10 



BULLETIN 268, U. S. DEPARTMENT OP AGRICULTURE. 



than in time of plowing, the plat under the heading "Late fall 

 plowed" having been plowed shallower than the one headed "Early 

 fall plowed." At Huntley the results seem to have favored shallow 

 plowing. The chief thing to be noted in the results from these 

 stations is the general lack of difference in the yields from methods 

 other than summer tillage. At the Judith Basin station summer 

 tillage has increased the yields from five to six bushels per acre. The 

 increase has not been sufficient to pay for the increased cost of 

 production by this method. Huntley has only two years' record. 

 During these years the average yield of winter wheat on summer- 

 tilled land has been over 40 bushels per acre as compared with yields 

 of about 30 bushels from other methods. This makes both the 

 yield and the profit from winter wheat after summer tillage at this 

 station greater than by any other method at any station. 



Table III. — Average yields and digest of cost of production per acre of winter wheat by 

 different methods of tillage at ten stations in the Great Plains area. 



Points covered. 



Early fall 

 plowed. 



Late fall 

 plowed. 



Disked. 



Listed. 



Subsoiled. 



Green 

 manured. 



Summer 

 tilled. 



Yields (bushels): 

 Judith Basin.. 



Huntley 



Belle Fourche. 



Scottsbluff 



North Platte... 



Akron 



Hays 



Garden City . . . 



Dalhart 



Amarillo 



Cost of production. 

 Profit or loss (— ): 



Judith Basin.. 



Huntley 



Belle Fourche. 



Scottsbluff 



North Platte.. 



Akron 



Hays 



Garden City... 



Dalhart 



Amarillo 



19.8 

 25.7 

 11.6 

 10.6 

 10.6 

 14.1 

 15.8 

 1.1 

 2.5 

 8.2 



20.2 



30.8 



8.4 



6.4 



22.5 

 29.5 



14.8 



19.8 



26.2 



9.7 



20.0 

 27.8 

 10.5 



23.5 

 32.4 



15.3 



13.3 



11.6 



1.2 



3.0 



7.2 



19.2 

 12.4 



1.5 







6.9 



14.7 

 19.4 

 1.5 

 2.5 

 6.4 



11.8 

 19.1 

 1.1 



16.7 

 14.2 



2.6 







7.7 



25.7 

 41.1 

 18.4 

 19.9 

 30.8 

 21.8 

 21.7 

 2.8 

 3.3 

 10.7 



$6.56 



7.30 

 11.43 

 1.56 



3.31 



4.50 



-5.79 



-4.81 



- .82 



$5.85 



8.29 



15.71 



.03 



- .63 



$4.75 



15.90 

 "5~67* 



8.31 

 12.79 

 1.24 



$7. 17 



6.83 



12.29 



.18 



$14.61 



8.07 

 '3.'90" 



3.46 



2.27 



-5.01 



-3.75 



- .81 



10.69 



3.93 



-3.70 



4.74 

 8.03 

 -4.50 

 -3.80 

 -1.07 



1.09 

 6.20 

 -6.40 



■ 2.92 

 - 4.67 

 -12. 79 



$11.50 



6.49 



17.27 



1.38 



2.43 



10.06 



3.76 



3.69 



-9.54 



-9.19 



-4.01 



At North Platte, data for a sufficient number of years to be of value 

 are available for only two methods, early fall plowing of land con- 

 tinuously cropped to winter wheat and summer tillage. The average 

 yield from summer tillage has been 30.8 bushels and from continuous 

 cropping only 10.6 bushels per acre. At Belle Fourche, Scottsbluff, 

 Akron, and Hays, early fall plowing has increased the yields over late 

 fall plowing. A still greater increase has been obtained by growing 



