WHEAT PRODUCTION ON DRY LANDS. A iy 
- TasLe 8.—Annual and average yields of Turkey winter wheat on ordinary fail-plowed 
fallow and on fallow with stubble variously treated, at Nephi, Utah, during the 6-year 
period from 1916 to 1921, inclusive. 
Yield per acre (bushels). 
Treatment. | 
1916 | 1917 | 1918 | 1919 | 1920 | 19a | “yer 
| } i se i 
Ordinary treatment, fall plowed............-. | - 200] 2i6| 17.4] 21.9; 255] 38.9 94.5 
mstraw plowed under.........-.-.-.---..--- Pe 222 20. 2 20:7). 28.7 39. 2 23. 8 
i Allstraw burned on plat.............-.-.-..- | 12.6 | 24.4 | 20. 5 21 FU... 29:0 40. 8 | 24. & 
_ Grain headed high: | | | 
Stubble plowed under....... h, Seah et oe ets Zoy00|), 18.2 23. 4 27.6 40.9 | 24.4 
Suc oie: Ge ee | 10.9 | 26. 1 | ilgeal 25.3 26.1 42.7 | 24.7 
a AVERAGE Saws i. 
ai == Fae 
Wi 
SPRING DISHED 
NOT DISKED ae es ae ee 
_ Fic. 13.—Annual and a grt acre yields, in bushels, of winter wheat in varying numbers of years at Moro, 
Oreg., and Lind, Wash., when grown after summer fallow for which the ground had been plowed in early 
summer with the stubble disked or not disked in early spring before plowing. 
48605—23 3 
ee 
