WHEAT PRODUCTION ON DRY LANDS. 35 
_ There apparently was no advantage in using either the subsurface 
_ or surface packers at Moro. 
ees SE/F /9/5 19/6 SH/7 (HG 19/9 1920 1927 
NO PACKING 
SUB-SUAIACE FACKED —_—---- = 
SUAFACE KFACAED =—-—-=—-—: _ 
Fic. 18.—Annual and average 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 land had been plowed in late 
spring and either not packed or packed with a subsurface or surface packer after plowing. 
RESULTS AT LIND. 
_ At Lind the experiments included the use of the subsurface packer 
on all dates of spring and summer plowing. The results are given in 
Table 19, and are shown graphically in Figures 17, 18, and 19. 
The data in Table 19 indicate that, in contrast to the results at 
Moro, there were certain beneficial effects in using the packer at 
