* 
WHEAT PRODUCTION ON DRY LANDS. yA 
19/4 (WE (HE 19/17 1918 1H9 1920 192/ 
15) 
L/NO, ct hl 
40 A VEAACE 
AVERAGE 
“Seca ey, 
CU el NZ 
Se aan en oe 
FARLY FALL (ORY) PLOWING —---—— 
EASE FALL (WET) PLOWING —-—-—-— 
FAPRLY SPRING PLOW/NG 
Fic. — ee and average acre yields, in bushels, of winter wheat in varying numbers of years at Moro, 
Oreg ind, Wash., when grown after summer fallow for which the land had been plowed early in 
thef fall (¢ ny late in the fall Gey. and early in the spring, respectively. 
