te 2) ee Coe eee) 
a eee 
- 
WHEAT PRODUCTION ON DRY LANDS. 29 
a 79/0 (H/ (82 (H3 1H4F (HE (HE 19/7 (HB (HI 1920 192/ 
av, ; 
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| | as 
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| AVEPAGE | | | 
| | 
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45} | | | | l “<NY | | 
| | aba poaee |e Go, ep | 
10 | | 
15 
LIND, |\ WASH. | | 
| teal dae | 
YO. | | | | mee ke FB 
AVEPAGE + ! oe 
| | foo, / 
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roe 7 
2 2. 
SHALLOW ——-—----—— 
Fic. 16.—Annual and average acre yields, in bushels, of winter and spring wheats in varying numbers of 
years at Moro, Oreg., of spring wheat at Lind, Wash., and of winter wheat at Nephi, Utah, when grown 
after summer fallow for which the land had been plowed deep (10 inches) and shallow (5 inches). 
48605—23-——5 
