TIME OF PLOWING SMALL-GRAIN STUBBLE. 5 



leaves the surface somewhat rough and tends to pack the furrow slice 

 down on weeds or trash plowed under. The spring plowing for small 

 grains has been done as early as weather conditions would permit and 

 packed in the same manner as the fall plowing. Plowing for corn has 

 been deferred until planting time. 



Table II presents the results with spring wheat on fall-plowed and 

 spring-plowed oat stubble in two similar 3-year rotations, Nos. 4 

 and 9, and from both the fall and the spring plowing of land con- 

 tinuously cropped to wheat. In this latter comparison the fall plow- 

 ing is deeper than the spring plowing, but this difference has not 

 apparently affected the results sufficiently to prevent their com- 

 parison in a study of the effects of time of plowing. 



Table II. — Annual and average yields of spring wheat from fall-plowed and spring- 

 plowed plats at the Akron Field Station, 1909 to 1914, inclusive. 





Rota- 

 tion 

 No. 



Yield per acre of grain (bushels). 



Treatment. 



1909 



1910 



1911 



1912 



1913 



1914 



Aver- 

 age. 



Fall plowed: 



4 

 B 



10.6 

 10.3 



4.6 

 6.2 



6.7 

 4.1 



18.8 

 20.7 



0.3 



.8 



13.8 

 12.2 



9.1 



"Wheat stubble 



9.1 









10.5 



5.4 



5.4 



19.8 



.6 



13.0 



9.1 





9 



A 





Spring plowed: 



abble 



14.3 

 14.3 



6.3 

 11.3 



.2 

 2.9 



20.3 

 21.3 



1.0 



4.8 



21.2 

 22.2 



10.6 





12.8 







Average for spring-plowed plats. 

 Gain or loss of spring-plowed 



14.3 

 3.8 



8.8 

 3.4 



1.6 



-3.S 



20.8 

 1.0 



2.9 

 2.3 



21.7 



8.7 



11.7 

 2.6 









Table III presents in similar form the yields of oats from fall-plowed 

 wheat stubble in rotations Nos. 1 and 3, from spring-plowed wheat 

 stubble in rotation No. 2, and from both the fall and the spring 

 plowing of land continuously cropped to oats. 



:.e III. — Annual and average yields of oats from fall-plowed and spring-plowed 

 plats at the Akron Field Station, 1909 to 1914, inclusive. 



■ merit. 



Rota- 



Yield per acre of grain (bushels). 



1909 



1910 



1911 



1912 



L913 



1914 



Average. 





1 



3 

 B 



15.6 



II. 1 



16 9 

 L3.0 

 8.0 



L5.9 



66. s 

 40.0 

 16.9 



7.2 



4.7 



,6 



35.9 

 36.6 

 36.9 



25. 8 





10 8 







"ii i 











12.3 



14. 8 



47.9 



4.2 



86. 5 



22.4 





A 





• plowed: 

 Wheal tubble 



is.:-, 



•!. 1 



L4.8 



10.9 



1.7 

 1.3 



16.9 

 41.9 



L6.6 

 6, 6 



■I 7. 5 

 39.4 



24.3 



ile 



20.7 







Qafn or lo ol prini -plowed 



19.7 

 L.3 



12.9 



3.0 



-11. K 



44.4 

 -3. 6 



11.6 



7.4 



43.4 

 6. 9 



22. 5 

 .1 









