52 WHEAT 



The land prepared by the listing method 

 yielded 21.1 bushels more wheat per acre in the 

 five years than the land which was plowed early 

 and otherwise given approved treatment. Late 

 plowing yielded 23.4 bushels less than early plow- 

 ing and 44.5 bushels less than early listing. The 

 fallowed area (cropped alternate years) gave 24.4 

 bushels less grain per acre in five years than con- 

 tinuous cropping with early plowing, and 45.5 

 bushels less than continuous cropping with early 

 listing. These results are not favorable to alter- 

 nate summer fallowing, and indicate that a less 

 frequent fallow would pay better. 



In Table IV are compared the yields secured 

 at the Oklahoma experiment station by plowing 

 at different dates in preparing the seed bed for 

 fall wheat. 



TABLE IV 



Date of plowing test in preparing seed bed for 

 wheat, Oklahoma experiment station (Bulletin 

 No. 65). 



Preparation Date of Plowing Yield per Acre 



Early July 19 31.3 bushels 



Medium Aug. 15 28.5 bushels 



Late.. ..Sept. 11 15.3 bushels 



THE SUMMER FALLOW 



In regions where the rainfall is not sufficient 

 to produce a paying crop each year by continuous 

 cropping, the system of summer fallowing with 

 "summer tillage " (keeping the soil mellow and 

 free from weeds) should be practiced every three 



