Soil Temperatures 



179 



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Fig. 3. — T>-pical charts of soil temperatures during the summer months: Records for week ending June 

 13, 1914. A, Tillage; D, grass land; C, straw mulch. 



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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. 



