. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fio. 3.—Diagram showing the daily maximum soil temperatures at a depth of half an inch, as re- corded by a soil thermograph with bulb barely covered, at Fargo, N. Dak., during June and July, 1920 (see Table 8). The black diamonds show times when severe canker occurred and the wMto diamonds times when canker was slight. JiJA/E juty .°>-'j^sit;^^i?!;^^^^Si?^'o;'^!^^;^^gxM'o»iov>s^»s^sig!t!Qigi^^^^i^sissi!;s^?;?SN§;. Fig. 4.—Diagram shov ing the daily maximum soil temperatures at a depth of half an inch, a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fio. 3.—Diagram showing the daily maximum soil temperatures at a depth of half an inch, as re- corded by a soil thermograph with bulb barely covered, at Fargo, N. Dak., during June and July, 1920 (see Table 8). The black diamonds show times when severe canker occurred and the wMto diamonds times when canker was slight. JiJA/E juty .°>-'j^sit;^^i?!;^^^^Si?^'o;'^!^^;^^gxM'o»iov>s^»s^sig!t!Qigi^^^^i^sissi!;s^?;?SN§;. Fig. 4.—Diagram shov ing the daily maximum soil temperatures at a depth of half an inch, as re- corded by a soil thermograph with bulb barely covered, at Fargo, N. Dak., during June and July, 1921 (see Table 8). of which was buried in the surface inch of soil. No plants were allowed to grow within 4 feet of the bulb. This thermograph re- corded the soil temperature at a depth of approximately half an Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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