178 
Journal of Agricultural Research 
Vol. V, No. 4 
tumurtAi* -rurxnstvr WPBMEGDA'* THURSOAV ATV/DAr SATWaAr Si/^CAy' 
Fig. i.—T ypical charts of soil temperatures during the winter season: Records for week ending January 
is, 1914. A , Tillage with cover crop; D t grass land; C, straw mulch. 
Fig. a.—Typical charts of soil temperatures during the spring time: Records for week ending April 20, 
1914. A, Tillage; D, grass land; C, straw mulch. 
