a 
very marked increased growth has been caused, so perhaps no 
particular significance should be attached to the fact that series 5, 
