Mar. 1, 1925 
Effect of Sulphur and Gypsum on Palouse Silt Loam 453 
Table I.— Amount of rainfall, and sul¬ 
phur in rain and snow from November 
29, 1922, to June 18, 1928 
Date 
Amount 
of rain¬ 
fall 
Pounds per acre 
Sulphur 
Calcu¬ 
lated as 
S0 3 
sulphur 
1922. No. and Dec. 
1923. Jan.. 
Inches 
4.18 
3.75 
.95 
.54 
.88 
1.30 
3. 25 
0.83 
1.11 
.54 
.48 
.29 
.70 
1.87 
2.77 
1.35 
1.20 
.72 
1.75 
Feb... 
Mar-. 
Apr_ 
May. 
June_ 
Total. 
14.85 
3.95 
9.66 
The total amount of rainfall for the 
eight months was 14.85 inches, which 
indicates that the rainy season for 
1922 to 1923 was not quite up to the 
average. For this reason the results 
obtained from this study are probably 
all the more valuable. The total 
amount of sulphur added to an acre 
of soil in the rain and snow for this 
period (exclusive of the June sample 
which was contaminated by birds) was 
3.95 lbs. If 2 lbs. of sulphur is al- 
allowed for the months of June and 
October, which seems to be a fair esti¬ 
mate, judging from the other analyses 
this would make a total of about 6 lbs. 
of sulphur per acre reaching the soil 
through the annual precipitation. This 
quantity is very much below that re¬ 
ported by some other investigators. 
The writer 3 found an average of about 
15 lbs. of sulphur added to an acre of 
soil in Iowa by the rain water. Other 
analyses of the rain falling in cities and 
towns vary from 25 to over 300 lbs. 
of sulphur per acre annually. The 
results obtained for the Palouse coun¬ 
try are probably low, because this sec¬ 
tion is far removed from the great 
coal-consuming centers which furnish 
the atmosphere with the greater por¬ 
tion of its sulphur. 
Table II shows the amount of drain¬ 
age water and leachings collected from 
the pots in both experiments. 
Table II.— Amount of drainage and leachings 
Pot 
Treatment (pounds per acre) 
Experiment 1 (field pots) 
Experi¬ 
ment 2 
(green¬ 
house 
No 
Decem¬ 
ber 
January 
and 
February 
March 
and 
June 
Total 
for five 
months 
pots), 
total 
leach¬ 
ings 
1 j 
Control. 
C.c. 
1,930 
C.c. 
5,835 
C.c. 
2,655 
C.c. 
10,420 
C.c. 
6,555 
2 ! 
j.do...... 
1,869 
4,515 
2,640 
9,024 
6,945 
Average..... 
; 
1,900 
5,175 
2,648 
9,722 
6, 750 
3 
Uninoculated sulphur 186. 
2,329 
6,965 
3,215 1 
12, 509 
7,300 
4 
.do. 
2,245 
5,200 
2,875 
10,320 
6,460 
Average....i 
2,287 
6,083 
3,045 
11,415 
6,880 
5 
Inoculated sulphur 189... 
2,305 
5,960 
3,210 1 
11,475 
7,090 
6 
.do...... 
* 1,904 
5,250 
2,870 j 
10,024 
6,705 
Average.... 
2,105 
5,605 
3,040 
10,750 
6,898 
7 
Uninoculated sulphur 1000__ 
2,379 
6,690 
3,180 
12,249 
6,725 
8 
_do.... 
2,057 
4,095 
2,660 
8,812 
6,610 
Average..... 
2,218 
5,393 
2,920 
10,531 
6,668 
9 
Inoculated sulphur 1015... 
2,269 
5,380 
2,960 
10,609 
! 6,430 
10 
.do...... 
2,107 
4,937 
2,765 
9,809 
j 6,065 
Average... 
2,188 
5,159 
2,863 
10,209 
| 6,248 
11 
Gypsum 1000 .. ._! 
l 2,289 
5, 515 
5,167 
2,800 
10,604 
6,580 
12 
_do.....1 
2,127 
2,725 
10,019 
6,630 
Average. 
2,208 
5,341 
2,763 
10,312 
6,605 
* Erdman, L. W. the sulphur content of rainwater. Soil Sci. 14: 363-367. 1922. 
