Oct. 25, 1915 
Soil Temperatures 
179 
Fig. 3. —Typical charts of soil temperatures during the summer months: Records for week ending June 
13, 1914. A , Tillage; D, grass land; C, straw mulch. 
Fig. 4.—Typical charts of soil temperatures during the fall of the year. Records for week ending Novem¬ 
ber 2, 1914. A, Tillage with cover crop; D, grass land; C, straw mulch. 
