898 



THE SMALL GRAINS 



TABLE XI. RESULTS OF 2 YEARS' EXPERIMENTS AT MORO, 

 OREGON, SUBSTATION, ON TIME OF SPRING PLOWING FOR 

 SUMMER FALLOW FOR WINTER WHEAT 



Nevertheless it is not uncommon in eastern Oregon for 

 farmers to plow for summer fallow, without previous cul- 

 tivation, as late as June, though spring disking of the 

 stubble is now more practiced than formerly. 



426. Depth of plowing. The general attitude through- 

 out dry-farming areas is probably less favorable to deep 

 plowing than formerly. Many varying local conditions 

 affect the question, and there is need of further investi- 

 gation. 



Experiments in Utah are not convincingly favorable, 

 so far, for either deep or shallow plowing. It only ap- 

 pears that plowing should not usually be deeper than 10 

 inches, though certain results in light soils seem to favor 

 even greater depth. 



In Washington it is recommended to plow 6 to 8 inches 

 deep, whether in fall or spring, without basing the recom- 

 mendation on any particular experiments. 



In the experiments with green-manuring in California 

 previously discussed (411), plowing was done from 6 to 

 8 inches deep, and if weeds are bad, it is recommended to 



