CHEMICAL AND BACTERIOLOGICAL STUDY OF WHEAT SOIL. 93 
Temperature and Moisture Conditions. 
The winter of 1921 was sufficiently wet to keep the soil 
more or less moist and sticky, the evaporation being at a 
minimum. A short wet spring was followed by a dry spell 
which gave the soil a good dessicating for two full months 
(November — December), and it has not really recovered 
from this till recently. We may note that maximum air 
temperatures averaged as follows :— 
June 44°; July 45°; August 46°; September 54°; October 61°; 
November 78°; December 84°: January 87°; February 91°. 
The rainfall averages were as follows:— 
1918, 18°55 inches; 1919, 15°16 inches; 1920, 22°43 inches; 
1921, 20°26 inches. 1921 to June 14th, 1081 points; June 
14— 30th, 39 points; July, 68 points; August, 209 points, 
well distributed in month; September, 312 points, 220 
points on 9th-10th September; October, 139 points, 95 points 
on 15th October; November, 10 points; December, 168 
points, all between 21 —26th December; January, 104 points 
80 points January 13th; February, 95 points, 70 points 
February 18th. 
Speaking generally the soil in June, July, August, Sep- 
tember was decidedly wet, in November, December, 
February, March decidedly dry, and in October and January 
intermediate and good for sampling. 
Soil Moisture. 
Soil moisture is dependent on three things—the amount 
of precipitation, the evaporation, and the treatment of the 
soil. These are all illustrated in the series of figures pre- 
sented in Table Il. and the graph which accompanies it 
(Fig. 1). It is seen that the total soil moisture has varied 
from very high to very low figures bordering on hygroscopic 
moisture. While the continued wet conditions prevailed 
from June to September, the various soil treatments made 
no difference in the totals, but the dry spell beginning in 
